"A hard-hitting psychological horror story featuring Batman and virtually all the inmates of Arkham Asylum, the house for the criminally insane. Led by the Joker, the inmates, Two-Face, the Mad Hatter, Killer Croc, Clayface, Scarecrow, and more, take over the asylum and seize control of the staff. They're willing to release the hostages, but only if their one demand is met: Batman must be turned over to them, and become one of their own."--Page 4 of cover.