No one-certainly not Melani, who longed for the country-could have imagined that a city house could be like this, but there it was, big and old, lovely and strange, with odd juttings and turnings and unexpected windows. And it stood just where the city met the Pacific Ocean, next to a vast park. Mel's room looked onto the park with its flowers and trees, and horses on the bridle paths. It was there, early one foggy morning, that she first saw the ghost horse-a great silvery stallion standing on a hill rising like an island above the swirling fog. ''The author's love of horses and of art overflows into this romantic, delightfully told story about a gifted family," said the Chicago Tribune when this book-enjoyed and remembered by its many enthusiastic readers-was first published. "Where has the stallion come from? is he real'. . . How these questions are answered and how Mel wins her heart's desire brings to an end what her family agrees has been a 'very fine summer.'"