When fifteen-year-old Jack Taylor is offered a job with the newly formed Pony Express Company, it looks as though he will be able to rescue his family from the financial problems which are troubling them. However, he injures his ankle, and it is likely his job will fall through. His twin sister, Beth, decides to ride in his place; this is the story of the only girl to ever ride for the Pony Express.
It's very racist, it's all about how the "Indians" are bad for defending their own land.
It ends with, her saying nothing else interesting ever happened to her and she got married. I don't think that's really a spoiler as it is heavily foreshadowed. A great disappointment but at least I picked it up for free