On April Fool's Day the Joker leads a revolt of the inmates at Arkham Asylum, prison for the criminally insane. The Dark Knight Detective must save the day by saving the hostages and rounding up the bad guys. But what of Amadeus Arkham, founder of the infamous institution? Featuring the Dark Knight's arch-nemeses the Joker, Two-Face, Scarecrow, Poison Ivy, and more in the black heart of Gotham City's house for the criminally insane. This graphic novel is well-known for its psychological intensity and probing portraits of Batman and the Joker, as well as groundbreaking art that influenced scores of artists by introducing a new school of storytelling and technique to comics.