A broken marriage leads to a bitter custody battle with an embattled son at the center of Custody, a domestic thriller that will keep audiences guessing and leave them with their hearts in their throats. Miriam and Antoine Besson have divorced, and Miriam (Lea Drucker) is seeking sole custody of their son Julien (Thomas Gioria) to protect him from a father she claims is violent. Antoine (Denis Menochet) pleads his case as a scorned dad whose children have been turned against him by their vindictive mother. Unsure who is telling the truth, the appointed judge rules in favor of joint custody. A hostage to the escalating conflict between his parents, Julien is pushed to the edge to prevent the worst from happening.