When Gotham City's biggest baddies gather to plan a heist, they tell Harley to go wait with the goons! What?! But the joke is on them after Batman busts in and she sneaks out holding blueprints that show the way to the crooked payday. Can the jilted jester pull off a solo steal while dodging the criminal bosses on her tail? Find out in this action-packed chapter book for DC Super Hero and Super-Villain fans!