In the midst of the steampunk era, the City of Prague is at the heart of the Holy Inquisition, which is determined to wipe out the witches and heretics endangering the world. A young scientist is accused of witchcraft and ends up coming to the attention of Ignatius, the High Inquisitor. An unexpected attraction complicates an already dangerous situation—a situation that many are happy to exploit, from other authorities within the church to city leaders. Ignatius will have to choose between the life he's always led or the warlock he shouldn't love—if they survive long enough to have any choice at all.

It is the era of steam and science, but in their midst superstition and real witchcraft also thrive. Ignatius is a fallen inquisitor on the run—but at least he's on the run with the man he loves. When they find themselves in the middle of the Carpathian Mountains, they take shelter in a village. But the village proves to be plagued by vampires, a complication they don't need on top of their fragile relationship and the struggle to simply survive.