Just as Elizabeth is about to leave for a holiday in Touquet, an opulent seaside resort, her husband, Bertrand, pretends to have too much work to go, but really, he’s remaining in
Paris to be near his lover, Rena. Julie, a single young mother who was once Bertrand’s mistress, agrees to accompany Elizabeth instead. Émilie, Bertrand and Elizabeth’s daughter, flies to Boston with Kevin, an employee of her father, while making her parents believe she’s with a girlfriend. In Touquet, Elizabeth sympathizes with Lulu, whose husband is the extremely jealous Jean-Pierre. Jean-Pierre is convinced that his wife is having an affair with the seductive Maxime, who is interested in Julie instead.