4 young people are long time friends. They have a dinner together, which will turn into a mess when they play a game which consists in writing a vow on a little piece of paper to be put into a bottle: they love each other, but they are not able to transcend their loneliness and their selfishness.

Serge Vaudier, a mathematics teacher, wins the lotto twice and claims he can do it again, thanks to an infallible system he has designed. Is a he genius or a con man? Angèle, the head of the the government's bureau, is determined to entrap him. She asks her secret lover, Jacques Loriot, an expert player in the casinos, for help.