This is the extraordinary untold story of how the two most notorious women in British crime, Rose West and Myra Hindley, became lovers in jail, and how their weird life behind bars gives terrifying new insight into crimes that shocked the world. Myra Hindley was labelled the most evil women in Britain for her part in the Moors murders of the 1960s, when she and her boyfriend Ian Brady killed five children, burying bodies on moorland near Manchester. While together with her husband, Fred, Rose West became an even more prolific serial killer in the 1970s and '80s, killing 10 women and girls. Former Category A prisoners including reformed Mafia member Marisa Merico and ex-gangster Linda Calvey tell Sir Trevor McDonald how Rose West revealed her murderous temper in prison, her jail rages giving vivid insights into how a woman described as looking like a 'Tesco Mum' could have killed.