In the quiet streets of Gloucester, a seemingly ordinary couple, Fred and Rose West, harbored a dark and terrifying secret that would shock the nation. Behind the walls of their home on Cromwell Street, they engaged in a series of horrific crimes, including rape, torture, and murder, that went undetected for over two decades. This documentary explores the twisted relationship between the two, their upbringing, and the events that led them to become two of Britain's most notorious serial killers.