Two-Face's plan to publicly execute Catwoman pulls Batman into a city that has become something worse than a prison. Mayor Sharp has handed authority to Hugo Strange and his TYGER operatives—who already know Bruce Wayne's secret—and a scheme called Protocol 10 threatens to give Strange absolute control of Gotham. Now an inmate himself, Batman must save Catwoman, expose Strange's endgame, and put a stop to Arkham City before the night is over.