The Joker is done toying with Gotham City and its Dark Knight. Now, he means to end the game and destroy them for good. Why? Because he knows the joke is older than anyone thinks. Older than Batman. Older than Gotham. For the Joker, evil is eternal. And when he unleashes his masterstroke, no one - not Batman, not Batgirl, not even the students of Gotham Academy - will be able to make the laughter stop...