absence of a description of government activities online sometimes creates a sense that terrorists have free rein online rather than being engaged in a long- term strategic interaction with other online actors, such as governments, which is not true, as Weimann reveals more clearly in later chapters. The sections devoted to answering the second and third questions are found in Chapters 9–11 and are best thought of as prescriptions by a leading expert in the field based upon his experience. Weimann draws upon established ideas on the role of media in conflict to prescribe ways that governments and private actors can challenge and potentially defeat terrorists online. Of special rele- vance is the discussion of how governments have responded to terrorism found in Chapter 11, not just because it provides the most in-depth discussion of government strategy in the book but also because of the thoughtful consider- ation of how these strategies affect civil liberties. No better description of terrorists’ online actions currently exists, and any scholar or policymaker who hopes to understand what terrorists are doing online should start with this book. The tone and tenor of the book make it a welcome addition to scholarly work, as it is simultaneously academic and yet appropriately structured for use by policy readers. Because of the scarce discussion of government activities, readers and teachers who want to create a complete description of the strategic interaction between terrorists and governments should pair this book with governmentally centered writings. Although the subject matter is likely too narrow for the whole book to be part of an introduction to international security, the chapters are sufficiently self- contained that appropriate chapters could be included as reading, and the book should certainly be included in any study of terrorism or Internet politics. Because the online situation is so fluid and empirical information is difficult to come by, we should hope that Weimann will continue to update this book, and if future editions become available, prudent students and scholars should avail themselves of the latest copy for the best possible information. DAVID BENSON University of Chicago To Kill Nations: American Strategy in the Air-Atomic Age and the Rise of Mutually Assured Destruction by Edward Kaplan. Ithaca, NY, Cornell University Press, 2015. 272 pp. $39.95. Edward Kaplan seeks to explain “the rise and fall of air-atomic power in the early Cold War” (p. 6). He accomplishes this and more, providing a book that should be widely read by students of nuclear strategy. The broad elements of the story are familiar. Yet the devil is in the details; terms such as “massive retaliation” and “assured destruction” are used imprecisely by many scholars. 660 | POLITICAL SCIENCE QUARTERLY