This book draws on findings from psychology, neurology, and genetics, to offer a multi-dimensional analysis of criminal behavior. It explores the biological bases of emotions such as aggression, anger, and hostility and how they-- combined with social psychological influences, such as family history and environmental conditions-- may lead to violence. Specific case studies, including serial killings, mass murders, family violence, cannibalism, and hitmen, are referenced throughout, providing real-world examples of these theories in action. Issues of free will and the law are discussed as well as suggestions for curbing violent behavior.