Seeking Indian Joe, suspected of murdering the father of young Buddy Hazlet, Bob Merrill and his friend Shorty, secretly enter the stronghold of the Pecos gang. They learn that the actual killer is Tom Marsden, foreman of the Merrill ranch and a member of the gang. Bob's sweetheart, Peggy Bradley, tells him that Buddy and Shorty have been captured by the gang. Bob frees his friends and, when the gang returns, fires on them with their own machine guns. They are captured, Marsden confesses to the murder, and Bob wins the love of Peggy.