In 1785, Professor Sebastian Grave, a seasoned monster-slayer, learns of the return of the Beast of Gevaudan, which once terrorized France.

Twenty years prior, aided by his demon Sarmodel, Sebastian attempted to kill the Beast, nearly losing his life. Recalled by Antoine Avenel d'Ocerne, an estranged lover intertwined in a dark history, Sebastian seeks to settle scores with the Beast and reconnect with Antoine.

Amidst a France on the verge of revolution, Sebastian faces both inquisitorial scrutiny and the looming threat of the Beast, which endangers Europe in this epic historical fantasy by debut Australian author Cameron Sullivan.