Batman: White Knight #1

In a world where Batman has gone too far, The Joker must save Gotham City.
He's been called a maniac, a killer and the "Clown Prince of Crime" but "white knight"? Never. Until now...
Set in a world where the Joker is cured of his insanity and homicidal tendencies, The Joker, now known as "Jack," sets about trying to right his wrongs. First ...