Book excerpt: This book deals with Muslim modernity in a country with the largest single Muslim population in Sub-Saharan Africa. It provides much needed new grounds for comparative study. Until now, virtually all socio-anthropological works about any specific African country are either authored by nationals of that country or by Western scholars. This book is an exception because its author is an Islamicist and a social scientist from Senegal trained in the French social science tradition. Therefore, his work does offer an original perspective in the study of Nigeria. In addition, the study of Islam south of the Sahara has so far focused on Sufi orders, which form the mainstream of Islam, but which by no means, covers the whole Islamic field; socalled Islamic fundamentalist movements are also part of the religious landscape. This book is devoted to the study of the largest single Muslim fundamentalist organization in postcolonial Sub-Saharan Africa, the Society for the Removal of Innovation and Reinstatement of Tradition.