The "lively" (The New York Times) Agents of the Crown series continues with this thriller about Queen Elizabeth I's advisor John Dee in a race to save the Empire with the help of a mysterious manuscript that offers global power.With rumors of the end times swirling, philosopher and astronomer John Dee travels to Prague in an effort to prevent one of Catherine de Medici's seductive ladies-in-waiting from luring the Holy Roman Emperor into a crusade against England. To convince the famously occult-loving Emperor to join his side, Dee entices him with the esoteric Book of Secrets, a volume that, if decoded, could provide the chance to control the levers of heaven and earth. But Dee faces enemies at every turn, including a female codebreaker who could be the undoing of Dee and the British Empire.

In this first novel of the exhilarating Spymasters series, a man who will become the original MI6 agent protects England and Her Majesty Queen Elizabeth I from Spain's nefarious plan to crush the Age of the Enlightenment.After centuries locked in an endless cycle of poverty, persecution, and barbarity, Europe has finally emerged into the Age of Enlightenment. Scientists, philosophers, scholars, and poets alike believe this to be a new era of reason and hope for all. But the forces of darkness haven't completely dissipated, as Spain hunts and butchers any who dare to defy its ironclad Catholic orthodoxy. Only one nation can fight the black shadow that threatens this new age, and that is Britain, now ruled by a brilliant young Queen Elizabeth I. But although she may be brave and headstrong, Elizabeth knows she cannot win this war simply by force of arms. After her armies have been slashed in half, her treasury is on its knees. Elizabeth needs a new kind of weapon...