Five hundred years ago, Johannes Gutenberg discovered the art of libriomancy, allowing him to reach into books to create things from their pages. Gutenberg's power brought him many enemies, and some of those enemies have waited centuries for revenge. Revenge which begins with the brutal slaughter of a wendigo in the northern Michigan town of Tamarack, a long-established werewolf territory. Libriomancer Isaac Vainio is part of Die Zwelf Porten?re, better known as the Porters, the organization founded by Gutenberg to protect the world from magical threats. Isaac is called in to investigate the killing, along with Porter psychiatrist Nidhi Shah and his dryad bodyguard and lover, Lena Greenwood. As they begin to investigate the crime, their involvement could unleash a long-dormant evil.