Based on a true story. The story is set on the sweeping French countryside where Serge Duval (François Cluzet), a veterinarian, lives with his wife, Elisabeth (Brigitte Roüan) and their two young children. One day, their young son Olivier vanishes without a trace. Unable to accept the loss of her favourite child, the mother, Elizabeth, redirects her anguish and guilt at everyone. Little by little the fragile family falls apart. Six years later Olivier suddenly appears again, now as a teenage boy living on the streets of Paris, but is he really their missing son?