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! Steve Brezenoff is the author of more than fifty middle-grade chapter books, including the Field Trip Mysteries series, the Ravens Pass series of thrillers, and the Return to the Titanic series. He's also written three young-adult novels, Guy in Real Life; Brooklyn, Burning; and The Absolute Value of -1. In his spare time, he enjoys video games, cycling, and cooking. Steve lives in Minneapolis with his wife, Beth, and their son and daughter. .