Judy Wilson (Gale Storm), feeling neglected because both of her parents are working in defense plants, meets and falls in love with Danny Chester (Jackie Cooper), who enlists in the Navy and is sent to San Diego for training. She accepts an invitation to go on a ride to San Diego with her friends Herb (Neyle Morrow), Opal (Evelyn Eaton)and Jerry (Jimmy Zahner) but doesn’t know the car has been stolen.

To solve the murder of a man shot in a locked room, Chan must wade through a Fun House, the writings of an unscrupulous author, and chess pieces.