In Blood We Trust Bloodlands Series, Book 3.

They are monsters: Mariah, the reluctant rebel who has become a god to others of her kind, and Gabriel, the vampire, who loves her at his own peril. They have returned to the Bloodlands, where their story began-to face the horrors of Mariah's past and the uncertainties of Gabriel's future- and to make a final stand, for their lives-and their love.