We are fascinated by evil--but what does science say about our darkest impulses? Why are we drawn to stories of serial killers, sadists, and sociopaths? What makes someone commit an act of cruelty or violence? And can evil truly be defined--or is it just a matter of perspective? In this provocative and deeply researched book, psychologist and criminologist Julia Shaw explores the science behind humanity's most disturbing behaviors. Blending neuroscience, psychology, and cultural analysis, Shaw examines everything from murder fantasies and workplace misbehavior to terrorism and artificial intelligence. She challenges readers to rethink what it means to be "bad," showing how empathy, context, and biology shape our understanding of morality. With gripping case studies, pop culture references, and cutting-edge research, Evil is a compelling journey into the minds of those we fear--and a call to confront our own assumptions about right and wrong.