Dominic Milne (Robson Green - Wire In The Blood, The Last Musketeer, Take Me) is engaged to Dee Stanton (Jemma Redgrave - Howards End, Bramwell) whose ex-husband is a serial killer serving a life sentence for murdering for young women. They are certain her 15 year-old son will add to their married happiness until a girl in his class is found strangled. Is this a case of Like Father Like Son.