Hopes and love and ambitions and friendship in a group of young jazz-loving Parisians.

Fates of multiple otherwise disconnected characters intertwine miraculously under the sky of Paris. And it all happens in one day.

Five college comrades are gathered in the property of one of them, Claude, whose parents have gone on a cruise. Despite minor domestic difficulties, the five boys get along well. Until the day when Anita, Claude's childhood friend, appears, whom he has not seen for ten years. He is still in love with her.

Antoine Rossi, a recidivist prisoner of war in Germany, manages to escape with the cowardly Fendard. Fendard does everything in his power to help him even though he is wounded, but Antoine tries to get rid of him as he boards the train to freedom.

Jeanne, mother of two children, loses her husband. She meets Pierre, abandoned by his wife.

After the murder of his wife Alexis is devastated. He withdraws all his savings and embarks on a journey from which he does not think he will return. His meeting with Daphne makes the escape through Tartary even crazier.

A GI on furlough attends a Folies-Bergères show. He falls in love with a dancer, Claudie, the star of the theater.

Roger, editor of a women's magazine, meets Roberte, his friend Jean's former mistress, at a major couturier's during a collection presentation. Roberte, who now lives in Florence with her niece Maria, asks Roger to arrange a student exchange so that Maria can come to Paris to perfect her French. Roger approaches Jean's son Philippe, a student at the Beaux-Arts, who agrees to go to Florence. Maria and Philippe meet on the platform at Pisé station. They miss their respective trains and take a walk together. A flirtation begins, then each goes back to the other. Jean finds Maria charming and, like an unrepentant Don Juan, decides to win her over, but thanks to his old maid, his intrigues come to nothing and Maria can marry Philippe.

Two bank robbers, an old and a young, escape from prison to get to the hidden loot.

In this uneven tragedy by director Philippe Ducrest, a misunderstanding brings out the murderous side of one of the protagonists. The popular Michel Galabru makes one of his early screen appearances as a thief who in his haste to escape from the law, stuffs a diamond necklace he has just stolen into a purse in a store. The woman who buys the handbag takes it home without inspecting its interior and leaves it where her husband notices it, opens it up, and sees the valuable necklace. Immediately jumping to the conclusion that his wife has been up to no good, his reaction leads to a separation -- and much worse.