The Little Moon Theater, by Irene Haas. New York: A Margaret K. McElderry Book/Atheneum. $9.95.

This book is a world of wishes come true - both for its characters and its readers. The story, with all the beauty and whimsy of an old-fashioned fairy tale, concerns a little girl who travels around the countryside with her dog and cat. Calling themselves the Little Moon Theater, the trio acts out theater pieces from the back of their little caravan to win love and respect for people who have been ostracized from the community, usually because they're different.

The actors show that one little girl who wears one red sock and one yellow sock has her own unique style, and friends begin to appreciate her once again.

The book's illustrations in clear, rich colors, are perfect complements to the imaginative verse messages of acceptance and goodwill.