While crossing the Yuma Desert on their New York-to-San Francisco journey, the Ridgeleys rescue Pete, a Mexican, just as he is about to die of thirst. The man later shows his ingratitude and is driven from the camp. The Mexican returns. Stealing Don's rifle and horse, he shoots and seriously wounds his benefactor. Before making his escape, Pete empties the water bottles. Fearing lest she and Don perish of thirst, Cleo mounts her horse and accompanied by Major, her collie, goes in search of water. While she is gone, Pete returns to the camp with a band of Mexican rebels. The latter carry Don away with them as prisoner. Later, the rebels get into a battle with a body of Mexican Federals and are defeated. Pete and Don are captured. To save himself, the Mexican declares that Don is the leader of the rebel band. Overcome by heat and thirst, Cleo topples off her horse. Major tries to revive his mistress. Failing, he bounds away. He attracts the attention of some prospectors. Their curiosity...
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