Grayfox (The Journals of Corrie and Christopher‪)‬

When Zach Hollister hears stories of the first Pony Express riders, he jumps at the chance to finally strike out on his own and leave Miracle Springs behind. But he soon learns that the Pony Express Trail holds more than the promise of adventure, independence, and great pay. It's a challenging and dangerous road that will lead him to discover who he truly is.