The review summarizes the implications of David Reed's excellent study of Oneness Pentecostalism as a major treatment of the movement in which the sections regarding its background, history, and theology are equally comprehensive. Reed's work sets the movement, not in the context of its global expansion and impact, but within the context of its historical development amidst an array of Evangelical-Pentecostal tensions. It characterizes the movement as a sect, rather than a cult, and as a worldwide expression of Pentecostalism in its own right. This review, therefore, explores Reed's argumentation in which he explains its historical development as a movement rooted, first and foremost, in pietism, especially Wesleyan, which used Jewish categories, similar to the practice of early Jewish rather than Nicene Christianity. Reed contends that a tendency towards a Jesus-centric 'reductionism' in Evangelicalism shaped the movement and most of its patterns of doctrinal 'imbalances.' The specific setting for this influence is seen as the theology of William Durham, specifically, and the restoration impulses of Pentecostalism, generally.