Over the course of the past decade, journalists and other observers have noted a 'conservative turn' in Indonesian Islam, but without seriously investigating or explaining the nature and extent of the transformation(s) under way. With the publication of this excellent new volume, Martin van Bruinessen and his collaborators have now provided a fine-grained account of the complex and diverse manifestations of this 'conservative turn', with in-depth treatments of developments and trends across a range of different arenas and institutions - and regions - of Indonesian Islam. Van Bruinessen has always been a pioneering figure in the study of Islam in Indonesia, and with this volume he once again brings unparalleled insight and illumination to our understanding of Islamic life in the archipelago. This is a must-read book for anyone interested in Indonesian politics and society today. —John Sidel, Professor of International and Comparative Politics London School of Economics and Political Science