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

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

A supposedly reformed sex offender believes he is going insane.

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

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.

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.

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.

Misguided radicals take a jury hostage in a case where corrupt "movement leaders" are being tried for murder.

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

Mike and Inspector Dan Robbins make a last-ditch effort to save the jury from execution at the hands of the radicals.

An abused wife vanishes after a vicious attack by her drunken husband and all clues point to murder with the husband as the prime suspect, but he can't remember if he did it or not.

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.

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

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.

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.

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

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

A nice, normal 16-year-old hooker keeps having her johns turn up dead; Dan is particularly horrified by the case.

Stone must protect a former book keeper's wife, in order to have her testify against several high profile mobsters who want her dead because of the evidence she has against them.

An episode where there are two parallel stories: A small business owner is going through divorce proceedings while his business is in financial straits. His wife's lawyer just happens to also be hunted by a revenge-seeking ex-con.

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

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.