When a young wife discovers her husband of two years is involved with his beautiful secretary, she applies for a job as secretary to a business rival.

Private detective Michael Shayne is on the case again, but this time he's stuck on a jury for a murder trial. So, what does he do? Why, he skips out on sequestration in order to solve the case himself!

A San Francisco private eye finds himself under suspicion while investigating a prizefighter's murder.

Millionaire sportsman Hiram Brighton hires gumshoe Michael Shayne to keep his spoiled daughter Phyllis away from racetrack betting windows and roulette wheels. After Phyllis slips away and continues her compulsive gambling, Shayne fakes the murder of her gambler boyfriend, who is also romancing the daughter of casino owner Benny Gordon, in order to frighten her. When the tout really ends up murdered, Shayne and Phyllis' Aunt Olivia, an avid reader of murder mysteries, both try to find the identity of the killer.