From the Back Cover
The first book is Abraham's autobiography in which he speaks to his son. The second book is an explanation of the purification rituals necessary to bring the magician's personal demon under his control. And the third book details what feats can be accomplished once the practitioner is able to use a form of magic controlled and directed through sigils of magic words written on a grid.
Anyone with an interest in the occult will find this an interesting, though perhaps impractical, guide for exploring mystic arts.
British magician and eccentric SAMUEL LIDDELL MACGREGOR MATHERS (1854-1918) also wrote The Key of Solomon the King (Clavicula Salomonis) and The Kabbalah Unveiled.