The Secret of the Dark Stranger

The Fly-By-Night Ranch was famous all over Texas. Not just for its great horses, but for the strange legend that surrounded the ranch -- the legend of the Fly-by-Night Ghost, and the missing precious ruby. Sue and Sally didn't believe in ghosts - or legends - until they saw the dark stranger with their own eyes, and discovered a hidden passage that started them on a wonderful and mysterious hunt for long-lost treasure.