This work investigates the historical reality and procedural mechanics of the occult practices attributed to the Elizabethan polymath John Dee. Christopher Whitby, a scholar of Renaissance intellectual history, examines the primary source manuscripts detailing Dee's reported communications with spiritual entities. The book provides a rigorous analysis of the diaries and records, stripping away centuries of myth to present the raw, documented interactions between Dee, his scryer Edward Kelley, and the entities they claimed to encounter.

Experts recognize this text as a critical, scholarly resource for understanding the intersection of early modern science and mysticism. Readers frequently note the academic density of the prose, which prioritizes primary source documentation over speculative narrative.