1935. A mother's journey to find out what really happened to her only daughter. What would you do if you saw a girl in a crowd whose face had the same, identical birthmark as your only child? A child who, nearly ten years ago, you were told died? It's 1935 and housewife Emma glimpses a face in a crowd – a little girl with a very unique birthmark. Transfixed by the sight of a stranger; Emma becomes convinced that the girl is her long-lost daughter taken from her at birth. There is only one problem: Emma's daughter is dead. So who is the stranger? The Liar follows Emma's journey as she tries to find out what really happened to her daughter – a journey that unearths secrets from the past and ends in obsession...