Heir Today, Gone Tomorrow

Billy has hazy memories of the wild party celebrating the approach of his twenty first birthday, and he is very surprised to find a pretty girl clad only in her underwear under the blankets on his sofa. He is also upset because he has been willed a small fortune by an aunt, provided he remains "pure" until this birthday. Complications build hectically involving, among others, a telegram boy who ends up dressed as a girl, Billy's formidable mother, a suspicious policeman, and a solicitor who has fathered half the cast.