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.

Jacques Loriot
Angèle
Albert
Brinchet
Le directeur des RG
L'employé du casino
Serge Vaudier
La gynécologue
La joueuse de Deauville - The Deauville Player
Louvin
Un inspecteur de la brigade
Joseph