Jeff Gordon, FBI agent, infiltrates a gang and finds himself in the midst of a gang war.

During a plane crash, Professor Sellier, an atomic scientist carrying very important documents, dies and his papers are stolen. Bordy, a sergeant in the Second Bureau, is asked to take Sellier's place in his family's home, in order to make the kidnappers believe that he is not dead.

Catherine Langeac and André Foucaud are a medical couple, she a general practitioner and he a gynecologist. Their attentiveness and understanding enable them to solve many of their patients' problems.

A legionnaire, Georges, promised his friend, who died of a snake-bite, to marry Catherine, the girl with whom he had a child. Back in France, the young soldier goes in search of Catherine. The girl he finds is a dumb puritan; in spite of his disappointment, he keeps his promise and asks for her hand. At the last moment, in the town-hall, he discovers the girl he is to marry is not the true Catherine. So he leaves his fiancee and heads for Paris where the true girl works as a cabaret dancer. But the deserted fiancee is not prepared to accept it.

Manuel, a landowner in Jamaica, arrives in Paris on vacation. There he meets Olivia, a Spanish popular singer and falls in love. Olivia leaves Paris to play in a casino of the Riviera and Manuel follows her there. Maxime lives in Cannes, uncle of Olivia, a trickster who poses as a magician and has great influence on Annie, an eccentric billionaire. At the same time, Simeon, Annie's secretary tries to bribe the magician to influence Annie to accept to marry him, but as Maxime also wants to marry her, Simeon uses the services of a private detective. Manuel receives a telegram asking him to return to Jamaica. So, Annie proposes them a cruise aboard his yacht and invites Olivia.

Mario, a star ladies' hairdresser, has Nicolas as a friend and Gisèle as his mistress, who is coveted by Nicolas. To boost the salon's finances, Nicolas takes advantage of a billionaire, Madame Alvarez, by selling her a pseudo-rejuvenation serum invented by Mario. Mario suddenly falls in love with a provincial girl, Gabrielle, and pursues her to the South of France, where everyone meets up to finish the film in song.

A story of the love of Frou-Frou - an actress and singer in the in the beginning of her career.