1560: Rumour shrouds the death of the woman who stands between Lord Robert Dudley and marriage to the young Queen Elizabeth. Did Dudley's wife, Amy, die from an accidental fall, or was it murder? Even Dr John Dee, astrologer royal, and one of Dudley's oldest friends, is uncertain. Then a promise to the Queen sends him to the Welsh Border in pursuit of the Wigmore Shewstone, a crystal credited with supernatural properties. But devious politics, small-town corruption, twisted religion and a brooding superstition leave John Dee isolated in the land of his father.