Batman #684 B (Nightwing Ltd Tony Daniel Variant Cover)

In a world without a Batman, what happens when Commissioner Gordon lights the Bat-signal, in desperate need of assistance against the growing tide of crime sweeping his city? What does Nightwing do when his longtime partner fails to aid him in yet another of Two-Face's villainous assaults against Gotham? Without The Dark Knight to protect its walls, Gotham City may be facing its final days!