With a title like Jack's the Boy, is it any surprise that the star of this breezy quota quickie is British music-hall favorite Jack Hulbert? The star plays the son of a celebrated Scotland Yard detective, who joins the force in hopes of following his father's footsteps. Unfortunately, Jack is something of a screw-up, and before long he has become the laughing stock of the force.

A rich but miserly old man taunts his relatives about who will get his money when he dies, and is soon mysteriously murdered. It turns out that he has left his estate to a beautiful young actress whom the other relatives didn't know was related to him. Several attempts on her life are thwarted by a detective, who sets out to discover who's behind the scheme to kill her.