Horrible Harry is at it again in a rollicking story of Field Day adventures, mishaps...and revenge!It's one of the best days at South Field Day! That means bean bag tosses, relay races, and tug of war. When Mr. Deltoid announces students will pair up to compete for a mystery prize, Harry and Doug are determined to win. But at what cost? Harry's sneaky tactics leave Sid and Mary grumbling. They even claim he's cheating. Harry insists he's playing fair and square. Doug doesn't know what to think! He must prove his best friend is innocent before his classmates seek Field Day revenge. Can they win and play by the rules, or will the highlight of the year be a horrible disaster?