Two pals of Peggy's are accused of murder, and the real killer is elusive.

A colleague's death leads Mannix into a dubious investigation.

Old home week, as Mannix looks into a murder and tries to make up with his father.

Someone is out to get a film star.

Mannix reopens a malpractice case against opposition.

Three thugs hold Mannix, Peggy, and a woman hostage, claiming they want the $312,000 she has in a briefcase at home, but they may be after something even more valuable.

An accidental drowning has many surprising facets.

A secretary has an enemy, but who?

A hit-and-run case lands Mannix in the middle of a gang war.

A killer's attempt leaves Mannix blind.

The attempted murder of an executive leads Mannix to several likely suspects.

A stolen thoroughbred has Mannix buffaloed.

A policeman's son is suspected in a robbery.

Peggy's late husband is named on a list of payoffs.

A wealthy man hires Mannix to find the person blackmailing him—eventually leading to Mannix being suspected of murder.

Eyewitnesses peg Mannix's client, but the victim isn't what he seems, either.

A domestic quarrel, and a missing secretary, make for a confusing case—“Rashomon”-style.

A murder in the offing implicates an old army chum, but the victim's identity is uncertain.

Mannix has an enemy who seems to be dead.

The strange utterances of a disturbed young girl are clues in a case of robbery and murder.

A colleague's death leaves Mannix with the evidence he was murdered for.

A TV host's murder proves difficult to investigate, as everyvbody wants it canceled.

Mobsters try to extort a million from a small town.

Carnival mishaps may be aimed at the proprietor.