A candid memoir by a former U.S. counterterrorism operative that chronicles his undercover work and global investigations, blending fast-paced, firsthand accounts of surveillance, intelligence gathering and captures with sober reflections on tradecraft, interagency politics and the moral ambiguities of operating in the shadows; the book offers a behind-the-scenes look at how modern counterterrorism is conducted and the personal costs of a life spent hunting threats across borders.