Leroy Trenchard loves Therese Verneuil, and when Leroy enters the army goes to France to fight, Therese follows as a Red Cross nurse. But suspicion arises that Therese is actually Princess Sonia, a German spy.
Marcel Duchamp alternates between scrutinizing the camera, and smiling and nodding in response to what seems to be a large crowd of off-screen admirers trying to get his attention. Occasionally he puts his fingers to his lips, indicating that he is not supposed to talk.