Jack, and his friends C.J. and Lizabeth, are starting fifth grade. Two boys in their class, Steve and Cliff, are bullies. They pick on Jack all the time, taking his lunch money, letting air out of his bicycle tires, and stealing his baseball glove. Jack doesn't want to be a tattle tale so he doesn't share what's happening with his parents or teachers. When a German boy, Hans, is added to the class, Jack and his friend help him adjust to the school, but the bullies target him, too. Jack finally works out a plan to get his glove back, end the bullying, and enjoy his birthday party at a World Series baseball game.