1662. Alpine village hangman Jakob Kuisl receives a letter from his sister calling him to the imperial city of Regensburg, where a gruesome sight awaits him: her throat has been slit. Arrested and framed for the murder, Kuisl faces first-hand the torture he's administered himself for years. Jakob's daughter, Magdalena, and a young medicus named Simon hasten to his aid. With the help of an underground network of beggars, a beer-brewing monk, and an Italian playboy, they discover that behind the false accusation is a plan that will endanger the entire German Empire.