Homicide detective Kenny Williams (Melvyn Douglas) is so attached to his police work that his longtime fiancée, Maxine Carroll (Joan Blondell), wonders if he would rather solve a case than get married. When Maxine convinces the police captain (Clarence Kolb) to threaten Kenny with suspension, Kenny shows his dedication by accepting a case requiring him to dress as a woman. With a killer on the loose, Kenny must decide between his career obligations and his fiancée's wishes.