Jack, falsely accused of a crime committed by Black Roger, a bandit leader, joins his pals--Ace and King. They throw in their lot with the Mortonites, a small religious sect whose wagon train is set upon by Black Roger's men. Among the travelers is Nancy Owen, coveted by Black Roger, but with whom Jack is smitten; the bandit incites the Indians against the train, and old Morton is slain. Jack promises to lead the train and captures David, Nancy's brother, who is sent to kidnap her by Roger. When the Indians attack again, Jack sends his horse to the nearest Army post and thereby saves the train. Black Roger is killed, and Jack is united with Nancy.