Cathy was just sixteen, and living on her own, when she met a charming older man called Peter Tobin. She saw him as a knight in shining armour, a man who made her feel safe. He saw a vulnerable girl whose troubled childhood made her the perfect victim. This considerate man, who appeared so normal to anyone who met him, became first controlling, then violent, and Cathy found herself trapped in a terrifyingly abusive marriage. Eventually, for the sake of her young son, she found the strength to escape and over the years managed to create a good life for her boy, making sure he never had the memories of fear and daily trauma she had suffered. Still Tobin remained a threatening presence in the background. Then, turning on the television set in 2006, she screamed with horror when a familiar face appeared on the news. Her ex-husband, her son's father, was a serial killer.