This key to the world's esoteric traditions uncovers some of mythology, religion, and philosophy's most fascinating and well guarded truths. It distils ancient and current teachings of approximately 600 scholars and is unrivalled in its beauty and comprehensiveness. The Sphinx's riddle and Pythagorean astronomy doctrines are among the compelling topics, as are the pentagram's symbolism, the meaning of the Ark of the Covenant, and the design of the American flag.

Manly P. Hall delves into the mysteries of Isis, as well as the occult aspects of mystic Christianity and other religions. Fascinating examinations include a wide range of subjects, including Kabbalah, alchemy, cryptology, and Tarot, as well as Masonry, gemology, and William Shakespeare's identity.