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.

A young duke marries a girl, also penniless, and moves into a bus left him by an uncle, with their ten children. At last he finds the bus is made of solid gold.

A precious work of art from the Italian Renaissance is stolen and passes through many hands before ending up in the shed of the farmhouse of Mr. and Mrs. Dujardin, fishmongers, who are inaugurating their luxury fish shop that very day. But the antique dealers, the free-riders and the bargain-hunters are there. They are jealously careful not to pass on the fruit of their clever investigations to their rivals, for all of them, after a picturesque treasure hunt, know that the Dujardin family own the famous Duranti altarpiece. But where have they hidden it themselves?