When George and Harold use their traveling purple potty to travel to another dimension where the school is nice and the principal, Mr. Krupp, thinks they're funny, they meet up with their evil twins and must face their cleverest enemies ever -- themselves.

Pick up the latest tale in the classic Harold and the Purple Crayonseries and follow Harold as he hunts for treasure! This new story based on Crockett Johnson’s beloved character encourages readers to pick up their crayons and use their imagination to go wherever they’d like. A moonlit walk on the beach makes Harold yearn for adventure on the high seas! With his trusty purple crayon in hand, the curious Harold finds a ship and sails off to meet...