By embedding himself behind enemy lines, Hall provides a riveting narrative based on firsthand experience and personal interviews. He goes beyond the vicious jihadis, to reveal a generation of chaos, and uncover a volatile region engulfed in turmoil. Hall reveals why ISIS is a problem that will define the Middle East - and the West - for decades to come.

ISIS homecoming -- The Caliph -- Syria's collapse -- Iraq implodes -- Twisted ideology -- Military prowess: the greatest weapon is fear -- Kidnapped and murdered -- Sex -- Steven Sotloff -- A cold war: Saudi Arabia vs Iran -- Alan Henning and David Haines -- Qatar, Libya, Kuwait -- Executions -- Centralized funding -- Khorason -- Children of the Caliphate -- Abdul Rahman Peter Kassig -- Christians slaughtered -- Inner working of ISIS -- Sharia life -- Foreign fighters -- Turkish border -- Syria's Kurds and Kobane -- Iraqi Kurds -- Kurdish arms bazaar -- Social media -- Other support for ISIS -- What lies ahead -- Conclusion.