This edition presents the fourth, final part of the Book of Four, written by the great magician, head of the Order of the Eastern Templars, Aleister Crowley. The basis of its content is the "Book of the Law" ("Liber AL vel Legis sub figura SSHH"), with which the whole life and teachings of Crowley were connected. He was not the author of this prophetic book, but only recorded it from the voice of a certain higher entity named Aivass, who dictated this text to him on April 8-10, 1904 in Cairo. Crowley was convinced that the Book of Law is the source of the spiritual principles of the New Aeon and the key to moving to a new stage in the evolution of all mankind.