Book excerpt: The Queen's conjurer, Doctor John Dee; Elizabethan mathematician, cryptographer, and mystic, is commissioned by her Majesty's spymaster, Walsingham, to suss out the loyalty of a Catholic Duke who governs an island in the English Channel. His mission: Discover any treason, religious terrorists and possible threats to The Crown. In preparation for his mission, Dee becomes acquainted with William, an unknown, teenaged playwright, who has just written a horrendousflop - "Prince Amleth". On a blustery winter's day, they set sail on their clandestine mission to find forbidden, seditious clues in the strangest of places. Dee must rely on his ingenuity, build trust with his young companion, and follow each slim lead to discover if recusants exist on the island or if there are yet some loyal to the Crown.His very life depends on it.