Wael B. Hallaq is already established as one of the most eminent scholars in the field of Islamic law. In his latest book, he traces the history of Islamic legal theory from its beginnings until the modern period. The book is the first of its kind in organization, approach to the subject, and critical apparatus, and as such will be an essential tool for the understanding of Islamic legal theory in particular and Islamic law in general. Its accessibility of language and style guarantees it a readership among students and scholars, as well as anyone interested in Islam and its evolution.