Nightcap (2000)

Mika, heiress to a Swiss chocolate company, is married to celebrated pianist André and stepmother to his son, Guillaume, whose mother died in a car wreck on his tenth birthday. Their lives are interrupted by the unexpected arrival of Jeanne, a young woman who has learned she was almost switched with Guillaume at birth.

Directed by: Claude Chabrol

Starring: Isabelle Huppert, Jacques Dutronc, Anna Mouglalis, Rodolphe Pauly, Brigitte Catillon, Michel Robin

Links: IMDb, Movie posters, Movie stills