In this book, James Sias investigates the psychologies of those who have acted in ways widely regarded as evil, and uses this psychological data as a basis for developing his own theory of evil. Sometimes, he claims, an action is so horrific and despicable that a term like “wrong� seems to fall short of capturing its moral status. Likewise, occasionally a person character is corrupt in such a way that ordinary trait terms like “selfish� or “insensitive,� or more general labels like “bad� or “immoral,� seem inadequate. In such cases, we often resort to calling the person or action “evil.� But what does this term mean? What is it that makes a person or action morally evil? Taking a cue from Hannah Arendt, Sias argues that this sort of evil is essentially a matter of regarding others as “morally superfluous.� In other words, evil is a matter of utter moral disregard. In the course of developing and defending this view, Sias also describes and critiques a number of prominent theories ofevil proposed by philosophers in recent years.