Evil serial killers

"To kill is one of the greatest crimes against humanity--to kill repeatedly, accompanied usually by sexually motivated acts that are also taboo, is beyond human comprehension. Why do these people do it? What motivates them? Wildly deviant behaviour can sometimes be 'undrestood' when it is displayed by a lone madman, but what about the killers who are judged normal, or those who act in despicable agreement with others? Charlotte Greig addresses such difficult questions in this compelling examination of the crimes of fifty of the world's most notorious serial killers."--From inside flap.