Having separated from the one-armed trapper who taught him how to survive in the wilderness of the Old West, fifteen-year-old Francis gets lost and continues to have adventures involving dangerous men and a friendly mule.

"Young wild colt Sky must find his way over rough terrain to rejoin his family after being captured for the Pony Express"--Title verso page.

Fifteen-year-old Francis and the two children he has adopted travel across the Old West, evade Comancheros, discover a treasure, and wind up rich beyond their wildest dreams.