Pierre is a hotel cashier in Vichy, so shy that he answers an ad from the Psychology Institute and can't say no to the salesman, Aldo; he spends 6,000 francs on tapes, books, and a punching bag. Soon after, he's smitten by Agnes, a hotel guest with a model's looks and photographers wherever she goes. When she leaves for Nice, he follows, meeting Aldo on the way. Aldo becomes his boldness coach. Pierre gets a job washing dishes where Agnes is staying, but after a week or so, she's off to Deauville, with Aldo and Pierre in pursuit. Using funds they get by selling Aldo's car, this time Pierre poses as a polo-playing jet setter. Will this win the heart of Agnes?

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

Two scriptwriters argue about the fate of Henrietta, a charming and gamine shopgirl. One favors a comical path for their heroine, who is overcome with sentimental love for a young photographer on Bastille Day. The other has a more thrilling and dastardly fate in mind for her. Among the film's irresistible conceits is Hildegarde Neff as an oversexed circus bareback rider.

In Bourganeuf, an old maid, Charlotte Bourdier, confesses to Marie Chassagne that she has forged a sentimental intrigue by correspondence with the presenter of the Radio Circus, Zappy Max. Marie agrees to meet him when he comes, but she in turn falls in love with him, who confesses his love to her.

A survivor of the Spanish Civil War who had been in French internment camps takes refuge with a family of winegrowers in the Jura. He becomes attached to this land that is not his own.

Four women were murdered, each was knifed and, though they had their clothes torn, they weren't molested. As the famed police inspector Jules Maigret pieces the clues together, he comes to realize that for the elusive man that he suspects to be unmasked, he has to set him a trap.

Young Monique leaves the preventorium where Doctor Delaunay has lovingly cared for her. A painful return. Her mother Denise lives with Eugène, a handsome, disreputable young man who's easy to please and, on occasion, won't hesitate to steal. He hangs around Monique, excited by her freshness, until the day he is shot on suspicion of the disappearance of a mobster. Monique is reunited with Dr Delaunay, much to the satisfaction of her guardian Gilbert, known as Patte-en-moins, owner of the local bistro.

Alain Brécourt, a former pilot who distinguished himself during the war, meets Françoise Clozat, a test pilot. They become lovers, but Françoise learns that Alain is married to a singer. Françoise despairs, but Alain proves to her that he has been living away from his wife for some time. She meets the singer, no longer believes Alain, and attempts suicide during a flight. Her instinct for self-preservation saves her. Alain is the first to turn his attention to her: when she opens her eyes again, she receives the assurance of his love.

Gaston Duboutois and Catherine Berton love each other, and are about to play Romeo and Juliet in their small provincial town. The industrialist Duboutois is opposed to his accountant Berton, both of whom are running for parliament. Tempers flare and invective quickly escalates. In the end, Duboutois wins and Berton loses his position. Although futile and foolish, it's the excellent Mme Duboutois who brings peace to the situation, brings about reconciliation and helps the two children to unite.

Fredo, a former gangster nicknamed "The Bluffer", has just been released from prison and is now thinking of going into the legal world with a friend. But his ex-partners are desperate to find him, to punish him for operating without their cooperation. His fortune is stolen and he is accused of a diamond robbery perpetrated by the old gang.