Ronnie Jackson (Bob Hope) is a baby photographer who fantasizes being a private eye. A baroness (Dorothy Lamour) actually mistakes him for one and asks for help locating her missing husband. This is followed by sinister doings in a gloomy mansion & sanatorium, with Peter Lorre & Lon Chaney Jr. Hope's character ends up framed for murder with every plot twist & parody of thriller cliches imaginable.
