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Scientist, mathematician, and court astrologer to Queen Elizabeth I, John Dee is also one of the sixteenth-century's most renowned alchemists, driven by a passion to fathom the elemental secrets of the cosmos. But when his reckless assistant, Edward Kelley, succeeds in using a crystal sphere to summon angels, Dee is catapulted into an awesome struggle that may extinguish the light of reason forever. One of the spirits invoked is a cunning demon who takes possession of Dee's young daughter, Katherine, and shows Dee a frightening vision of his own future. Terrified by what has been foretold, Dee abruptly decides to close his house in London and flee to Europe with his long-suffering wife, Jane, and their two young children.Their desperate flight brings them at last to the city of Prague—a center of culture, knowledge, and learning, both sacred and profane, a gateway between the Eastern and Western worlds, and also, it is...