All this was preparation for Dee's main achievement: five books, revealed and transcribed between March 1582 and May 1583, bringing to light mysteries and truths that scholars and adepts have been struggling to understand and use ever since. These books detail his system for communicating with the angels, and reveal that the angels were interested in and involved with the exploration and colonization of the New World, and in heralding in a new age or new world order. While Dee's influence was certainly felt in his lifetime, his popularity has grown tremendously since. His system was used and adapted by the Hermetic Order of the Golden Dawn, and subsequently by Aleister Crowley.

This new edition of John Dee's Five Books of Mystery is by far the most accessible and complete published to date. Peterson has translated Latin terms and added copious footnotes, putting the instructions and references into context for the modern reader.