The owner of a jewelry shop is murdered. When Mannix arrives at the crime scene, he runs into an old friend from his days in the Korean War who asks him to visit a small mountain town where he can gain information on the situation.

A woman is attacked in her apartment and thrown out her balcony to her death, and the police conclude that it is a suicide thanks to a forged suicide note Mannix believe she was murdered and investigates the death.

A tennis pro turns up dead after trying to blackmail a gubernatorial candidate, and Mannix is hired to find the killer.