A smoking, drinking, jazz listening, young prostitute named Sadie Thompson (Gloria Swanson) arrives at Pago Pago (American Samoa), on her way to a job with a shipping line on another island. At the same time, 'moralists' arrive, including Mr. and Mrs. Davidson (Lionel Barrymore and Blanche Friderici). They all end up staying in the same hotel, where the Davidsons plot to teach the natives about sin and Sadie entertains a bunch of Marines.