La coupure (Torn Apart) follows Christine, a seemingly ordinary woman married to a successful businessman and raising two adolescent children. Beneath the surface of her stable domestic life lies a dark, destructive secret: a passionate, ongoing extramarital affair with her brother, Christophe. Entangled in this forbidden, all-consuming taboo since adolescence, both siblings recognize the wreckage their toxic codependency causes. When Christine's husband earns a promotion requiring the family to relocate to a new city, she faces a agonizing ultimatum: finally sever the incestuous bond that defines her, or watch her family collapse under the weight of an inescapable illicit love.