Lisa (Diane Kruger) and Julien (Vincent Lindon) are married and lead a happy uneventful life with their son Oscar (Lancelot Roch). But their life radically changes one morning, when the police comes to arrest Lisa on murder charges. She's sentenced to 20 years of prison. Convinced of his wife's innocence, Julien decides to act. How far will he be willing to go for her?