In the wake of its "Caliphate" declaration in 2014, the self-described Islamic State has been the focus of countless academic papers, government studies, media commentaries and documentaries. Despite all this attention, persistent myths continue to shape—and misdirect—public understanding and strategic policy decisions. A significant factor in this trend has been a strong disinclination to engage critically with Islamic State's speeches and writings—as if doing so reflects empathy with the movement's goals or, even more absurdly, may itself lead to radicalisation. Going beyond the descriptive and the sensationalist, this volume presents and analyses a series of milestone Islamic State primary source materials. Scholar-practitioners with field experience in confronting the movement explore and contextualise its approach to warfare, propaganda and governance, examining the factors behind its dramatic evolution from failed proto-state in 2010 to standard-bearer of global jihadism in 2014, to besieged insurgency in 2018. The ISIS Reader will help anyone—students and journalists, military personnel, civil servants and inquisitive observers—to better understand not only the evolution of Islamic State and the dynamics of asymmetric warfare, but the importance of primary sources in doing so.