The movie starts with an interview with director Claude Lelouch. He pleads viewers not to disclose the plot of the movie after leaving the projection room. Even the movie's trailer shows only a long sequence of faces gazing speechlessly in space. "Like all my movies, this one is about a man and a woman", says Lelouch in the interview.
| Actor | Role |
|---|---|
 Charlotte RamplingCatherine Perrin | Catherine Perrin |
 Michel PiccoliMichel Perrin | Michel Perrin |
 Jean-Louis TrintignantFrançois Gaucher | François Gaucher |
 Évelyne BouixSarah Gaucher | Sarah Gaucher |
 Charles AznavourEdouard Takvorian | Edouard Takvorian |
 Laurent MaletLaurent Perrin | Laurent Perrin |
 Tanya LopertJulia | Julia |
 Raymond PellegrinBarret | Barret |
 Charles GérardCharles | Charles |
 Anouk AiméeAnouk | Anouk |
 Myriam BoyerPauline | Pauline |
 Patrick DepeyrratTaxidriver | Taxidriver |
 Maryline EvenA Witness | A Witness |
 Philippe LaudenbachProfessor Sternberg | Professor Sternberg |
 Denis LavantCaviar delivery man | Caviar delivery man |
 Martin LamotteTV Journalist | TV Journalist |
 Ged MarlonBuilding contractor | Building contractor |
 Mado MaurinFrançois's Mother | François's Mother |
 Jacques NolotInspector | Inspector |
 Pascale PellegrinClaire | Claire |
 Claude LelouchClaude Lelouch (uncredited) | Claude Lelouch (uncredited) |