This murder mystery is set in a Parisian cafe and examines the mysterious murder of a famed journalist and extortionist who is killed at his table in the cafe. Though the prime suspects are gathered together( including his wife and her lover, the gun-runner, the creditor, and a playboy) and all of them have motives, none of them did it. So whodunit?

Duparquet is the controller of Les Halles, and plays matchmaker between the young farm-girl Ciboulette and Antonin, a young spoiled aristocrat.

Two bank employees like Lucie, their colleague. They steal money from the cash register to gamble. Jean wins and Paul ends up in prison for five years. When he leaves, he discovers that Jean has become a businessman and that he has married Lucie.

Claude is a young man whose girlfriend has just broken up with him. Feeling unable to overcome the pain, Claude has no other idea than to end his life. Back home, he finds five middle-aged or elderly men sitting at the dinner table but he refuses to join the guests and goes upstairs to his bedroom. The worst is prevented thanks to a servant who has caught sight of Claude's revolver. Claude 's uncle joins his nephew and manages to persuade him not to take action. He takes him downstairs to the dining room where each in turn, the five guests start telling their own story. For it happens that they too once had their heart broken and that they too once wanted to die for love.

A poor wretch, who has just been hired as a music-hall artist, in spite of himself becomes the tenant of a particular Parisian building.

Félix Raffut, a Périgord squire terrified by the German invasion, carries out the exodus of his family and his furniture towards supposedly hospitable places.

Before the war. Mr. and Mrs. Boisleroi, well off, lived in their castle while their son Jacques courted Geneviève, the manager's daughter. On mobilization, the manager becomes flight captain, Boisleroi a simple waykeeper and Jacques wants to enlist. Refugees arrive: an actress, a player, an old marquis, former owner of the castle and who will die there. All this life together culminates in the marriage of Jacques and Geneviève.

In the elevator of two large Parisian buildings, a telegraph operator discovers the body of an elderly woman, Madame Mathieu, the owner of both buildings. Boucheron, the local superintendent, is dispatched to investigate, along with his rival, Inspector Lambert of the "Sûreté". To solve the enigma, they scour staircases and corridors, visiting every floor of both buildings, courtyard and facade. Their gruff rivalry allows them to complement each other in discovering who committed the crime among a gallery of characters, humble or rich, who all have something to be ashamed of... A rare, fast-paced, picturesque comedy set against the backdrop of a police mystery.

Following a broadcast on the radio, each of the listeners remembers these "little nothings" (the title is borrowed from a play by Mozart), which have often changed their lives. Each of these stories told will prove that a tiny detail in life can change an entire destiny.

The forbidden romance between wealthy Giselle Preville and impoverished journalist Claude Dauphin. When Preville disappears, Dauphin is accused of kidnapping by the girl's snobbish father Rene Alexander. By the time the Normandie reaches New York, however, the "mystery" is solved and all misunderstandings blithely swept away.