Caleb Jansen's old life is in ruins after being possessed by the vampire spirit Gray. Now all Caleb wants is for Gray to be exorcised so he can adjust to living as a registered paranormal. Instead, District Chief Kaniyar of SPECTR offers him a new choice: be locked away for public safety, or come work for the very agency he's spent years trying to avoid. The only good thing to come from Caleb's possession is his relationship with federal exorcist John Starkweather, but even that seems doomed to end before it can really begin.

John's newest case is a nightmare: someone is summoning demons and forcing them to possess women and boys snatched from the streets of Charleston. If his team can't find the summoner soon enough, the possessions will become permanent, transforming the victims into ghouls. To make matters worse, he barely prevents Gray from feeding on their only lead.

Can John shield his heart from Caleb, who only seems interested in a temporary hook-up? Can Caleb keep Gray under control while they hunt for the summoner? Or will the cost of solving the case be higher than any of them could have guessed?

Because the master of ghouls has set his sights on a new target: Gray.