A mother who has recently been incarcerated refuses to give up on her young son, no matter how fragile their connection may now be.

Pauline goes on trip and never returns. Did she deliberately vanish, or did she just abandon her life, or is this an invitation for someone to start searching for her? Simon, her fiancé, intends to find out... Several months after the disappearance, Simon learns of Pauline's death abroad. While cleaning out her apartment, Simon discovers that Lazare, Pauline's cat, still occupies his master's apartment. He possesses an extraordinary long-term memory... and a need for revenge!