A female private detective, Harriet Zapper, is hired by a rich old man to find his missing children, and becomes involved in counterfeiting and murder.

A man inadvertently gets caught near a car explosion, and after he recovers from his injuries realizes that he has amnesia. Soon evidence begins to mount that he could be "The Claw Hammer Killer, " a serial murderer who targets for death the former patrons of a particular restaurant called Puzzles.

When Hamilton High’s Prom Queen of 1957, Mary Lou Maloney, is killed by her jilted boyfriend, she comes back for revenge thirty years later.