When Billy applies to the Pony Express, he doesn't expect superintendent, Mr. Slade, to hire him as a farmhand for some remote relay station called Mud Springs. Amos, the station manager, is none too pleased either. Instead of a strong, full-grown farmhand, he's sent a twelve-year old boy.
As soon as he arrives at the Mud Springs station, Billy realizes he's in for a challenge. Situated miles from anywhere, surrounded by vast stretches of bleak,...