Despite being on the cover, the Joker is not in this issue.
With a simple over-tag by the Blue Boys (GCPD), a war broke out between the LoBoys and the Street Demonz. After days of bloody combat, the Blue Boys simply walked in and claimed both territories (which included Police HQ and the Clocktower where Barbara lived). Batman and Alfred returned to Gotham City. After contacting Oracle, Batman ran into the new Batgirl. He told her he did not approve, but also did not disapprove; he ordered her to not disgrace the symbol.