A beautiful and sophisticated teenager is placed in a regimented French girls' boarding school after her father apparently commits suicide over a business scandal. She immediately gains admirers -- a lustful middle-aged artist, a handsome young composer, a fellow female student -- as well as a jealous rival. With the help of her schoolmates, she attempts to elope with the composer, but the adults catch on to the plot, and she is locked into her room at night.
Madeleine Villardier is terribly superstitious, and she's in a lot of trouble for the New Year's Eve party she's planning. Inexorably, the number of guests is down to thirteen. To add to her dismay, the presence under her roof of a certain Consuelo is proving cumbersome, especially as this lady has revelations to make about Antoine Villardier's stormy past. The mistress of the house's trances alternate with marital explanations. But why not consider the fateful number as a lucky charm?
Julien Couturier and his wife Louise, a young couple from Auvergne who have come to Paris to try their luck for the first time in their lives, become the owners of the "Café du Cadran" ("Clockface Cafe"). On opening day, they meet the people who will become their clientele. It's a busy place, with regular customers served by two waiters, Jules and Victor. While Julien is comfortable in his role as boss, Louise doesn't quite get used to this urban world, where everything moves faster, especially human feelings. She often misses Marcenait, the village in Auvergne where she and her husband ran the "Café du Commerce". Mr. Luigi, a café customer and violinist who performs at the "Café de Paris", has undertaken Louise's cultural education. He teaches her how to dress and do her hair, while recounting his musical successes and travels, skilfully playing on his undeniable seductiveness...
Pursued by the police, Saget usurps the identity of a man who was returning to his town after having made his fortune in the United States. Under this new name, he deceives his compatriots with the exception of a doctor and the savage Isabelle. During an explanation Saget understands that Isabelle secretly admires him. She denounces him and Saget surrenders without a fight. Thus he ruins all his prestige with the young Amazon.
