The Cain Letters Book 1 of the Divine Covenant by Pierre Roustan

My agony comes from the hate I have for them: the revenants of the night. They are my flame, and I am the moth. But this manuscript -- the "Cain Letters" -- uncovers the truth of vampirism deeply ingrained within the words of Scripture, the book of Genesis, and I'm forced to make a choice I don't want to make. As rogues hunt for that infernal manuscript, I realize that I, Alexandra Glade, vampire hunter for the Berith Lochem, the "Divine Covenant," must not hunt the vampires of my dark heart tonight.... But the truth for the sake of my soul! For I am a death dealer. And I need healing. Please, Lord, heal me -- heal me from all the hate before I become worse than that which I've been called to kill.