In the mid-1800s, when most girls are not allowed to have jobs, Charlotte Parkhurst disguises herself as a boy in order to work with horses. She goes by the name of "Charley" and keeps her true identity a secret. Years later, "Charley" moves from Rhode Island to an area near Sacramento, California. There, she and her friends, James and Frank, drive horse-drawn stagecoaches for a living. Suddenly, a bad accident leaves Charlotte partially blind. Now with only one good eye left, Charlotte must relearn how to drive a coach.