"February, 1586. When the queen's spymaster, Sir Francis Walsingham, learns that Ursula is to visit her relatives in Devon, he asks her to find out what has happened to two of his local agents, who have been strangely silent recently. On arrival in the small Devon village of Zeal Aquatico, Ursula discovers that both spies in question have met with mysterious - and fatal - accidents. Or is there more to it than that?"