The Book of Thoth (1944) by Aleister Crowley is the definitive guide to the Thoth Tarot deck,, illustrated by Lady Frieda Harris. It presents the tarot as a masterwork of occult philosophy, integrating Qabalah, astrology, Egyptian mythology, and Thelemic cosmology, serving as a guide to the 78 tarot cards as keys to higher consciousness. Considered a crucial text for advanced tarot students, it operates as a, {"grimoire"} rather than a beginner's guide to card reading, focusing on the magical and philosophical significance of the deck.