First published in 1929, The Mystery of the Great Pyramid attempts to unravel the secrets of the Great Pyramid by drawing parallels with the rituals in the Book of the Dead. The conception of the Pyramid and the origin of the cult of Osiris and of the Book of the Dead are to be found in a common source, which maybe expressed in the one word, Messianism. The author argues that this is why the literature of early Christian gnosticism abounds in mystical pyramid figures and associated astronomical conceptions and constellations. This book will be of interest to students of history, philosophy, and theology.