Batman Vol. 1 (1940-2011) #570

Plot

Continued from Batman: Shadow of the Bat #90

Harley returns just as the Joker expands his turf over the broken bodies of two warring gangs. While she uses a philosophy called "The Code" to try to manipulate events to her liking, Joker makes a sweeping move that threatens to tip the balance of power in Gotham and change the face of "No Man's Land" forever.

Continues in Detective Comics #737