I must reflect, however, that the book raised questions for me, not so much about evil, not even so much about the murderers whose biographies were sketched but about the intent of the work. Yes, there is a foreword and yes, Professor Kernberg writes an afterword, but is this a work to 1) show others "what I have seen"; 2) illuminate those who have taken human life; 3) seriously categorize killers within Western culture; 4) elucidate the causes of evil behavior; or 5) maybe allow us to assure our own humanity and detachment from evil by affirming that we are just not like those people chronicled within? Certainly, the author accomplished item 1. I believe the minibiographies accomplish item 2. However, the grand masters of evil, those who have perpetrated political atrocities, such as Hitler and Pol Pot, are excluded from this "Murderer's Row." In regard to item 3, I did not find the 22 tiers of evil useful beyond being a filing system to keep track of the players. It did not go to the issue of etiology or pathogenesis (and I, too, have traveled that road), but I do not see the utility promised within Dr. Stone's scale. Regarding item 4, the book touches on the monoamine oxidase A gene and violence, on head trauma and violence, and on some psychophysiological and imaging examples, but there is a burgeoning and quite sophisticated literature on low serotonin, epilepsy, genetic variance, stress, and neuropeptides in the genesis of aggression, which are in the nascent states of research in the human animal but are not well reviewed in this volume. Regarding item 5, Stone allows us to escape with the smug assurance that we are not "they." I think inclusion of the work of Zimbardo's prison experiment or Milgram's shock paradigm would have provided a balancing warning that given the right circumstances we might all hold within our personal genome the attributes to become Cain.