When a long-lost diary surfaces, it seems Tom and Paul have found the key to the labyrinth - but when a fellow researcher is murdered, they suddenly find themselves in great danger. And what they discover embedded in the text stuns them: a narrative detailing the passion of a Renaissance prince, a hidden crypt, and a secret worth dying to protect.
Tom Sullivan, about to graduate from Princeton, is haunted by the violent death of his father, an academic who devoted his life to one of the rarest, most complex books in the world.