From Anders Breivik in Norway, who murdered scores of young people in a bombing and mass-shooting attack, to Omar Mateen, the Orlando killer who perpetrated the worst mass shooting in American history, lone wolves have demonstrated that they can be as dangerous as organized terrorist groups. Who are these terrorists and what can be done about them? An internationally renowned terrorism expert presents the first comprehensive treatment of this important issue. After delving into the diversity in motivations and backgrounds of lone wolf terrorists, Simon makes the following key points about this growing threat: lone wolves have proven to be more creative and dangerous than many terrorist groups; lone wolves are not just Islamist extremists but can be found among all types of political and religious ideologies; the Internet has provided the perfect breeding ground for isolated individuals with terrorist tendencies, but it may also prove to be their undoing; there are few women in this category, but this is likely to change in the coming years; and the common perception that nothing can be done about lone wolves is wrong. In fact, innovative strategies and policies can be developed to both prevent and respond to this type of terrorism. Drawing on his more than twenty-five years of experience studying terrorism, Simon has produced an insightful book that is essential reading for anyone concerned about the potential terrorist threats from violence-prone individuals in our midst.This paperback edition contains a new preface by the author, which reviews lone-wolf incidents since the publication of the original edition.