Two prison cell mates plan a robbery together whilst inside and then stage a fight and kidnapping when they are released to keep the Sweeney off their trail. The Sweeney tail Kibber believing he has killed Oates but have no proof. Kibber gets away and The Sweeney release Oates has blackmailed a London bank when it is too late.

Regan whilst on a routine operation spots Billy Medhurst, who had been part of a gang that carried out a robbery in which a former Sweeney officer, Eddie Jackson was shot and left permantly disabled. Regan blames himself for the accident and decided to get Medhurst put away, but is the past clouding his judgement and destroying the case?

Turkish policeman Captain Shebbeq arrives in England for his old friend Regan to help him track down a gold-smuggling ring, possibly connected to an insurance firm which is fire-bombed. Their joint investigation leads them to uncover another form of smuggling, in the process of which someone puts a bomb in Regan's car. However, he does have the last word on the zealous fellow cop who had him suspended.

Technophobe Regan is initially all at sea when he comes up against the clever computer expert Tony Gray. Gray is bent on revenge against Dennis Longfield, intending to steal his gold bullion consignment with the help of a little computer trickery but, at the end of the day, it’s Regan’s old-fashioned policing methods that get the results.

Robert Hargreaves, who has an apparently distinguished military background, joins Regan’s team. However, at a raid on a caravan site to capture a gang of ex-soldiers who have carried out a violent robbery and are armed, Hargreaves bottles it and cowers behind a tree. Running against the general tide of opinion, Regan believes he is unsuitable for the job but needs to find out more.

Haskins is concerned that, in an adjacent manor, crooks seem to be getting nicked and then released without charge. Posing as an ex-con Regan follows a lead to the Blue Parrot club, haunt of corrupt officers Perraut and Huke who take bribes from villains to let them go and are running a protection racket. Using marked notes he sets them up.

Regan gets involved in gangland warfare following the death of one of London’s leading villains.

Young Davey Holmes is arrested after an elderly money-lender whom he has visited is attacked and robbed, and May, his mother, asks her old friend Jack Regan to intervene. Although it is proved that he got a legitimate loan and is innocent of robbery, his troubles are far from over as he is being blackmailed and has fallen foul of some very dangerous people. He really needs Regan’s help.

At a stag party Regan re-encounters well-to-do Raymond Meadows, an ex-criminal who drunkenly admits that his wealth is due to a robbery he once pulled, for which Regan let him go for lack of evidence. Widower Raymond disapproves of his daughter Debbie’s boyfriend, flash villain Dougie Owen, and Regan suspects Raymond is using him to get the boy out of the picture. However, Owen plays directly into Regan’s—and Raymond’s—hands by using Debbie as the innocent pawn in a robbery.

Carter is asked by an old flame, Shirley Glass, to try and help her locate her partner Eddie, who has gone missing. Eventually Eddie, a small time crook, is discovered dead. Shirley works as a croupier for the smooth Arnold Drake, whom Regan and Haskins suspect of large scale misdemeanours, and they use Shirley and Carter as bait to trap him.

Retired engineer Fred Booth has a very religious but very sick wife and is in need of money. He meets wide boy Artie Ward who pays him to make guns, which Fred genuinely believes to be replicas, but they are in fact the real thing and Artie sells them to kids who use them to hold up small businesses. When an off-duty policeman is killed by one of these faulty guns along with the youth he was chasing Regan is desperate to find the source.

Regan knows the identity of a robber, but has a difficult time proving his guilt.

An armed robber is sprung from jail and comes looking for Regan.

Giles Nunn and Carrie Selhurst are an upper crust couple who, partly for kicks and for the profits, commit highway robbery in lonely country lanes, along with the lower class boy Tommy Garret, whose dad is a friend of George Carter. Regan is on to them and Carrie gets arrested, but her unwillingness to cooperate leads to the death of the next victim.

A masked gang robs a security van and Carter’s informant names ex-soldier Tober as its leader. Regan trails the gang to their junk shop hide-out where they plot their next heist for their client, a German political terrorist. The Secret Service has one of their men infiltrating the gang and Regan is told to back off arresting them so as not to blow his cover. Regan, however, is his own boss and goes ahead with the ambush.

An informant of Regan’s tells him about a hijack involving a lorryload of cigarettes where he will be the look-out man. But can Regan trust his snout?

Suspect Andy Deacon collapses whilst Regan is interviewing him and a doctor claims that his injuries were caused by an assault. Whilst Regan never touched him, he is suspected of giving the lad a kicking. Deacon’s dangerous older brother Phil puts out a hit on Regan, whilst muck-raking journalist John Frewin also tries to expose him in the local press. Regan and Carter must find the man who really hospitalized Andy Deacon before it is too late, though Regan’s new lady-friend, a probation officer, is able to help.

A case of mistaken identity provides tragic circumstances when a hit goes wrong; Regan and Carter manage to break the hit-and-run ring, and then try to stop another accident.

Five years earlier Regan got promotion following the Golden Maid dairy robbery, thanks to a tip-off from Noah Riley. Now a reporter, Thomas, has got Noah and offers him money for his elderly mother if he will claim Regan acted illegally in order to discredit him. Regan’s efforts to find Noah and prove conspiracy without telling Haskins put him in danger of suspension and Noah’s mother in danger from the dairy robbers. Perhaps mini-cab boss Manny Bellow can come up with helpful information.

Colin MacGruder and Ray Stackpole, two Australians with the theme ‘Nice ‘n’ easy does it’, commit eleven armed robberies, in each case stealing Kruger Rands purchased from the same firm, the managing director’s secretary tipping them off as to the whereabouts of the coins. They also pay an informant to make it look as if Haskins is taking a bribe and plant money in his greenhouse, so that he is suspended. Regan traces the Kruger Rand connection but all the villains escape. However, the absence of witnesses means that Haskins is completely exonerated and reinstated.

Vic Labbett, a violent robber who fled England following a robbery, has now returned from exile but only temporarily. His aim is to pick up the cash from the heist and convert it into diamonds and fly out of the country again. Regan is on to him and although Labbett initially eludes him, a muddy car chase across the air-field leads to his downfall.

Two young villains, Tyson and Jenner, working for gang boss Tony Kirby, are relieved of the spoils of their robbery by a mysterious gun-man, who shoots Jenner in the leg. Nobody knows who he is until Regan has a word with Jenner’s disgruntled father-in-law, which leads to a shoot-out in a theatre. At the same time Regan is made a tempting offer to go into private security work.

Australian villains Colin MacGruder and Ray Stackpole return to London and steal a bus, posing as its crew. They rob an art dealer travelling on the bus of a Goya painting, which they plan to sell to a buyer in Amsterdam. Regan tracks them down by leaning on their accomplice, the dealer’s female assistant, leading to a river chase and a shoot-out, making it the end of the line for the boys from Down Under.

Informant Popeye is abducted by villain Maynard whilst staking out small-time crook Frankie Little after a jewel theft. Regan pulls Little but agrees to drop charges if Little will go ahead as planned, acting as Maynard’s driver on an upcoming robbery. However, all Little is able to phone in to Regan on the eve of the heist is “Old Readies”. Regan must locate where the crime will take place before it is too late for Popeye.

An armed gang kidnap telephone engineer Ronald Peters and hold him in an empty house, using his expertise to trigger off false alarms in some banks, diverting the police whilst the gang rob alarm-free premises. Regan is initially resentful when college graduate Sergeant David Keel, a telecommunications expert from Bristol C.I.D., is drafted in to help, but comes to respect his knowledge and his bravery in catching the gang.

The day before the start of a new term, the university branch of the National Mercian bank is robbed. Regan and his squad arrive and catch or shoot most of the gang but known killer Hands and simple side-kick Monks are still inside with the manager and two women hostages. Haskins' hesitancy in ordering the police marksmen to fire on the robbers leads to a car chase and fatalities, causing Regan to round on his boss.

After Regan’s car is stolen with invaluable surveillance photos from a stakeout, the thief gives a heads-up to Sweeney’s target.

Regan’s flying squad falls under suspicion after they apprehend a gang of hijackers, but a bag with 35,000 pounds in it has somehow disappeared.

Regan clashes with an arrogant police superintendent when a crime kingpin is allowed to leave the country and go to France.

After a high-powered lawyer gets three petty thugs off on a murder charge, Regan is authorized to use whatever means necessary to bring the hoodlums in.

Regan is convinced that Eddie Boyse, a recently released career criminal, is responsible for a robbery, but Boyse was with Regan when the crime occurred.

When the Superintendent finds out that there is a bank robbery in progress on a Saturday afternoon, he assigns Regan to visit an old girlfriend whose apartment is adjacent.

Regan adopts a new identity as an ex-con and goes undercover as a truck driver to expose a hijacking ring.

It’s unclear whether a beautiful crime reporter is involved with a criminal gang or just a catspaw.

When seedy informant Harry Fuller is spotted by Regan in a pub flush with money, he knows something is up and interrogates Harry.

After their own getaway driver is killed fleeing police, a gang blackmails a young policeman into being their driver by kidnapping his bride.

The Smith Brothers, a vicious group of mobsters, abandon their usual strong-arm tactics to run a parking ticket scam at a car park.

After Danny Keever, a convict on weekend release and due for parole, is framed in a bank robbery, Regan works to clear him.

After Regan gets a tip about an upcoming robbery from a trusted informant, the gang kidnaps his daughter to blackmail him into inaction.