A supposedly reformed sex offender believes he is going insane.

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

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.

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...

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.

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.

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 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?...

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

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.

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

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.

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

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.

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.

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.

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

An average older woman is concealing an affair with a married diplomat and believes she is targeted for death.