Over fifteen chapters, The ISIS Reader has featured milestone texts, video transcripts and speeches from the Islamic State movement, drawn from its tumultuous multi-decade history. In doing so, it has told the ‘inside story’ of the Islamic State’s struggle, from a wandering band of jihadis in Afghanistan to the Islamic State in Iraq, from near decimation in 2010 to its triumphant declaration of a caliphate in 2014, and, finally, from its global expansion across Asia, Africa, and the Middle East to its return to beleaguered insurgency in 2018–19. Presenting this trajectory in the Islamic State’s ‘own words’ offers essential insights into the complicated mixure of personalities, strategic logic, opportunism, success, and failure that shaped its fortunes. Several recurring trends emerge from this study that are pertinent for scholars wishing to understand the movement and strategic-policy architects seeking to devise strategies to confront it....