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Gene Autry, his sidekick, Frog Millhouse, and their men have just completed rounding up Gene's large herd of horses when Gene receives a telegram from his brother Tex, who is mining diamonds in South Africa. Tex states that he and his partner, Edward Barclay, have just found a big strike in the Valley of Suspicion and are desperately in need of horses. He urges Gene to bring as many horses as possible and to contact John Cardigan, the saloon owner who staked Tex and Barclay, as soon as he arrives in Dunbar, South Africa. While Gene and Frog are transporting the animals across the ocean, Tex and Barclay are returning to Dunbar from their mine. On the way, they are ambushed by Cardigan's men, for Cardigan wants sole control of the mine, and Tex flees after Barclay is killed. Several weeks later, Gene and Frog arrive at Dunbar and arrange for Barkey McCuskey, a small-time English con artist, to be the auctioneer when they sell their surplus horses. Gene is worried because Tex is not in Dunbar, and stoutly defends him when Cardigan says that Tex is being sought for the murder of Barclay. Gene grows suspicious of Cardigan when he sees that Cardigan has tampered with another telegram from Tex, and Cardigan in turn grows jealous as Gene becomes friendly with saloon singer Gwen, who is Barclay's daughter. At the auction the next day, Gene sees Cardigan's servant Namba wearing the belt buckle that Gene gave to Tex, and Gene's suspicions grow. Cardigan's henchman, Craig Johnson, plans to get rid of the Texans that night, and he arranges to have them arrested after he trades an unwitting Frog some diamonds for a horse. Gene and Frog are mystified by their arrest, but the police explain that it is against the law to have uncut diamonds without a license. Cardigan promises to get them a lawyer, and the next day, the police try to take Gene and Frog to Kimberly for trial. Gene and Frog escape and find Cardigan as he is trekking through the jungle with Johnson, Gwen and Barkey in search of the mine. The next day, the group is captured by natives and brought before their chief, Bosuto. Bosuto is about to order that they all be sacrificed, but Frog wins him over by teaching his children to sing. The chief agrees to let the others go if Frog stays to teach more music to the children, and so Frog stays behind with Cardigan when Gene leaves. While Gene, Barkey and Gwen are led by the treacherous Namba to Cardigan's jungle hideout, the police free Cardigan and reach the hideout first. Gene spots Tex, who is being held as a slave, then frees him and the other laborers. Cardigan and Johnson use Gwen as a hostage and attempt to escape, but Frog catches Johnson while Gene battles with Cardigan, who falls from a cliff to his death. The police arrive and capture the rest of the gang. Later, on the boat returning to the United States, Gene and Gwen kiss as Frog sings with Bosuto's children.