In Juan-les-Pins, Serge drops off a hitchhiker, Sylvie, who joins "Théo's gang", a group of students and workers, all young, all broke, improvising their vacations from day to day. Among them, Serge meets Helle, a discreet young girl with whom he quickly falls in love, but whom he can only win over once he's sorted out his many problems with the wrong people.

Pierre is an engine driver who adopts a small girl, a WWI orphan. A widower, he sees in her the image of her mother.

A dying man entrusts 25 million to a young girl's care, but she's afraid of being suspected of theft.

Barbara Van Looren is the lively, clever daughter of the well-known shipowner. For her, life is a breeze, even when she's kidnapped by Mike Cortez's men. A young journalist, Mercier, who tried to defend her and was forced to follow her, doesn't share her optimism and manages to escape. Barbara is sequestered because her father has caught wind of a diamond deal. If he renounces the customs action, his daughter will be returned to him. Mercier, with the help of a couple of loyal friends, discovers the instigator of the traffic, a member of the board of directors, and finds Barbara, still as petulant as ever.

When Nathalie, a shoe seller, is abducted, her mother Flora wastes no time taking matters into her own hands. Reluctant to call in the police, she galvanizes her three other daughters into action.