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In New York, Roy Rogers and The Sons of the Pioneers rehearse for record company executive J. J. Cardigan and his assistant, Vera Graham. Cardigan signs them for a big contract but Roy soon realizes that the crooked executive has taken all their money. Soon after, a telegram arrives announcing that their old friend Gabby Whittaker has had a stroke and that they must return to their ranch in Oklahoma immediately. Desperate for money, the boys turn to singer Peggy Lane, whose family has had a long-running feud with the Whittakers. Peggy reluctantly lends them the money, but is furious when afterward she receives a telegram stating that the feud is in full swing and that she must rush home. In Oklahoma, the town is readying for the annual celebration of the Oklahoma Land Rush. At Gabby's, Roy discovers that the old man is not really sick but tricked the boys into coming because he thinks the Lanes are stealing the Whittaker horses. When Roy and Gabby find a Whittaker horse on Lane property and confront the Lanes, Grandma Lane and Peggy see that Gabby is healthy and shoot at them. On the way home they pass a camp that Gabby says Jim Gardner recently bought after he discovered water on the land. After Gardner's men refuse them water, Roy buys water from Little Bird-on-the-wing, who reveals that her new husband, Chief Red Feather, has struck oil nearby and that she sells water to Gardner. Suspicious, Roy sneaks back to Gardener's camp and finds oil in his water tanks. On the day of the celebration's big final event, the wagon race, both Grandma and Gabby offer up as prizes their respective halves of a stretch of land called Lone Valley, on which Gardner now resides. Roy rushes in at the last minute to tell Gabby that there is oil on that land, but Gabby realizes it is too late to rescind his offer. The boys then spot Cardigan in town and get back the money he stole in order to repay Peggy. Grandma, however, is still not convinced about the Whittakers' innocence, so Roy tells them to follow him to confront Gardner. Although Gardner denies all knowledge of the oil on his land, Peggy sees it for herself. The Whittakers and Lanes agree to uneasy truce, unaware that Gardner is plotting to stop the fast Whittaker wagons during the race. Gardner burns their wagons, then covers the replacement wagons in gas, causing them to explode when he starts a brush fire at the beginning of the race. The only Whittaker wagon to get out is Gabby's. At the halfway rest stop, Grandma's last remaining driver quits, so Roy offers to drive the Lane wagon and split any winnings between the two families. Just as Roy is about to win the race, Gardner's man climbs onto his wagon and harms it. Gardner wins, but that night at the celebration, a newsreel film of the race is projected, revealing Gardner's treachery. After Roy is proclaimed the winner, he splits the land with the Lanes, and the feud ends.