Sir Francis Walsingham, Queen Elizabeth's Secretary of State, was the greatest spymaster the world had ever seen. But when he asked Dr. Dee to summon a demon the result was unexpected, especially for his orphaned niece Lucy. Sir Francis's duty as her guardian was to find Lucy a suitably aristocratic husband, not to let her fight demons and witchcraft for the Queen's Secret Service. But his-and Lucy's-duty to protect Queen and country from enemies both natural and supernatural kept getting in the way. And so did all those demons . . .