Karla picks up where Williams's first book on the case, Invisible Darkness, left her, painting her nails in her cell in solitary confinement in the gothic tower of Kingston's Prison for Women. After testifying against her ex-husband in 1995, Karla's life in prison was soon going to take a very different, dramatic turn. With a thriller's pace, Karla: A Pact with the Devil charts the inner life of the world's most notorious female prisoner. In Karla, Williams lets Karla and the other key players speak for themselves. And what they have to say will surprise, horrify and enlighten.