A remote, heavily fortified island hides a device vital to Amanda Waller’s schemes, requiring Batman’s help to extract it—though a skilled burglar may be the only one capable of escaping with it intact. The device’s true nature surprises them, complicating their mission as unforeseen dangers emerge. Meanwhile, Gotham descends into chaos after Arkham Asylum’s lockdown fails, leaving the Bat-family stranded and criminals unleashed.