This new edition of John Horgan's critically acclaimed book is fully revised and updated and contains three new chapters. The book presents a critical analysis of our existing knowledge and understanding of terrorist psychology, and in doing so, highlights the substantial shortcomings and limitations of the nature and direction of current research. In so doing, it presents a unique model of involvement and engagement in terrorism by considering it as a process and exploring three distinct phases of the making of a terrorist: becoming involved, remaining involved (or 'being' a terrorist), and leaving terrorism behind. Despite the ongoing search for a terrorist personality, the most insightful and evidence-based research to date not only illustrates the lack of any identifiable psychopathology in terrorists, but demonstrates how frighteningly 'normal' and unremarkable in psychological terms are those who engage in terrorist activity. By producing a clearer picture of the complex processes that impinge upon the individual terrorist, a different type of terrorist psychology emerges, one which has controversial implications for efforts at countering terrorism in today's world. This new edition of The Psychology of Terrorismwill be essential reading for students of terrorism and political violence, and counterterrorism studies, and recommended for forensic psychology, criminology, international security and IR in general.