During Madeleine's fashion show Claire meets Antoine and becomes his mistress. Due to the fact that she's married (to a wealthy man) she only spends a few days a week with him. Antoine is also rich, and often taken to meetings by his chauffeur, Marius. However things are more complicated: Antoine is Madeleine lover (Claire's best friend) while George, Claire's husband is quite rich and has a modest job. Everything works perfectly until Madeleine discovers the truth. She prepares her vengéance and organizes a celebration which she invites Antoine, Claire and George.