The Prince of Tarn — Hazel Hutchins

Fred can't believe the Prince is actually standing in his bedroom. Are his mom's stories becoming real? He tries to send the Prince back home to his magical kingdom of Tarn, but in the meantime the Prince barks orders at everyone, including Fred's teacher. It is only when Tarn is being destroyed that they find a way to get there--and in the process each boy finds that the other isn't so bad after all.