John (Jared Harris) and Mary (Juliet Stevenson) have lived in an agonising limbo of grief and guilt for the past ten years. Their only child, Clare, ran away from home when she was fourteen and no trace of her whereabouts has ever been found.

When Clare (Erin Doherty) returns, now a young woman of twenty-four, Mary is overjoyed. But John comes to believe that Clare is not who she claims to be. As old tensions resurface, a gripping search for the truth unfolds.