Book 4 an Abridged Magick Liber ABA Author:Aleister Crowley, Mary d'Este Sturges Book 4 is widely considered to be the magnum opus of 20th century occultist Aleister Crowley. It is a detailed treatise on Magick, his system of Western occult practice, synthesized from many sources, including Eastern Yoga, Hermeticism, medieval grimoires, contemporary magical theories from writers like Eliphas Levi and Helena Blavatsky, and hi... more »s own original contributions. This illustrated and abridged edition consists of three parts: Mysticism, Magick (Elementary Theory), Magick in Theory and Practice, and THE EQUINOX OF THE GODS (the short biography of Aleister Crowley)« less