Merci Pour le Chocolat (2000)

After the death of his second wife, concert pianist André Polonski remarries his first wife, Swiss chocolate-company heiress Mika Muller. Soon a young piano student, Jeanne Polet, gets the idea that she may be André's daughter. She visits his house in Lausanne, gets to know André's son Guillaume who was born on the same day as she, and starts taking piano lessons from André... (imdb)
Cast and Information
Directed By: Claude Chabrol
Written By: Claude Chabrol, Charlotte Armstrong, Caroline Eliacheff
Starring: Isabelle Huppert, Jacques Dutronc, Anna Mouglalis, Michel Robin, Brigitte Catillon, Isolde Barth, Rodolphe Pauly, Mathieu Simonet, Véronique Alain, François Germond, Lydia Andrei, Jacqueline Burnand
Genres: Drama, Suspense/Thriller
AKA: Nightcap
Country: France, Switzerland