Batgirl And The Birds Of Prey #19

"'Full Circle' part one! In addition to her vigilante life as Batgirl, Barbara Gordon also fought crime behind the scenes as Oracle. Now she's taking it one step further-working to stop crimes before they happen. Her first target? Bringing down the Calculator's intricate network of super-villains. Huntress and Black Canary are concerned she might be going too far, and it could put them all in the crosshairs when a new evildoer arrives to settle the score on behalf of the Calculator."