Book excerpt: John Dee's angel conversations have been an enigmatic facet of Elizabethan England's most famous natural philosopher's life and work. Professor Harkness contextualizes Dee's angel conversations within the natural philosophical, religious and social contexts of his time philosophy, and the apocalypse, and argues that they represent a continuing development of John Dee's earlier concerns and interests. These conversations include discussions of the natural world, the practice of natural philosophy, and the apocalypse.