These seals are carefully drawn from the planetary squares rendered both in Hebrew and numerically. Edited and annotated by Dr. Stephen Skinner and Daniel Clark, this impressive book reveals how the seals and characters fit exactly over the cells of the Planetary Table of Hebrew letters. W. H. Ibbett provides examples of specific spirits, such as Barzabel, and he shares more detailed astrological information within a magical context.

The Master Key presents drawings and interpretations of the fifteen Behensian fixed stars, including the talisman for the Head of Algol. Other talismans are also featured and explained, such as Characters of the Nine Chambers and a selection of talismans owned by famous men.

Although little is known about author W. H. Ibbett, the amount of usable magical information in his grimoire is truly astonishing. Written in 1854, this text is a complete course in magic, a master grimoire that stands head and shoulders above others.