A blackmail victim is headed for prison.

A big kidnapping plot and an insignificant victim.

Mannix is the eyewitness of a murder; reportedly, it occurred a year before.

A labor dispute in his home town ends in murder.

Soviet agents want Marx's manuscript of Das Kapital, and a young woman has just inherited part of it.

A skid row bum is concealing his identity.

A contract is taken out on a Little League manager.

Strange circumstances surround an arrest by Mannix.

Peggy is kidnapped to force Mannix into an investigation.

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

Blackmail has its twists and turns.

Hired and fired, Mannix pursues a missing person.

Blackmail turns to murder and beyond.

Evidence rules out one confession, indicates another.

Disappearing enemies and friends force Mannix into a blackmail investigation.

Murder on the golf course leads to open season on Mannix, who's looking for valuable microcircuit plans hidden by the victim.

A dubious client is caught in his own machinations.

The fictitious name on a partnership contract apparently comes to life.

Mannix in the middle of a gang war.

In defense of a client accused of murder.

A singer piles into mounting trouble with the law.

Was a police shooting premeditated? Mannix is on (and off) the case.

Mannix transports jewels from London, or is that his double?

A racing accident lays Mannix up. While recuperating, he hears threats against him, but are they real?