1662: Jakob Kuisl, the hangman of Schongau, 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. When the city constable discovers Kuisl alongside the corpse, he locks him in a dungeon, where Kuisl will experience firsthand the torture he has administered himself for years.
Kuisl’s steely daughter, Magdalena, and her young doctor paramour, Simon, rush to Regensburg and try to save Jacob. 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.