When an immovable frown meets an irresistible smile, as the song goes, something's got to give. And the little prince of this story is convinced that whatever gives it will not be his frown. How the court and his royal parents contrive to remove the immovable scowl makes a charming fantasy. Crockett Johnson, author of The Blue Ribbon Puppies and other books for children, writes of the make-believe in a low key, evolving a sensibly elastic world in which improbable happenings occur without shock.