It is an achievement when an author succeeds in telling a rattling good tale, and at the same time weaves into it all sorts of details of the people concerned, the setting, the customs and the feel of the land. Charlotte Jackson has done just that in this amusing story of the mischievous pet pig, who got the whole family into serious trouble, when they went to the fiesta -- and who got them out of trouble by some more of his mischief. Through the pattern of the story itself, she has woven a vivid picture of life in the hills, of the native Indians, their activities, their ways of living, the things they do, the food they eat, the clothes they wear. And one can share with them the thrill of the fiesta and the market place. A grand job. The Kurt Wiese pictures have caught the humor and quality of the story.