Set in Harley's earliest days with the Joker, the DC Universe's most mischievious anti-hero makes the biggest mistake of her burgeoning criminal career...accidentally revealing the location of Mistah J's hideout! She tries to make it up to her puddin' after her colossal blunder—but the Joker's wrath is not easily soothed! And how will the Dark Knight make matters even more complicated? Paul Dini returns to his roots with an all-new take on the romance of the century in ! Collects the backup stories from issues #17-25 of the series and #1-2.