Jeanne, Achille, and their family belong to the middle class. They have their own house. Their marriage has not always gone smoothly, but they both make up for it. Then they both lose their jobs, and the incredible happens: the house is sold and they become homeless.
Henri Verdier, a young bank manager, has made the acquaintance of Karine, a model of great beauty. Robert, who claims to be Karine's brother, forces Karine to introduce him to Verdier. This is to offer him an urgent business deal: 50 million for a uranium purchase which, within a few days, should yield double that amount. Blinded by passion, Verdier accepts and "withdraws" the necessary sum from his bank. He soon realizes he's been duped. Karine is not Robert's sister and Robert is a crook. Verdier tracks them down.
Scientist André Ségonne hits the headlines with his discovery of anti-matter. On his way to a few days' vacation, he is involved in a motorcycle accident. Rescued by Piort and Florence, a strange couple, André is taken to their equally peculiar house: an inexplicable power seems to emanate from it.
Relations between middle-aged businessman Arthur Dahlberg and his young wife Anja are not at their best. So it occurred to them to leave their Hamburg home and go on vacation to the Côte d'Azur to revitalize their relationship. But Arthur Dahlberg, even on vacation, is obsessed with running his business. Meanwhile, Anya meets the young writer Roy Benter.
In love with Roxane, who is herself in love with the youngest son of Gascony, Christian de Neuvilette, Cyrano dictates his words of love to the young man. But the Count de Guiche, an unhappy rival, takes revenge by sending Christian and Cyrano to the siege of Arras.
Robert and his fiancée Lucienne were due to go on vacation together to a tented village in Sicily. Robert is forced to postpone his trip and only joins Lucienne a few days later, taking advantage of the departure of a following group. During the train journey, he befriends Thérèse, a young Sicilian living in Paris, who wants to make a pilgrimage to the land of her ancestors. Lucienne is away from the camp when Robert arrives, so he can continue to see Thérèse, and little by little they discover that they love each other. When Lucienne returns, an explanation and reconciliation take place, then Robert changes his mind and, with the vacations over, leaves Lucienne alone to live in Sicily with Thérèse, who wants to stay in her family's homeland.
Stuck in a loveless marriage, bourgeois industrialist Francois falls in love with Janine, another man's wife. Francois sets up Janine as his mistress, and she, mercenary soul that she is, likes the set-up so much that she continues the relationship even when her own husband returns from WW II. In the long run, however, Janine is the loser in the situation.