The team find unexpected connections between the death of a former US ambassador in a plane crash and the apparent suicide of a successful businessman.

The team discover a connection between the plane crash and a sinister online forum. Meanwhile, Matt is grieving for his friend, putting his relationship with Nikki under strain.

When the body of a missing teenager is found in a field near his village, Nikki and the Lyell team must determine whether the killer is a stranger or a local.

Investigating the murder of missing teenager Jason Forbes, Nikki and the Lyell team are pressured by police officers who are keen to secure a conviction.

The body of a woman is found on railway tracks in London, badly damaged from electrical burns. On the mortuary slab, the woman’s recent and historic injuries suggest years of abuse, likely within the home. It’s a difficult post-mortem for Nikki, as she is troubled by memories from her childhood.

When the team's search for Jenny's killer hits a wall, her friends at the women's refuge seek answers. Meanwhile, Thomas makes some friends in high places.

When a skeleton is found in concrete, the Lyell team must investigate a suspicious death dating back 20 years.

The Lyell team identify the concrete-encased remains as those of Derek Marshall, survived by his wife Sue and sister Ann. Clarissa traces payments to a cryogenics facility, leading to the discovery of another suspicious death. Lacking any proper documentation, the coroner orders a post-mortem into the cryogenically frozen body. How did they die, and why was the decision made to freeze them?

Thomas performs a post-mortem on a soldier who died in military training. His investigation takes a turn when he discovers traces of a possible nerve agent.

Jack is rushed to hospital after collapsing at the scene of a car crash. As he fights for his life, the team must identify the poison to save their friend.

Fresh from her trip to the States, Nikki and the Lyell unit are called in to investigate an attack against a trans man. When two further attacks are reported, one leaving a potential witness, it becomes clear that the team is facing an outbreak of violence against the trans community.

A mistake has been made during the course of the investigation, and Thomas is targeted as a scapegoat. As frustration grows between the Lyell and the acting DCI, can Thomas rally the team to gather crucial evidence to find the killer before they strike again?

With new drugs hitting the streets, a head teacher confronts the dealers preying on his community, as the team deal with a surge in drug-related crime.

When tragedy strikes close to home, it puts head teacher Noah Taylor on a collision course with the criminals responsible. Can the Lyell team help him stop the cycle of violence?

A collection of dismembered body parts, covered in intricate Japanese tattoos, have been found in a Brighton waste dump. The team are called in to painstakingly piece them together and they search for clues to lead them to the killer. Outside of the lab, Nikki has some news she desperately wants to share with Matt.

The team struggle to find the final piece of the puzzle left behind by the murders in Brighton. At home, Nikki and Matt discuss their future together.

A car-bomb attack in a quiet suburban street brings back unwelcome memories for Jack, when evidence points to the involvement of a Northern Irish terror group, long thought inactive. As the family of the victim seek their own form of justice, Jack calls an old friend to help them find those responsible and stop the act of revenge from escalating.

During the team’s search for the killer, Jack works alongside an old friend from Northern Ireland, a fearless journalist who has dedicated her life to exposing the suspected organisation. As the team investigate further, they realise they have uncovered a complex conflict sustained by ties of loyalty, family and retribution.

Nikki is humiliated in court when a barrister accuses her of making a serious error in the case of a policeman who may or may not have been murdered. Meanwhile the team investigates the death of a medical researcher found in a canal with mysterious puncture marks on his body.

When Thomas sides against her findings on a controversial case, Nikki suspects foul play and takes steps to prove her theory. Jack and Clarissa follow a forensic trail connecting a dead researcher with a billionaire scientist and a secret testing programme.

Nikki struggles to come to terms with life back home and seeks out fellow pathologist Sally Vaughan for support, only to learn she is nowhere to be found. National Crime Agency investigator Guy Bernhardt asks Nikki to help him by employing pathologist David Cannon, the chief suspect in Sally's disappearance. As Jack, Clarissa and Thomas share concerns about Nikki's wellbeing, a body found in a reservoir is linked to a murder case from 16 years previously. Return of the crime drama, starring Emilia Fox, with Julian Rhind-Tutt and Alex Macqueen.

Nikki's suspicions about David Cannon are roused further when she discovers blood in the boot of his car an with Thomas's support she takes samples to process. Does it belong to Sally Vaughn? Meanwhile, the uncovering of the body from the 16-year-old murder shines the spotlight on three people who went to the same school. Emilia Fox stars, with Julian Rhind-Tutt and Alex Macqueen.

A series of tragic events are linked to the hacking of a hospital database.

The team wonder if the hack is the only danger as they come under threat.

A US diplomat is shot dead in central London, forcing the team to work closely with the embassy and the FBI.

Nikki is still in shock as the team arrive at Matt's residence but insists on working at the Lyell, determined to help. When analysing crime scene photos and the positions of the victims' bodies, Nikki realises there is a pattern. Together, the team uncover a secret that has been held by those at the very top of the US government.

While two care home staff are chasing Kevin McDowd, a young man with learning disabilities and sociopathic tendencies, Nikki and Jack examine a fatal road accident where the deceased is Kevin McDowd's mother. The investigation led by police sergeant Button should be straightforward, but the forensic evidence suggests foul play.

The team are determined to uncover the truth about unexplained deaths of patients at a care home. They are desperate to rescue Serena and return her to safety. Unbeknownst to her colleagues in the Lyell Centre, Clarissa allows herself to be admitted to the care home in order to investigate. Her determination to find out what happened at the care home leads her to uncover a shocking truth, but puts her life in danger.

Nikki, Jack, Thomas and Clarissa are just settling down for their respective festive celebrations when they are interrupted by a call-out to a tragedy at a family home.

As the truth behind the McMorris family is revealed, the team is brought together by the conclusion of a shocking Christmas family tragedy. Reuniting with their respective families, Nikki finds her secret Santa gift is a visit from a loved one.

When a people smuggler is found dead in the City, Nikki must delve into London's illegal immigrant community. She meets a vulnerable Syrian teen called Akka who is in need of help, putting Nikki in a moral dilemma - and the killer is still on the loose.

When Nikki, Jack and Thomas make a horrific discovery in the van, they are confronted with the work of a killer who preys on illegal immigrants. With the help of Clarissa, they must work out where the killer will strike next before more vulnerable people meet the same fate.

When a photogenic young schoolteacher goes missing, Jack and Nikki are called to the scene and quickly find themselves at the centre of a media storm. Meanwhile, Thomas fights a lone crusade for justice for a troubled young woman who was killed in puzzling circumstances.

Having found a link between the two cases, the team struggles to make sense of it. Nikki visits a disgraced former colleague who may hold the key. Thomas uncovers the bizarre truth about how Tina died.

A woman's body found floating in the Thames leads Nikki and Jack to a community on the banks of the River Lee. Three years ago a teenager called Ruth Tresize went missing from the area, leaving the locals haunted by suspicion and grief. A fresh spate of killings reopens these old wounds.

Nikki is under fire for leaking information on a suspect, and Thomas is called in to play peacemaker. Jack and DI Ashton track down the mystery witness. Before the killer strikes again, the team must uncover the true story of Ruth Tresize's disappearance three years earlier.

When an East End father and son are killed in a shocking road accident, Nikki and Jack find themselves working alongside a police officer with a vendetta. Clarissa summons her husband Max, a digital forensics expert, to help crack the case - and uncovers disturbing video evidence.

Nikki helps Becky come to terms with her trauma. Jack is paranoid that Clarissa will leave the Lyell Centre. Paul is in way over his head.

Nikki travels to Mexico to attend the funeral of Luisa, a former intern at the Lyell Centre who was murdered in a carjacking in her native country. She soon stumbles across the post-mortem report and realises that the body is not that of her ex-colleagues. Assisted by Dr Eva Vasquez and fired up with the idea that Luisa might still be alive, Nikki and Jack trace her last-known movements and are led to a farm where a cartel massacre was carried out.

A frantic Jack carries out forensic examinations on the spot where Nikki disappeared. With Thomas at the airport ready to come out and help, but still 24 hours away and no leads left to follow, Jack receives a text message containing a mysterious phone number. However when Jack calls through, expecting to hear from Nikki's captors, he is shocked at who answers the phone.

Nikki arrives at a murder scene to find it's a carbon copy of a case in her past.

Nikki becomes the prime suspect after a former colleague is murdered.

A young British Muslim returns to the UK, and concerns over her intentions soon escalate.

Thomas must put his personal feelings aside as the team track down Begovic.

An ex-convict is killed and suspicion lands on a recently released child killer.

Further victims are killed and a distinctive modus operandi begins to become clear.

The shooting of a teenager in an armed police operation triggers a series of murders.

Jack leads the hunt for suspected killer Bruno, the brother of the shot teenager.

A family murdered at a picnic leads the team to the female victim's estranged husband.

As Nikki and Jack move closer to the truth, their lives are thrown into mortal danger.

Nikki and Jack strive to track down a sniper at large in London and stem a public crisis.

Nikki and Jack investigate links between the victims to close the net on the killer.

Nikki and Jack investigate a man killed by a train on the London underground.

Nikki helps high-flying DI Luke Nelson unearth painful childhood memories.

A suspected paedophile is found murdered in a children's playground.

Nikki, Jack and Thomas focus in on Lizzie's movements on the night of Barge's murder.

The nanny of a Russian oligarch is killed in a botched assassination attempt.

A young woman working for the Doshis is found dead in Maksim's apartment.

The Lyell team are under pressure to catch the killer of an admired Essex police officer.

When the body of local criminal Jason Simons is found, the course of the case is changed.

Premiership footballer Isaac Dreyfus finds his career in tatters after a sex tape links him to the brutal murder of a young woman, threatening to destroy both his reputation and marriage. He is desperate to prove his innocence, while Adam Freedman turns to a mysterious source for help to avenge the murder of his wife and child. Nikki finds it hard to deal with Leo’s death following the arrival of the new Lyell Centre boss, pathologist Thomas Chamberlain.

Isaac Dreyfus fights to prove his innocence, whilst Adam Freedman turns to a mysterious source for help get revenge for the murder of his wife and child. Nikki questions the motive behind the murders and a re-examination of the Freedman crime scene leads Jack to make a shocking discovery.

Nikki finds her professionalism being brought into question during the case of convicted killer David Bennetto, who was jailed for the murder of two gay teenagers. Thomas attempts to save The Lyell Centre’s reputation.

Thomas is under increased pressure from DI Rachel Klein and the Home Office as he battles to save the Lyell Centre's reputation. Peter Masham makes an unlikely deal with Bennetto's brother-in-law. Jack and Clarissa finally uncover the true identity of murder victim Byron Lee.

Nikki and Jack head to Scotland to help earnest rural detective DS Jason Ross investigate the chilling murder of a lap dancer found in a remote forest. In their search to find a suspect, the team clash with rogue city detectives DS Mike MacNeil and DI Simon Laing. But as more human remains are unearthed in the forest, it becomes horrifyingly apparent that a dangerous serial killer is at large. News of the murders unsettles new mother Sarah, who is harbouring a dark secret from her partner Steve.

Nikki, Jack and DS Ross are feeling the pressure to close the net on a serial killer abducting young women. Concerns increase about missing Sarah, and solving her mysterious disappearance becomes an urgent priority for the team.

After the body of a pregnant Northern Irish girl is found, Nikki and Jack need to locate the baby that has been snatched from her womb. Thomas discovers the girl’s connections to a criminal underworld.

Martin is found dead in suspicious circumstances. Nuri becomes increasingly desperate to locate the missing drugs, with some tragic consequences. Nikki attempts to help a grieving William come to terms with his daughter Alice's death and his missing baby granddaughter.

Jack becomes involved in an investigation into the murder of a 15-year-old girl owing to his personal connection with the prime suspect. Thomas needs to clear up the conflict of interest.

Jack's world has been blown apart following the discovery of Hannah's dead body. Nikki manages to find out the truth behind Jack and Ryan's strained relationship. Thomas thinks about hiring forensic scientist Helen as Jack's permanent replacement. Christy Nash is scared for the future of his marriage and business after DI Carter finds out abouts of his relationship with 15-year-old Katie.

The mysterious death of a wealthy confectionery firm owner plunges Nikki, Leo and new recruit Jack Hodgson into a murky world of corporate subterfuge.

When two women close to a dead businessman are murdered, Nikki, Jack and Leo open his family's skeleton-packed closet.

The murders of two women in a house basement force Jack to lock horns with an old flame, while Leo wrestles with providing a second post-mortem on a baby.

As the basement women case highlights two cooperating killers, Nikki, Jack and DI Reed realise one victim was killed by a controlled sedative.

When a pub landlady is stabbed to death and her little finger cut off, Nikki is isolated in her quest to prove the husband's innocence.

When arrested and interrogated by DI Kate Warren, Alan Lane vehemently protests his innocence and insists he didn't kill his wife.

Nikki is wooed by a science minister as she and Jack investigate a murder on an eco-building project, whilst Leo finds himself trapped in a hospital siege.

Conflict brews between Leo and Nikki when he suspects her new boyfriend is involved in a 50-year cover-up, leaving Leo battling alone to expose the truth.

Human remains found on an Afghan water supply project send Leo, Nikki and Jack to the war-torn region to establish if it is a missing British soldier.

Leo develops a life-changing relationship with a charity worker as Nikki and Jack make a forensic breakthrough on their case in Afghanistan.

When Leo's friend commits suicide, Harry and Nikki are called to the scene of a violent and calculated murder, which is thought to be the work of an apparently dormant serial killer.

Harry and DI James deviate from the original investigation to secretly test DNA evidence from the rival Chesham laboratory to try to solve this stalled case.

Harry is disturbed to be called to a crime scene at the home of a family he knows, and finds the bodies of the mother and her teenage daughter, while her stepson lies in a coma - although her toddler has been left unharmed. The police suspect the woman's husband to be the killer - but the pathologist is not so sure of his guilt. The double-murder investigation reveals more about the tangled lives of the inhabitants of Magnolia Drive

Harry and Nikki delve deeper into the tangled lives of the inhabitants of Magnolia Drive.

Serial killer Arnold Mears Eenjoys poetry but has no remorse for violently killing three teenagers. He has been busy for the last five years sending Annie, a desperate mother of a missing girl, on secret hunts to try and find his hidden victims.Annie’s son Andy, upset at Mears’ manipulation of his mother, ends up turning to Nikki for help. Leo manages to get himself into tropuble with the team after he re-examines a case by Nikki’s old mentor, Dr. Helen Karamides.

Nikki manages to track down the original detective on the case, Detective Inspector Gladwyn ans she looks around the church that killer Arnold Mears used to attend as a boy. Mears is not happy that the police have been made aware of the undiscovered bodies and he says that he is prepared to reveal where he has hidden them to Nikki.

Prison officer Daniel Kessler and Ellis Roberts refuse to reveal anything after child-killer James Wade suddenly dies in his cell. Harry meets Wade’s sister Miriam and agrees to help find her brother’s killer

The team continue to investigate the murder at the notorious Redhill prison where the efforts to control the drugs trade on the wing continue. Harry and Nikki take a good look into Detective Inspector Bridges’ past, and make a significant discovery.

One of Delaney’s patients, Eve Gilston, is discovered dead in her bed. The coroner’s verdict is sudden arrhythmic death syndrome but Delaney is not convinced and gets Leo to investigate. Suspicion soon falls on Eve’s dad Anthony, who lost the family fortune, and his wife Beth.

Leo is determined to learn the circumstances about the death of Eve Gilston. Nikki and Harry manage to find the nun who performed the exorcism but are surprised by what they find. Eve’s mother Beth Gilston is confronted by Leo and che omes close tod iscovering the truth about what actually happened the night before her daughter died.

Nikki stumbles across a sinister underworld where teenage girls are groomed for sex and forced into prostitution.

Harry and Nikki make a crucial connection between the dead girls and sex-grooming victim Shannon, but is it too late for Hannah and Lauren?

When the pathologists investigate three suspicious deaths in one night on the same ward, it looks like hospital staff may be behind their murders. Nikki becomes increasingly disturbed by a rape and murder case involving a young child.

Nikki's mental instability worsens, and Harry and Leo are forced to get her psychiatric help. But then when the true identity of the murderer is discovered, it becomes a race against time to save Nikki's life.

Leo finds himself haunted by past memories when he returns to Sheffield after an ancient body is unearthed on Bleaklow Moor.

Leo investigates a potential copycat killing, but the team are starting to wonder if Karl Bentley was wrongly convicted, leaving the real murderer free to set out on a new killing spree.

As Nikki investigates the drowning of a young mother, Harry is called to an apparent suicide at a nearby army base; it soon starts to look like the cases may be linked.

Having established that Lieutenant Lockford was murdered, Leo makes a startling breakthrough, and the investigation begins to unmask a dark secret at Hillsdon Army Base.

When human rights lawyer Anna Sandor calls Harry to Budapest to investigate the death of a client, they start to uncover a sinister underworld conspiracy, putting both their lives in danger.

With Harry dead and Leo and Nikki getting nowhere with the police, the pathologists struggle to clear Harry's name, while the police seem intent on covering up a wider conspiracy.

After a major incident at the Dutch Embassy, Harry and Nikki are removed from the case when the Dutch decide to appoint their own pathologist.

When the Van Burens' au pair commits suicide, the pathologists start to unravel the truth behind the embassy shootings, and a dark family secret is exposed.

Leo comes under suspicion for fraud when an insurance investigator accuses him of falsifying a post-mortem report, and Harry falls for the charms of an attractive former colleague.

Harry puts his career on the line to prove his lover's innocence after Leo is attacked and Levin turns up dead.

Harry and Nikki try to remain professional when they find themselves on opposite sides of a high-profile case, but it's not easy as they're both brilliant at what they do, and they soon show that every piece of evidence can be interpreted at least two ways.

The revelation that Flannery's first wife also died of a stair fall sends Harry to Prague to seek evidence to prove the man's guilt. However, Nikki's determination to look beyond the police's blinkered investigation leads to further tragedy.

Leo is concerned that the police are involved with a cover-up to protect a rogue undercover cop linked to the death of a young woman.

With Danielle missing and her lover on the run, Leo and the police struggle to unravel a complex web of deceit.

Nikki and Harry try to help wounded victims of a campus shooting while trapped in the building with the rampaging shooter.

Leo's postmortem of the victims reveals there were two guns used, and possibly a second shooter.

When a Zimbabwean asylum seeker is unfairly deported to South Africa, Leo needs to find a way to help her return to the UK.

Nikki is forced to make some hard choices when she discovers that Anton has been less than honest with her.

Leo does community service on a rough estate after being done for drink-driving.

Frustration within the team builds as Harry and Nikki struggle to find any useful evidence from the post-mortems to help the police. No one will talk, and they have no leads. Leo worries for Levi, who is sucked further into a world of gangs and violence.

The team investigates the murder of a woman found dumped on the side of the road with her face removed.

Harry tangles with a Russian oligarch over the murder of a journalist.

The team investigates an armed raid on a suspected terrorist cell in which two suspects and a police officer are killed.

Nikki faces mounting police hostility to her investigation of the armed raid.

Harry is drawn into the murder of a Hasidic man found on disused wasteland, while Leo investigates the death of an Australian backpacker.

A second Hasidic boy is killed, which convinces Harry they are looking for a Jewish killer.

When one boy is found dead and another is abducted, the team faces a race against time to find the missing child.

As the search for Liam continues, Nikki's loyalty towards her former mentor is tested.

The team is asked to investigate the death of a British medical student in Zambia.

Nikki clashes with Zambian police as she investigates the death of a British medical student.

Harry and Nikki are first on the scene when an RAF helicopter crashes, but Harry's search for answers brings him into conflict with the Ministry of Defence.

Harry suspects the Ministry of Defence may be covering up the true cause of the helicopter crash, but he's determined to get to the truth.

When the mutilated body of a young boy is pulled from the river, Leo is determined to give him an identity and to bring his killers to justice.

Leo refuses to back down in his search for the killers of the young boy, despite threats and increasing racial tension.

The murder of a John Doe leads the team to a hospital, where Nikki is investigating a top paediatric surgeon with an unusually high mortality rate.

With Nikki out of action and Alice's surgical team closing ranks, Harry and Leo dig deeper.

Nikki revisits an emotive case from the past when a girl she proved innocent of murder is herself murdered.

Nikki grows increasingly worried that a mistake she made on a case four years ago may have contributed to the murder of a young woman.

When the bones of a young girl are found, everyone but Nikki is convinced it's a teenager who went missing two years ago.

Having fallen out both with both the police and Clara's family, Nikki finds herself increasingly alone in her search for the killer.

When a boat carrying illegal passengers is found crashed in the Thames, the team investigate.

The team follows the trail of the people traffickers, and has to find any remaining survivors before a highly contagious disease breaks.

The team investigates a hit-and-run accident, an arson and a woman who collapsed on her hen night.

The team investigate a man who died on a night bus, an office prank gone tragically wrong and the suicide of a pro footballer.

Harry and Nikki's friendship is rocked by the discovery of the body of Harry's ex-lover.

Memories of his own daughter's death are stirred up when Leo is called in to investigate the suicide of a 14-year-old girl.

Memories of his own daughter's death are stirred up when Leo is called in to investigate the apparent suicide of a teenage girl.

When a third killing takes place on school grounds, Leo races to find some connection between the apparently motiveless murders.

Harry and Nikki are drawn into a war between a medical research establishment and a group determined to take direct action.

With Nikki missing, Harry works against the clock to find out who is responsible for the murders and finds himself in a cover-up.

When his wife and teenage daughter are involved in a hit-and-run car crash, Leo begins a painful journey back to his native Sheffield.

As the police infiltrate a gang of identity thieves, Leo faces a choice between justice and revenge.

The team is called to a drive-by shooting outside a London nightclub. They arrive to a scene of carnage with several people dead, or dying.

The man behind the bloodshed pits both factions against one another and the team are in a race against time.

The team is drawn into the investigation of a series of brutal, apparently motiveless murders in the academic world.

Nikki's beliefs are put to the test as she realises they are facing murders that are committed for sheer pleasure.

A paranoid schizophrenic goes on a violent frenzy in a busy high street. When a young man from the same care home commits suicide, Nikki is convinced there is a connection.

Harry discovers Nazim's death may not have been suicide. Is Dr Sanders the culprit? Meanwhile Leo investigates the murder of a bank manager.

The bodies of two young men are discovered, partially exposed, following a landslide on the coast of Northern Ireland.

The case takes an interesting turn when the bodies are identified as brothers who disappeared after a police questioning during the Troubles.

Suspicious symptoms afflicting a group of children on the coast may be linked to the death of a local man.

Leo hunts for the source of the children's symptoms before any more fatalities occur. Meanwhile Harry discovers the truth behind Nick Garner's death.

The death of a jockey during a race becomes more complicated when the horse's owners are killed in a helicopter crash.

Foul play is confirmed when it emerges that both the horse and the helicopter pilot were drugged. Could syndicate member Matt Gibb be responsible?

Leo and his team are approached by a support group to help discover the truth behind a train crash.

Leo, Harry and Nikki step up their efforts to discover the truth behind the train crash but there are still many unanswered questions.

Sam is called after a suspected terrorist attack causes a fire at a hotel and a government minister is injured.

Sam delves deeper into the case but is undermined by the findings of an independent pathologist, brought in to conduct a second autopsy.

Sam comes under scrutiny at an official inquiry into two prison deaths and an old case Sam worked on 13 years resurfaces.

Sam uncovers a crippling truth about her involvement in a 13-year-old case -did she help convict an innocent man?

The body of a young pregnant sports agent is found in the grounds of her office building. Sam and her team uncover a tragic story of money and corruption.

Following her discovery of the second body and believing the cases to be linked, Sam is sidelined from the investigation as she attempts to get to the truth.

The Home Office ask Sam and her team to examine a number of times of death as given by a highly respected and internationally renowned independent pathologist, Peter Sachs.

Leo and Harry follow up their leads to discover an alarming truth. Are Sam and her team being used by the Home Office to drive out Peter Sachs in fear of a costly process?

Professor Leo Dalton and Dr Harry Cunningham join Sam Ryan in the investigation of a massive traffic accident in which not everything is as it seems.

Sam, Leo and Harry are at odds with the police investigators when a covert operation is exposed. But has Sam overstepped the mark this time?

The police bring in the team when a family is attacked in their own home, leaving the only survivors in critical condition.

A new murder turns DCI Ashton's suspicions toward the victim's family and friends, whilst Harry investigates a death that may be linked to the Irons family.

Murder is suspected when the body of a missing person is found hidden within a derelict factory, seven years since he was last seen alive.

As Sam searches for the killer of Marcus Saul, Harry finds himself involved in the tragic death of a student from the medical faculty.

The murder of a probation officer leads the team to the doorstep of a police cadet college, as they quickly establish a link to a similar murder just months before.

As the police investigate the possibility of a copycat killer among the students, a friend from the college pressures Sam to put loyalty above the truth as the case unfolds.

Two elderly brothers are found dead in their home, with no apparent injuries. A post mortem discovers suspicious puncture marks and a possible racist connection.

A third death helps Sam realise that the motive behind the murders of the Davies brothers was not racial - but revenge.

Sam is called in to identify the naked body of a woman uncovered on a ski slope in Norway.

DCI Norton dismisses Sam's idea that a serial killer is at work - until a third body is found at one of the victim's family homes.

A school director's wife commits suicide, but Sam suspects murder. During the investigation, she receives shocking news about her own health.

A second post-mortem is perfumed on Helen Dupen and, although Sam is obviously ill, she is determined to find more evidence.

Sam learns that the captain of the helicopter died of a heart attack, but she doesn't think it was the cause of the crash, and with 75 helicopters grounded, accident investigator Tony Newsome needs some answers.

Sam learns that the captain of the helicopter died of a heart attack, but she doesn't think it was the cause of the crash, and with 75 helicopters grounded, accident investigator Tony Newsome needs some answers.

A small-time criminal is the prime suspect in a gangland murder. Sam Ryan believes he may be innocent.

Sam challenges the police after an indepenedent postmortem into McNally's apparent suicide. Further deaths take place.

Sam searches for the identity of a victim of a cinema fire. A medical artist helps her reconstruct the face, but the result causes some embarassment for the police.

The identity of Body 10 reveals that a violent criminal may have been wrongly convicted of a murder. Sam and DCI Connor are eager to get the truth.

Sam must investigate a case with a painful personal connection when a close friend is murdered after the Cambridge May Ball.

The case becomes entangled in Annabelle's romantic relationships when Sam discovers her friend may have had an affair with a student.

A young woman is found dead in an empty house. Why was she there? Sam suspects another person was involved.

The hunt is on for Mr Harris, but the murderer may be closer to home. Meanwhile, Sam grows closer to surgeon James Reynolds.

A tragic scene is discovered when a young mother apparently dies of an overdose. When another addict dies in an explosion, Sam has a bigger case on her hands.

Are the deaths linked to a drug war or is this the work of vigilantes? Sam suspects a personal tragedy is at the heart of things.

The death of a farmer involving a combine harvester seems like an accident - until Sam receives an anonymous tip-off.

Sam looks for connections between Ian Neal and a killing in Northern Ireland in 1985. Meanwhile DI Connor's wife arrives in Cambridge.

A boxer dies from brain injuries mid-bout. A new DSI takes over the team's investigations. Sam and Wyn bury their mother.

Sam discovers why Kevin entered a bare knuckle fight, as well as uncovering evidence of more foul play in the boxing circuit.

Stuart Evans is in the advanced stages of Aids when he dies, and his body is donated to science. However a routine toxicology test reveals foul play was at work.

The police make an arrest, but do they have the right suspect? Sam pursues her own line of investigation.

The murder of a married woman who was having an affair seems straightforward. Friction develops between Dr Ryan and the police when the evidence complicates their case.

The murderer makes a direct threat against Sam's life after she uncovers the evidence needed to identify them.

The police suspect a violent alcoholic of the murder of an elderly woman. Sam clashes with the police when she refuses to support their case.

Sam's pursuit of her own theories leads her into dangerous places, both personally and professionally.

Dr Sam Ryan investigates her first case as a police consultant - a tragic case involving the death of a child.

The murder investigation continues and someone breaks into Sam's house. Undeterred, she continues her search for the truth.

When Mark James's decomposing body is discovered, it bears all the signs of a ritualistic killing.

The police grow frustrated with the lack of a forensic link, but Sam finds more clues in an old case.

The death of a man in custody seems like a straightforward case, but DS Farmer has concerns about some of her officers.

Someone is harassing Sam as evidence of a cover-up mounts, and the bomb squad is called in to deal with a mysterious parcel.

Tragedy strikes after a student asks Sam for advice over her arranged marriage, and then sees her family torn apart.

Sam tries to persuade her student to reveal where her father is hiding. The tragedy spreads beyond the family, and even the team may be in danger.