Tristan, a freelance magician, falls for an incubus, a Gomorrah pleasure demon, who works as an escort in a luxurious hotel in Prague. To free him from a contract that binds him, Tristan needs to solve a problem for a very influential man, Ambrosius Schwarzenstein, who is currently looking for a personal assistant with a knowledge of occult practices.

As Tristan plunges into an investigation of a mysterious death, he might find more than he wants to and face his worst fears. Will he set his lover free or bring trouble to them both?