This much-needed historical survey of the Sufi tradition brings together a great deal of specialized literature, especially the European scholarship that is often ignored in North America. The first eight chapters of the book discuss the beginnings of the tradition, early figures, gradual institutionalization, poetical and metaphysical expressions, and the foundations of the great tariqahs. Chapter 9 provides an overview of the later history of the tariqahs on a regional basis, in most cases coming into the 20th century. Chapter 10 discusses major concepts and practices. Given Knysh's keen awareness that the Sufi tradition cannot be isolated from the Islamic tradition as a whole, surprisingly little attention is paid to the roots of Sufism in the Qur[ham]an and the hadith. Then again, the survey is necessarily selective and aims only to highlight major figures and movements. Any serious attempt to be comprehensive would have given us a multi-volume study. Every specialist will be disappointed at the failure to discuss or at least mention certain figures, movements, themes, or topics.