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.