In 1907, in the midst of a mystical frenzy, Aleister Crowley received a series of arcane sigils. These sigils were said to be the completed form of the Major Arcana of the Tarot, as witnessed by Osiris in the Egyptian underworld. Each Major Arcana is represented by two sigils: upright form of the card, called the House of Tahuti, illustrates its triumph or virtue; whereas the averse form, called the Prison of the Qliphoth, shows its downfall or vice. Each sigil represents a spirit, each spirit is given a name, that the spirit might be called. Crowley published these sigils and names without commentary in 1912 in The Equinox vol 1, no 7. This present work is a comprehensive exploration of Aleister Crowley's holy book, Liber Arcanorum. Robert C. Stein presents an initiate's perspective into the system as a whole. He further explores in depth the significance of each individual sigil and its corresponding name. Complementing this analysis, Barry William Hale offers a series of mesmerizing drawings, each piece ingeniously merging the upright and averse spirit of each tarot card into a single, unified form. Together, the engrossing artwork and penetrating analysis uniquely honors and unveils the mysteries of the holy book. This book serves as a vital key to unlocking the mysteries of the Major Arcana and the spirits contained therein.