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!