Batman's run-in with the horrific Asema has left him questioning everything. Who is Asema, how does she know Bruce Wayne, and for what foul purpose is she draining the blood of young men across the city? To find the answers to these burning questions, the World's Greatest Detective must plunge into the darkest corners of his city and his psyche. The very foundation of the Dark Knight is beginning to crack -- can he solve this mystery before it crumbles completely?