"The nature of the crimes, the sheer depth of evil makes this as terrifying a read as any thriller and worse, the villains are real." -- Monsters and Critics.com For centuries, evil has been the domain of philosophers and priests. Now, science finally reveals its true anatomy. Drawing from over 600 criminal cases, Stone unveils a groundbreaking 22-level hierarchy of evil behavior, examining how narcissism and aggression drive the most disturbing acts in human history. This isn't just theory--it's a practical tool that could help predict and prevent violent behavior before it takes root. As the host of Discovery Channel's "Most Evil" and a distinguished Columbia University professor, Stone brings unprecedented clarity to humanity's darkest mystery. His research offers hope that by understanding evil's origins, we might one day prevent its worst manifestations. Praised by experts and cited in major media worldwide, this essential work transforms our understanding of human nature's darkest side. "Psychiatrist Stone...provides an etymology of evil with case studies of over 600 violent criminals, giving readers a comprehensive picture of the nature and varieties of human evil.... useful to those seeking the neurological and psychiatric reasons people commit 'evil' crimes."--Library Journal