A publicity-minded French mayor reunites quintuplets and their earthy father, all six played by Fernandel.

Four little girls flee the cold concrete world of the housing project they live in, take refuge every evening in a house on an island in the middle of the Marne River. It is secret hideaway that no one should trespass. Unfortunately a big girl reveals everything to the schoolmistress and scandal breaks out. But it is Sophie, the youngest of the group, who gets suspected by her..."friends".

Justin, a lyricist by trade, and his friend Pierre, a composer, lead a bohemian life in Paris. Justin thinks his mother Josefa is richer than she appears, and decides to swindle her out of three million centimes by using Pierre as an intermediary in a case involving an insolvent check. Josefa uncovers the ruse and refuses to help her son. However, Pierre has discovered the identity of his friend's father, who had been unknown to him for twenty years. With the help of Justin's mother, the two friends do everything they can to extort the son's missing three million centimes from his ashamed and repentant father.

Ten young people (six boys and four girls), most of whom students, rent a house in bad repair and set about living together. The experience is not obvious and the ten tenants have to cope with more than one difficulty. But they also have their moments. Things really go awry when Françoise, an unmarried girl, is forced to deliver the baby she carries prematurely and when Solange, the lonely girl of the group, attempts suicide. Shortly afterwards, the group learns that the house is due for demolition. They decide to take advantage of this opportunity to face adult life individually.