Passionate, courageous, and at times controversial, is a ground-breaking work that will challenge your core human values and perspectives on violence. Why do some kids from good environments become mass murderers? Is there actually such a thing as a natural born killer? And, if so, what can we do to identify and treat those born with a predisposition to criminal behavior? For more than three decades Adrian Raine has sought answers to these questions through his pioneering research on the biological basis for violence. In this book, he presents the growing body of evidence that shows how genetics and environmental influences can conspire to create a criminal brain, and how something as seemingly innocent as a low resting heart rate can give rise to a violent personality. Bristling with ingenious experiments, surprising data, and shocking case studies, this is also a clear-eyed inquiry into the thorny ethical issues this science raises about prevention and punishment.