Two young men, one shy and one self-confident, spend a fast-paced night in Paris trying to pick up chicks. They confront every possible difficulty

Moïse, a foundling, is raised by the inhabitants of a village and grows good and strong, well-liked by everyone, loved in silence by Agnese, a girl in the same conditions. One day, however, four graceful Parisians come to the village for a short vacation, and with their light-hearted behavior, they upset Moses and the villagers, who are quick to make the unwelcome guests return to the capital.

Determined to assert his paternal rights, Quentin leaves his small village on the Swiss border to go to Lyon to look for his daughter, now a hairdresser, who, busy with her work, hasn't been back to the village for two years. In a few days, it will be Denise's birthday, the youngest of his daughters, and, urged on by his wife, he sets off, determined to bring the prodigal son back to the family celebration. But Denise is now living off her charms.

Three young students, who met on the train, arrive in Paris and decide to find accommodation together.