The Vacants - P. J. Talisker - Bog

John Roman is a Green Beret, a decorated Sniper, and upon returning home, a troubled veteran with PTSD. Suffering from "auditory hallucinations," John's only comfort is the woman he loves. Although he isn't in his right mind, John signs on for one last covert mission in Iran. He must reassess his beliefs as his illness, and a cataclysmic event make him wonder if he is insane, possessed by a nefarious demon, or destined to save the world. John must fight to get back home, as the world seems to be falling apart.