London, summer of 1584: Radical philosopher, ex-monk, and spy Giordano Bruno suspects he is being followed by an old enemy. Instead, he is shocked to discover that his pursuer is in fact Sophia Underhill, a young woman with whom he was once in love. When Bruno learns that Sophia has been accused of murdering her husband, a prominent magistrate of Canterbury, he agrees to do anything he can to help clear her name. But in the city that was once England's...