Mr. Wahl, who has not been writing juvenile books long, is remarkable for the high quality of such diverse books as Hello Elephant and Pleasant Fieldmouse. He has also been most fortunate in his illustrators -- Ardizzone, Sendak and now Adrienne Adams. This is a light fairy tale illustrated in rich color and set against the velvet black of the night when a bicycling villain made off with the cabbage-like moon which overlooked Princes Adelgitha's garden. He was on the verge of turning it into cabbage salad when Jennie, the Princess' small dog, raced to the rescue. Jennie is drawn as a lovable mutt who sets off her owner's suitable fragile royalty and the moon, as a good moon should, has an expressive face for each of the pages. Simple, satisfying and very good looking.