After the events in Batman: Arkham Asylum, Mayor Quincy Sharp decides to crack down on Gotham’s criminal element, which results in an assassination attempt on his life. More determined than ever, he enacts martial law. Sharp’s private army walls off half of Gotham and transforms it into an open-air prison dubbed Arkham City.

It doesn’t take the world’s greatest detective to know there’s a more sinister purpose behind it. Find out what it is in this 5-issue prequel to the video game.