In the last decades, the religious and ritual side of Neoplatonism has attracted growing scholarly interest. Crystal Addey’s study is part of this discourse. It explores divination as a central facet of the rituals that were subsumed in Neoplatonic circles under the label “theurgy”. The focus lies on two major figures whose debate shaped the Neoplatonic discourse about rituals: Porphyry and Iamblichus. The book aims to demonstrate the basic harmony between the two philosophers as far as divination and rituals are concerned. In so doing, it inserts itself into a strand of research that emphasises the fundamental unity of the Porphyrian oeuvre, also as far as rituals are concerned (e.g. Smith 2007 and 2011, Busine 2004 or 2005, Johnson 2013).