Bob Hunter details his investigation into the John Walker spy ring, the most damaging espionage case in U.S. history. As a lead FBI counterintelligence agent, Hunter was uniquely positioned to track the U.S. Navy communications expert and his collaborators from inception to capture. The book offers an insider's perspective on the intricate network, including Walker's son, brother, and best friend, and delves into the complexities of interviews with his wife and brother, exploring the agency's doubts about the latter's full confession. Hunter provides unprecedented access to interviews with the supervising KGB general and the legal professionals involved, offering a close-up view of the investigation's progression and the lead investigator's thought process in apprehending a significant traitor.

This book is regarded as a definitive insider account of one of the most significant espionage cases in American history. The author's unique position as the lead investigator from start to finish provides unparalleled depth and perspective. It is noted for including detailed interviews with key figures, some of which are published here for the first time, offering a comprehensive look at the investigation's intricacies and the psychological aspects of the case. The narrative is praised for its detailed examination of the investigation's process and the personal thoughts of the lead agent.