Horse Called Mystery — Marjorie Reynolds

Owlie wanted a bicycle but he bought a lame horse he didn't even know how to ride. It didn't make any sense at all. But Owlie just knew that he wanted Mystery. In a summer of surprises, Owlie learns a lot about horses and people--including the strange visitor on the island. And in the end, Owlie and Mystery teach the whole town an important lesson.

Marjorie Reynolds has written a lively story for pre-teen-age readers about the growing up one boy does in a summer.