Having fortuitously discovered a photograph in which Marthe embraces someone unknown, Étienne Dorsay becomes jealous and imagines various stratagems to identify the lover. In the meantime, he and his friends acquire a weekend house for a very low price.
Jean Rochefort
Etienne Dorsay
Claude Brasseur
Daniel
Guy Bedos
Simon Messina, doctor
Victor Lanoux
Boulifet, aka 'Bouly'
Danièle Delorme
Marthe Dorsay, Étienne's wife
Marthe Villalonga
Mouchy Messina, Simon's possessive mother
Jenny Arasse
Bernadette, designer collaborating with Étienne
Josiane Balasko
Josy, Lucien's girlfriend
