What makes good people do bad things? How can moral people be seduced to act immorally? Where is the line separating good from evil, and who is in danger of crossing it? Renowned social psychologist Philip Zimbardo has the answers, and in The Lucifer Effect he explains how---and the myriad reasons why---we are all susceptible to the lure of "the dark side." Drawing on examples from history as well as his own trailblazing research, Zimbardo details how situational forces and group dynamics can work in concert to make monsters out of decent men and women.