So a group of hired mercenaries tried to rob a bank, but Batgirl stopped them. Apparently they have something to do with Knightfall? Sure. Speaking of Knightfall, she's planning something to clean up Gotham and hears the story about Ricky suing James Gordon. Knightfall can't stand by while a common criminal attempts to kick a good police officer while he's down (despite her history with him) so she sends her associate Bonebreaker to pay him a visit.
So Babs does some searching for Knightfall, finds nothing, and ends up walking in on her roommate and that girl she was with last issue, meanwhile, Ricky is getting politely threatened by the woman who cut off one of his legs. Fun times.
The next morning, Babs goes out for a jog until she's stopped by a woman she seems to recognize, and greets with a punch to the face. Turns out Babs had a friend in college who goes by the name of Obscura now. They both trained together until Obscura was recruit for some secret counter-terrorism group and had to fake her death, but now she needs Barbara... That's a lot to go through in the two page, but again, sure, whatever.
Obscura brings Babs to a secret location and is all "Someone named Knightfall is planning something big like a coup and we need someone like you to spy... on regular people, or something, just tell us if you hear anything." Something like that. Meanwhile Babs is all "No!" Obscura is all "I can destroy you!" but Babs is still all "No!"
So Babs gets dropped off and gets a call from Ricky, turns out Knightfall had his brother's hand cut off and sent to him, so he's dropping the case against Babs' father. This makes Babs mad, so she goes to take down Knightfall once and for all.
To help her fight Knightfall, Babs recruits the help of Black Canary, and just about when they're going to go in for the fight, Helena Wayne shows up and is all "Can I help?" Because, fuck man, I don't know? It's like the old Birds of Prey... but it's not. This is something we'll get to shortly.