In a world on the brink of chaos, a clandestine government agency and a covert church council enlist the aid of Serin, a mysterious she-hybrid, to hunt down an enigmatic entity poised to unleash the apocalypse. As she navigates a treacherous web of allegiances and betrayals, Serin must confront her past and unravel the truth behind the celestial or infernal threat, racing against time to seal it away before all is lost.