Abdel Bari Atwan is one of the leading analysts in the world on the modern Middle East. In his new book on ISIS he delivers a uniquely informed, crisply argued, and excellent account of the world's most powerful terrorist organization."—Peter Bergen, author of Manhunt: The Ten-Year Search for bin Laden from 9/11 to Abbottabad "This is a brave and important book. It lifts the lid on how Islamic State combines an ideology of 1, 000 years ago with the use of twenty-first-century information technology to spread its messages. If you want to understand what motivates those prepared to behead hostages and post the results on the internet, then this book is a must-read."—Gavin Esler, award-winning BBC presenter and author "Atwan ‘got it’ from the moment bin Laden appeared on the scene."—Michael Scheuer, former head of the CIA bin Laden "Alec" unit