When Harley's hyenas are taken hostage, it's no laughing matter! The culprit is the Clown Prince of Crime, and landing a punch line on her part-time partner won't be easy. Can Harley find a way to crash the Joker's hideout, free her beloved pets, and prove, once and for all, that the joke is really on him? Find out in this action-packed chapter book for DC Super Hero and Super-Villain fans!