A mighty Archbishop. A brilliant scientist. And a killer about to strike . . . A.D. 1311. Mondino is a university anatomist – a man of science in a land governed by the Catholic Inquisition. But the corpse brought to Mondino's laboratory one stormy night defies natural law: The victim is a Templar knight, and his heart has been transformed into a block of iron. Is it alchemy? Or the diabolical work of an ingenious killer? Aided by his headstrong student Gerardo – a young man concealing a deadly secret identity – Mondino must outwit both ruthless Inquisitors and vengeful Templars if he's to stop a murderer who threatens to shake the very foundations of Christendom. Audacious, gripping, and lushly atmospheric, set against the dramatic backdrop of one of history's most dangerous eras.