Based on

Movies like La part de l'autre (1987)

Two twin brothers, Romain and Sylvain, live together in an isolated house by the ocean. Between them, violent relationships that oscillate between love and hate. The guardians of the house watch, fascinated and powerless, their dangerous games. Until the day when Hélène, who has already lived with them, returns to look for Sylvain, with whom she has chosen to live.