"The Many Faced Jewel" deals with the primal, transcendental, reality of the witches' Sabbat. It outlines how the individual can hook into this reality, as well as how this basic reality has been recognized by a variety of mystical religious traditions throughout the ages. These include Christian, Gnostic, Islamic, and Pagan mysticism. It examines the fundamental unity between these esoteric traditions based on their partaking of the "Primal Vision" of the Sabbat.

Next, it looks at 19th century influences on 20th century traditional witchcraft. This includes themes such as the megalithic tradition in Europe, Gerald Massey's work, the concept of the Cabiri, and Neo-Druidism. It documents an example of the influence of Freemasonry on the Craft.

Finally, it presents practical instructions and theory. These include treatments of the thought of Austin Osman Spare and Andrew Chumbley. It includes a grimoire with cosmology, descriptions of gods, advice on ritual, as well as a ritual framework. It also contains a treatment of the Toadstone in relation to the Sabbat and witchcraft, and outlines a system of esoteric anatomy and practice.

"The Many Faced Jewel" complements "The Magitians Discovered", volumes 1 and 3, and clarifies and deepens themes in these works, relating them to traditional witchcraft.