Mr Lucas, a grocer, wants to attract the clientele; he imagines a lottery; every week, you can win a bike. It's a big success.

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.

Dr. Lucien Petypon is usually a serious man, but, drawn by his friend Corignon, he once paints the town red at Maxim's. When he wakes up late the next morning, he finds the scantily clad Môme Crevette, a dancer at the famous Paris restaurant, by his side. It is the moment General Petypon du Grêlé, Lucien's rich uncle, chooses to make an unexpected visit. The good doctor has no other choice but to pass Crevette off as his lawful wife.