Zimbardo is mainly (in)famous for the Stanford Prison Experiment. This book goes further, and explains how ordinary people are capable of evil acts. Zimbardo gave evidence at the trial of the Abu Ghraib torturers; this book explains his thinking on one of the most important psychological issues that there is.
“I summarize more than 30 years of research on factors that can create a “perfect storm” which leads good people to engage in evil actions. This transformation of human character is what I call the “Lucifer Effect,” named after God’s favorite angel, Lucifer, who fell from graceand ultimately became Satan. Rather than providing a religious analysis, however, I offer a psychological account of how ordinary people sometimes turn evil and commit unspeakable acts.”