Elsa and Laurent are very much in love and live with their teenage daughter Lucie in a small village in the Alpes-de-Haute-Provence. One morning, Elsa disappears whilst out jogging. As they begin to investigate, the police discover just how much she'd been hiding from her family.

Laurent realizes just how many grey areas there were in his wife's life. Who was the man she went to meet at the hotel? Who is the child whose photo she had always kept?