Nightcap
Merci pour le chocolat (original)
Mika is the wife of celebrated pianist Andre Polonski and stepmother to his son, Guillaume, whose mother died in a car wreck on his sixth birthday. Their lives are interrupted by the unexpected arrival of Jeanne, a young woman who has learned that she was almost switched at birth with Guillaume whilst in hospital. Also a pianist, Jeanne harbors a suspicion that she may be Andre's daughter. Andre undertakes to continue her piano tuition, but, on entering the Polonski family, Jeanne begins to notice the icily controlled Mika behaving strangely. Her suspicions aroused, Jeanne begins the dangerous task of unraveling Mika's dark past of secrets and lies...
Starring Isabelle Huppert, Jacques Dutronc, Anna Mouglalis, Rodolphe Pauly, Mathieu Simonet, Michel Robin, Brigitte Catillon, Lydia Andrei, Isolde Barth, Véronique Alain
It's a crime and drama movie, and has a rating of 6.7 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Finland.