Christine is desperate to recover her 17-year-old son, Tristan, who has run away from home. The police are making no headway, and Paul, the father, hasn't got the strength of character to look for his son. So, Christine invents a huge lie. She calls her two childhood lovers, Lucas and Pignon, men whom she hasn't seen for twenty years. And in order to force their hand, she tells them that Tristan is their son.