Escaped convict Duke Le May joins the wagon train under an assumed name. When a deputy shows up to arrest him and is killed, Flint is asked to escort him to the nearest fort for trial but he does all he can to prolong that journey.

Flint must find a way to get the wagon train around a snow covered pass. On a scouting trek, he meets a father and son who are willing to help him but they want to hike up the mountain. The adventure ahead has surprises for them all.