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

Ross and Alex are members of Mannix's college football team who put together an unconventional reunion in a ghost town. The reunion ends in murder and reveals years of deceit and jealousy that come to light in a series of bizarre and morbid.

Strange circumstances surround an arrest by Mannix.

The Case of the Singing Harp: a singer is kidnapped to reveal hidden loot.

Disappearing enemies and friends force Mannix into a blackmail investigation.

Mannix in the middle of a gang war.

Exposing a cover-up puts Mannix in hot water.

A Leonardo, a forger of currency, is sought by practically everybody.

The death of an inventor raises questions of motive.