Vowed In Shadows Marked Souls Series, Book 3.

The war between Good and Evil has raged for millennia, with the Marked Souls caught in the middle. Now two lost souls will tip the precarious balance. Possession by a demon cost Jonah Walker his faith, his humanity, and his wife. Once a righteous missionary, he endures immortality with nothing but a body for battle and a bent for retribution. But his last devastating fight left him wounded beyond healing, and his only chance to redeem his soul li...