Yonah Alexander and Dean Alexander’s book The Islamic State: Combating the caliphate without borders adds an interesting addition to the growing canon on the Islamic State (IS). It sets out to ‘address the current gap in realistic assessment regarding the IS threat, the risk it poses, and its broader implications at national, regional, and global levels’ and it does so by meticulously tracing the group’s tactics and strategy. In doing so, Alexander and Alexander rely heavily on data extracted from statements by government, military, and law-enforcement officials as well as newspaper sources. They compile an impressive and thorough amount of data to evaluate the current threat by the IS.... The Islamic State provides an invaluable resource for further research, thoroughly mapping both attacks by the IS as well as counteractions taken by the international community.

Behavioral Sciences of Terrorism and Political Aggression

[T]he book can be likened to a handbook in that it provides a comprehensive reference tool of matters relating to IS and the authors have successfully simplified and contextualized complex concepts throughout their analytical overview. The vast reference lists that follow each chapter are testament to the breadth of research and knowledge that has been integrated into this piece of work, which is evident in its reading.The Islamic State: Combating the Caliphate without Borders is a valuable resource that serves to educate readers who are unfamiliar with aspects of IS or, alternatively, consolidates and builds upon the existing knowledge base of the target audience. Its contents can be useful to a wide range of people, including scholars, policymakers, law enforcement and those that have a general interest in the subject matter

Journal of Asian Security and International Affairs

The Islamic State: Combating the Caliphate Without Borders provides critical background information and analysis about the hybrid terror quasi-state's multifaceted activities and effects in the region and beyond.

Western Illinois University News

The Islamic State is a thorough and authoritative account of the rise of the terrorist army
that specialists and the general public alike will find very useful.

Peter Bergen, author of Manhunt, The Longest War and Holy War Inc.

The Islamic State provides an historical context for jihadi groups in the Middle East as well as an up-to-date analysis of the ever-changing geopolitical landscape. The Islamic State is written in an easy-to-read style, simplifying a wide range of complex topics. The Islamic State is a must read for curious readers and serves as an authoritative source for Middle Eastern scholars.

Jack Schafer, Ret. FBI Special Agent

This book is a work of profound insight and importance in guiding policymakers and the public as they search for an effective solution. The volume is highly recommended for experts, policymakers, students, and the general public alike.

Robert F. Turner, Center for National Security Law, University of Virginia Law School