When a lady cop is killed in a drug sting gone wrong, her boyfriend cop decides to take matters into his own hands. Stone and Keller try to stop him.

While a psychopathic killer uses San Francisco hi-rises as target practice, Stone and Keller have to contend with a new Captain who immediately countermands everything they do.

Prison gangs intimidate weaker prisoners into having their wives smuggle drugs into prison -- and kill the wives if they don't.

A rapist targets Stone's daughter and her friend; a radical feminist organization encourages them to take matters into their own hands.

A retired history teacher goes off the deep end and takes it upon himself to take a group of his former students hostage in an empty, condemned school. There, at gunpoint, he proceeds to teach them the finer points of history.

After Stone is hit by a van and suffers an inner ear injury, he considers changing to a desk job. Meanwhile, the vengeful wife of a man he killed stalks and tries to kill him in his half-deaf state.

Property owners who refuse to sell their parcels find themselves murder victims at the hands of a developer.

When a gang of smuggling sailors kills a jeweler, they realize they have to eliminate his girlfriend for being a witness, and Keller, who is transporting the girlfriend to jail.

Keller and Stone's sole witness in a jewel robbery turns out to be a compulsive liar.

A sleazy radio host is accused of murder when a former girlfriend, who was pregnant, is shot.

A youth-center worker is caught in a war between two teenaged street gangs, a war that really has the heat turned up when one of the gangs obtains automatic rifles.

Lieutenant Stone is placed in the awkward position of investigating a burglary with Irene Martin, a lady cop -- who is also his girlfriend who he's just proposed to. She resents his intrusion into 'her' case and their relationship unravels.

The death of a night-watchman during a burglary puts Stone and Keller into the midst of a spy-vs.-spy conflict between high-tech industrial espionage firms.

A teacher is murdered at an exclusive all-boys prep school.

A vigilante is methodically and savagely wiping out criminals who have managed to slip through the fingers of the legal system.

Stone and Keller search for the only eyewitness to a shooting -- a self-proclaimed doctor who gave them a false name.

A bishop (Mike's friend) tries to protect the person who shot him, but revelations in the course of the investigation start to shed suspicion on the bishop's accounting of events entirely.

A cop seeks to catch his brother's murderer by going undercover in an illegal gambling operation.

Four judges have been murdered, and in each case an obsolete pamphlet on disbarrment proceedings is found near the body...

Two retired brothers, both having worked as riggers for circuses many years before, are found murdered while a circus happens to be performing in San Francisco at the Cow Palace.

Stone clashes with an abrasive NYC cop who is on the trail of his partner's killer.

When an Immigration raid goes wrong and a security guard is killed, the prime suspect becomes one of the illegal immigrants.

Stone searches for a fugitive, and is dogged by the fugitive's innocent and naive daughter.

Alcoholic officer Joe Landers (Leslie Nielsen) accidentally gets his partner killed and clumsily tries to cover it up as Stone and Keller work their way to the truth.

A high-ranking hoodlum hires the androgynously-named "Sidney"--a hitwoman who's assigned to murder the three thugs responsible for the death of his son. She decides to let the police do her digging for her and moves in next door to Keller...

Bill Bixby plays a former CIA hitman who is hired by some kooky generals to assassinate a Red Chinese envoy on a state visit to San Francisco.

A professional female impersonator, whose headline act is a perfect imitation of 1930s movie star Carol Marlowe, is overwhelmed with an alternate personality -- and murdering any man who is unlucky enough to be attracted to "Carol."

Steve Keller goes undercover as a draft-dodger to discover who killed a young Vietnam war deserter.

An average older woman is concealing an affair with a married diplomat, whose wife hires an unbalanced youth to kill her.

A bum blackmails a black guy. The bum's friends roll him for the money and attempt to pin his death on the black guy, who is the lovable and successful nanny to a young kid. What's the black guy hiding?...

Domestic terrorists take several people hostage, including Keller. Stone has to deal with not only the terrorists but a right-wing journalist and a vengeful father whose daughter was killed.

A troubled teen from a broken home is suspected of shooting a friend's stepfather.

A boy who saw the slaying of a mob chief is torn between telling Stone and joining the syndicate.

Women keep turning up in hotel rooms strangled; the only lead is a witness who thinks he saw an air force Colonel's uniform. Keller goes undercover as an air force officer to infiltrate the base.

Mike's former partner returns to San Francisco, but not because of any longing for the good old days. He's back in town to kill the hired gunman who murdered his son years before.

A single .25 caliber pistol affects many lives in a single weekend.

A retired cobbler takes the rap for a shooting to protect the real killer, the grandson of his best friend.

When a patrolman and personal friend of Keller has his arrestee turned loose on insufficient evidence, he goes on the warpath, endangering both of their careers.

A skeleton discovered on Alcatraz is that of a convict who'd supposedly escaped in the 1950s.

While investigating a lead, Steve is run over by a car and rendered a vegetable. Mike insists on taking revenge, and is demoted to walking a beat.

A policewoman's son has an unusual hobby -- he holds up taxicabs. Eventually this results in the murder of an undercover cop.

A supposedly reformed sex offender is being brainwashed by his psychiatrist into believing he has committed murder.

A man seduces the widow of a bank robber. The money he stole was never found. When she tells him where it is, he kills her and sets out to take the money from her children out in the country.

Keller goes undercover at a mental hospital to uncover the truth about a string of mysterious deaths.

A prizefighter refuses to throw a fight, instead opting to throw the gangsters out the window of his hotel room. Injured, he hides in the hotel as both the police and mob close in.

While Keller recovers from a gunshot wound, Stone is forced to team with hippie-haired narcotics officer Al Walczinsky. Together they try to break up a narcotics ring that's gone murderous -- until Stone suspects that Walczinsky's in on the racket.

Keller returns fire during a chase in a dark shopping center, killing a kid, but the body comes up unarmed. The boy's father insists Keller is a murderer.

One of the girlfriends of a young charmer recognizes her boyfriend as the man who stuck up her bank.

In order to stop a psychotic priest-killer, Stone goes undercover as a Roman Catholic priest. The victims were all clergymen who studied at the same seminary.

A cop (Nielsen) who finds out that he has a terminal illness, sets out to kill a racketeer (Danton) who had been his quarry for the last year and a half.

A small-time crook accidentally heists a fantastic sum from a small store that is actually a Syndicate front.

Lieutenant Stone and Inspector Keller go after two insurance agents involved in the counterfeiting of an 1850 2-cent purple Guyana stamp which had a value of $250,000.

A flute-playing "Pied Piper" (played by Ricky Nelson) talks teenage girls into prostitution, then disposes of them when they are no longer convenient. Stone's daughter helps him break up this murderous prostitution ring.

A black police informant is murdered, but the police seem more concerned with the death of a white business man. His flinty daughter forces the police to go after his killers.

Crooks heist a truck filled with gold, not knowing that the gold is the irradiated byproduct of a power plant experiment and extremely toxic.

Internal affairs suspects that something is amiss when a witness under police protection is killed. Someone in the Department is a Syndicate informer--and everyone is under suspicion, even Stone and Keller.

A trio of violent prison escapees leaves a trail of blood by murdering or crippling everyone they see.

The oldest of a set of three young sibling runaways is suspected of the murder of a drugstore owner. His animosity towards authority doesn't do him any favors.

Angered by the rising cost of health care, an old man tries to pay his friend's bills by threatening a businessman with the bombing of his buildings.

Believing her baby was kidnapped, not stillborn as people claim, a deranged new mother embarks on a murderous quest to find the truth.

An undercover cop is murdered with Stone's gun, and a hotshot young inspector seems determined to pin the rap on Stone.

Stone and Keller work to crack a kidnap case where the mother is friends with an alleged psychic.

A woman who has dedicated her life to a prominent family fails to see her neglected son has fallen in with a psycho—and may have helped him kill a woman.

A philandering professor is killed and his mistress shot by a sniper who has been terrorizing a college campus.

Keller goes undercover as an ex-con musician to bust a crooked parole officer and his ring of parolees.

Stone looks for the arsonists who set a fire that killed two firemen.

A cowboy was trampled to death by a bull; his mates suspected it to be murder.

A team of angry fathers, who are fed up with crime in their neighborhood, take a vigilante approach at solving the problem. During one of their rampages, a police informant is killed.

San Francisco's social elite are suspects when a publisher who blackmailed them is found murdered.

When a police officer is fatally shot 3 days before he is due to retire, Stone undertakes a relentless search for the killer.

Stone and Keller finally get a lead on a serial killer who has been knifing prostitutes when one of the victims survives the attack.

A salesman attending a convention wrongly believes that he is responsible for the death of an attractive female hitchhiker who had lured him to her houseboat.

A Vietnam veteran goes AWOL from the army in order to kidnap the son he has never seen.

Stone and Keller face off against Gilliam, a wealthy executive who transforms women into his own special image of perfection, then kills them when they inevitably fail to live up to every demented standard of his.

Keller, temporarily partnered with a hotshot detective, sets out to discover why his new partner seems to be absolutely convinced of a murder suspect's guilt for no apparent reason.

Stone appears to be the only one willing to give the benefit of the doubt to a convict who is accused of a murder while out of prison on a 36-hour pass.

When a corner newspaper vendor goes after the muggers who stole his life savings, Stone and Keller discover that the crime is linked to the murder of a housing commissioner.

The murders of a flight attendant and a nurse who were rooming together lead Stone and Keller to suspect a jewelry salesman and his wife.

In their attempt to bring down a family of con artists who victimize entire neighborhoods, Stone and Keller are aided by dissension among the gang members.

A college professor, shot accidentally while trying to pay off a blackmailer, refuses to co-operate with Stone's investigation for fear that the publicity will lose him an upcoming promotion.

A man who served 12 years in prison to protect his brother gets out only to find that the brother never told their father, a Greek restaurant owner, the truth about who should have gone to jail.

Stone and Keller suspect that an artist's fatal fall from his studio window was not an accident.

Two fishermen (Colasanto and Caruso) decide to keep quiet after witnessing a human smuggling ring.

After a female detective is killed by the rapist she had been bait for, her roommate (played by Brenda Vaccaro) goes on the warpath to catch him. After Mike Stone kicks her off the case, she continues on her own, hurtling headlong into peril.

A retired hit man returns to San Francisco, not knowing that he will be the target of a hit.

A murder brings to light a coin dealer's plan to substitute fakes for the rare coins in a collection.

One witness in a racketeering trial is killed with a booby-trapped car, and Stone worries that the remaining witness, Roy Chaffee, will be picked off by a hit man if he surfaces.

Stone discovers that a murdered woman was involved with both a famous newspaper reporter and his son.

A gang takes Mike Stone hostage after killing a policeman in an attempt to flee from a grocery store robbery. They want to trade Stone in for their leader, Buddy Sims.

When a boy disappears after school, suspicion falls on the neighborhood recluse, who is popularly known as a pedophile, although never convicted.

After spending a "lousy" 12 years in prison for a brutal sexual assault and murder, a young punk returns to San Francisco to seek revenge against Mike Stone (who was the arresting officer). And he's not picky about how he'll take that revenge -- or on who.

A father finds out that the man who murdered his deaf son is released on a technicality.

Mike Stone has reason to believe that the death of a politician is no accident.

A priest (Fr. Scarne) won't tell Stone where a murderer (Abel Hoffman) is hiding. Stakes are raised by drug smugglers looking for a stolen shipment of heroin.

Stone goes undercover as a bum to investigate the beating death of three homeless men.

Detectives Stone and Keller try to reconstruct the final days of a young woman found dead on a beach, in order to find clues to identify her killer.