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.
Etienne Dorsay
Jean Rochefort
Daniel
Claude Brasseur
Simon Messina, doctor
Guy Bedos
Boulifet, aka 'Bouly'
Victor Lanoux
Marthe Dorsay, Étienne's wife
Danièle Delorme
Mouchy Messina, Simon's possessive mother
Marthe Villalonga
Bernadette, designer collaborating with Étienne
Jenny Arasse
Josy, Lucien's girlfriend
Josiane Balasko
Marie-Ange, Bouly's ex-wife
Anne-Marie Blot
Daisy, Bouly's fiancée
Elisabeth Margoni
Delphine, Étienne's younger daughter
Pascale Reynaud
Madame Chalamand, Simon's lover
Maïa Simon
Stéphanie, Étienne's older daughter
Catherine Verlor
Bully
Jean-Pierre Castaldi
Banoît, Marthe's lover
Vania Vilers
Bastien, stage director
Daniel Gélin
Marie-Christine Bosquet, Daniel's director
Gaby Sylvia
Lucien
Christophe Bourseiller
Mireille, Simon's girlfriend
Carole Jacquinot
Taxi driver
Claude Legros
Bouly's secretary
Janine Souchon
Philippe Chemin
Paul Descombes
Marc Françoise
André Lambert
Elisabeth Rambert
Skinny colleague / Waiter (uncredited)
Michel Bonnet
Violinist at Mouchy's party (uncredited)
Vladimir Cosma
Radio news host (voice) (uncredited)
Philippe Gildas