Being a teenage vampire in a human family isn't easy, especially in a city where harboring any monster subspecies is illegal. When Everett is injured attempting to save a werewolf, she takes him to the Monster Asylum, a place that shouldn't exist, and introduces him to a world of acceptance and possibility. Dark creatures begin to plague the five cities. Everett's ability to fight against them makes himirreplaceable if the human world that fears him can accept a vampire as a hero.

A plague spreads through Edge City. Certain the Four Horsemen are behind it, Aleric tracks the plague to a restaurant in the middle of the city. With the possibility of an apocalypse hanging by a thread, Aleric has to confront each of the Horsemen to end the threat to the city he loves. Still dealing with pain from the Archdemon's wound, Aleric is pitted against gorgons, a vampiress, and limited time to find what Death is looking for and return the Four Horsemen to the fae world.