Donald Duck's triplet nephews Huey, Dewey and Louie (who do not wear their traditional colors) play a prank on their uncle and hide in the attic in hope that he might calm down. They, however, are caught inside a magical book, which is controlled inside by King Pete. After knowing this, Mickey and Donald enter the book in order to find the duckling brothers and stop the evil Pete once more. According to the ending, Pete renounces his evil ways upon being defeated and becomes good. The costumes for Mickey and Donald, this time, are different from each other.