In February 2011, Lorna Smith starting dating her ex-partner's best friend, Clifford Mills. At first, their relationship seemed fine, but things turned sour when Mills became incredibly controlling. Lorna decided to break up with him, but he wasn't willing to let go of the control he had over her. His madness starts with stalking and ends in murder. Britain’s Darkest Taboos tells the stories of some of the most shocking and disturbing crimes within families and relationships. Every family’s worst nightmares are relived and re-told in unflinching detail by those left behind – by the families and friends, and by others whose lives have been touched - like the police officers and reporters involved in the cases.