Irène is a beautiful girl working in Paris, she soon meets a manager and hopes a love story with him. But he tells a lie, so she falls in love with a house painter.
Luisa lives with Mathieu, the man she loves, and Arthur, Mathieu's son by his first wife, who died in an accident. But Arthur, whom Luisa has been raising like her own, suddenly disappears from school and no one claims a kidnapping.
The Stievenart family decides to spend their vacation far away and puts an ad on the internet. The Mailon family responds by offering to exchange homes. But the Stievenart family has an environmentally friendly house, while the Mailons consume a lot of energy.
