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.

Sur la Cote d'Azur, des groupes de jeunes, étudiants, ouvriers, tous fauchés, s'amusent pendant les vacances, improvisant a chaque instant le programme de leurs loisirs. Certains, comme Serge, Hellé ou Théo sont vite fatigués des abus. D'autres, comme Peggy, craquent. Serge, lui, est amoureux de Hellé...