Mannix has side action on a kidnap case.

A fake Renoir is suspected, and the model is in danger.

Mannix is hired to find out any dirt on Govenor-elect Adam Pierson, and that's when the trouble starts: with his syndicate connections, people are dying fast.

A scientist goes missing with a new formula.

Mannix takes the case of a death row inmate.

Investigating an insurance claim, Mannix finds himself intensely scrutinized.

An undercover cop's murder exposes a vice operation.

Undercover at a health farm for boozehounds.

A psychopath's next victim might be his wife.

The strong friendship between Lew Wickersham and Mannix melts into a violent and deathly feud. The bitter battle begins when Mannix launches an investigation into the theft of a highly secret formula for the development of a laser ray. Stolen plans and sabotage involve Intertect and their agents.

The two paths of the case meet at the water's edge.

Mannix quits rather than chase a necklace and a mobster, and stumbles into a case of murder and fraud.

An unsolved murder and an author with enemies.

A missing million leads Mannix out of Intertect as bait for a drug ring.

Blackmail in the film industry.

A libel suit against a newspaper at the state capital involves politics and the mob.

An incommunicado coed and a murdered basketball player.

A missing boy and a cover-up.

Mannix checks out an actress with an enemy.

Old labor woes come to light after an attempted murder.

Mannix is set up for the murder of an old girlfriend's husband.

Mannix is hired to vet a prospective bridegroom.

A faith healer gets blackmailed.

A threatened suicide.