While on a summer vacation, Emily discovers a whale living in her garden pond. So she writes to her teacher, Mr. Blueberry, for advice on how to care for her new pet. But Mr. Blueberry reponds that she must be mistaken, as whales live in the ocean, not in ponds. In a delightful exhange of letters, Emily learns about whales, and Mr. Blueberry learns about imagination, faith, and friendship.