This study is the first serious scholarly presentation of Adventism. The author discusses the world-wide Adventist denomination from its origin in Miller's spectacular apocalyptic revival in the 1840s. The main concern in the work is devoted to the talented visionary Ellen G. White. Her development and importance is analysed, also in psychological terms. The book is based on an impressive share of formerly not consulted primary material. The author is sympathetic towards the S.D.A. Church, but aims hard at an unprejudiced presentation.