St. John investigates an old crime when the long missing body finally turns up, along with evidence that the police framed the man convicted of the crime.

St. John searches through the cutthroat music industry for the killer of a recording artist.

When the heir to a Greek-American fortune is murdered, his estranged younger brother becomes the prime suspect.

St. John looks for a killer and jewel thief inside a posh Los Angeles hotel.

The suspects in an actress's murder—a failed director, a faded star, a clerk, and a priest—are placed under police surveillance.

John tracks down a murdered barber/bookie's two sets of client to find who killed him.

A criminologist whose speciality was the rehabilitation of parolees is killed and his research assistant assaulted, leaving St. John to piece through the man's work to find a suspect.

St. John searches for a serial killer dubbed ""The Executioner"" and rages when Sam's reporter ex-girlfriend reveals information about the case on television.

John and Sam argue when a strange teenager claims to have witnessed a murder; while St. John dismisses her as an emotionally disturbed attention-seeker, Sam believes she's genuine.

In the wake of a bank robber's return to Los Angeles, St. John investigates the murder of a witness to the man's crimes and tries to protect the remaining witnesses.

A murder leads St. John to another case when he discovers a link between a woman killed by plastic explosives planted in her car and an electronics firm.

St. John investigates the murder of a Texan who'd recently moved to Los Angeles and finds a world of cheating wives, greedy art dealers, and opportunistic gigolos.

John goes undercover in a sanitarium to investigate reports of elderly patients being bilked and murdered.

St. John enlists a local sheriff to help hunt down a woman suspected of murdering an small-town real estate promoter found dead in a Los Angeles motel.