Johnny Mack returns to Pony Mesa, where his friend Alibi gives him a letter from Mary, granddaughter of his former boss Brimstone, asking Johnny to forget his quarrel with the old man and return and save the ranch. On the way there, Johnny shoots Steve Dallas after the latter kills the stagecoach driver in a robbery attempt. The outlaw's 13-year-old brother Larry accuses Johnny of killing Steve without reason, not knowing his brother was a wanted outlaw for a bank holdup. Johnny persuades Brimstone to let Larry stay at his ranch. Steve's outlaw partner, Ed Stone and his henchmen, Barstow and Joe, are searching for the missing bank-robbery money. Larry finds it in the lining of a coat belonging to Steve and is on his way to the sheriff when he is intercepted by Stone and his gang.