When Harley springs Poison Ivy from Arkham Asylum, the jaunty jester expects a little payback. After all, there's no limit to the criminal empire she could grow with the Queen of Green's help. But will Harley bloom into the big boss she's always wanted to become, or will her villainous dreams wilt on the vine? Find out in this action-packed chapter book for DC Super Hero and Super-Villain fans!