Drinker of Blood: SPECTR 2, Book 3 (Unabridged‪)‬

An outbreak of demon attacks across Charleston has worn SPECTR agent John Starkweather to the bone. Now a new threat faces his team: a demon with bullet-and bite-proof skin, which can't be stopped by ordinary means.

John's only solace comes in the form of his lovers: Caleb Jansen and the vampire spirit Gray. Caleb and Gray have their own problems, however. Unbeknownst to John, they've been tracking a mysterious entity across the city. And after they finally come face-to-face with their quarry, nothing will ever be the same.