Zoé, a pretty penniless girl, decides on the advice of her neighbor to embark on gallantry. After a brief failure, she meets a young boy, Jacques Lebreton who is about to get married. After causing the failure of this arranged marriage, she will have to play the role of wife of Jacques with his family, until the arrival of the uncle from America.

A government agent tries to prevent foreign spies from obtaining a scientist's formula for a solid-rocket-fuel.

Maxime Bellac owns an art gallery. He has an affair with Michelle. One night when they have dinner together, Maxime tells Michelle he is forced to leave for the Canaries because of paintings. When they take a walk after their meal,a man suddenly appears, revolver in hand. In self-defense, Maxime kills him and,much to his surprise, recognizes a national security agent.Maxime confesses that he is in the pay of an eastern power; his mission is to get a file concerning Western nuclear weapons. Because of his crime, he cannot carry out his job; for Maxime's love, Michelle takes his place and becomes a spy.