A boy and his father are banished because the father, a magician, has a mischievous habit of making things vanish. But when the monster Abiyoyo appears, devouring such large items as cows, the boy plays a song (Abiyoyo) on his ukelele to make the monster dance; then the father makes Abiyoyo disappear and all is forgiven. Monster stories are always popular. The charm of this one (based on a South African lullaby and folk tale) lies in Seeger's wry understatement coupled with Hays' outstanding illustrations. His bold, highly organized designs glow with sunny blues and greens; the monster, satisfyingly grotesque, is all gray facets, machine-man gone mad. And the villagers are an international, interracial group, suggesting that the story is also a parable. The song, with music, is included. A splendid introduction for Hays; his next books will be eagerly awaited.