This book provides a detailed account of the activities of Pakistani scientist, A. Q. Khan, the infamous international nuclear proliferator. The author, a security correspondent for British Broadcasting Company news, traces the complex story of Khan’s career and his global network for proliferation of nuclear technology. The first half of the book presents the development of that network, which enabled Pakistan to detonate nuclear weapons in 1998 and also to export technology to Iran, North Korea (DPRK), and Libya. The book analyzes Khan’s motivations, the global environment that allowed his network to flourish, and Khan’s relationship with the Pakistani government. The second half describes how the network was destroyed through intelligence and diplomacy. The author shows the difficulties of obtaining valid information and of using it to halt proliferation, problems that continue after the breakup of Khan’s operations. He concludes that while the Khan network was dismembered, it provides a model for future proliferation activities.