Brothers Ed and Jimmy are traveling with their family to a new homestead in Texas. Along the way, they come across a big surprise--a stagecoach carved out of rocks! Dad explains to the boys that the carving is a monument to the Butterfield Trail, a former mail route which ran from the Midwest to California. After settling into their new homestead and helping Mom and Dad with chores, they return to the stagecoach to play, and end up on an adventure they never would have imagined!