M. Hakan Yavuz was one of the early contributors to the literature on the Gülen movement, co-editing a major volume on the subject with John Esposito in 2003 (Hakan Yavuz and John Esposito, Turkish Islam and the Secular State: The Gülen Movement [Syracuse University Press: 2003]). In the intervening decade the movement has grown considerably in size and influence both within Turkey and beyond, and has emerged as a major source of interest and apparently perennial controversy. Towards an Islamic Enlightenment is therefore a timely if ambitious book, for it sets out to provide a comprehensive account of the movement.