Knightfall AU. Bane has broken the Batman's back leaving Bruce Wayne unable to continue as the Dark Knight, but in his and Gotham's hour of need, a new crimefighter appears to carry on and Darkness gives way... to Tomorrow.
The descendants of Edward Nigma and Jonathan Crane have, somehow, managed to team up, and plan to eradicate all of the crime. All of it. But...how? Well, friend, that there is the most terrifying conundrum of all. [I don't know how else to sum this up, because there's no set plot or anything. We'll just have to see where it goes...]
Batman has a lead on Joker and goes on a wild adventure.
A summarized depiction of the Joker's story.