Hunting the desert for his daughter, Jonas Warren finds the man who took her away, who then produces a marriage certificate to pacify Warren's anger. After the husband finds a gold mine and uses the certificate to mark it, they die in a sandstorm. Later, Dick Gale, an Easterner in search of adventure, rescues his friend Captain George Thorne and the captain's sweetheart Mercedes Castenada from Mexican bandit Rojas. Dick takes Mercedes to Jim Belding's ranch, where Dick falls in love with Belding's adopted daughter Nell. When Rojas arrives with a band of outlaws, Dick and the ranch cowboys escort Mercedes to the mountains, led by Dick's Yaqui Indian friend. After the Yaqui throws Rojas off a cliff and locates a water source for the ranch, he shows Nell the gold mine. The marriage certificate of her parents proves that the mine is hers. Since she now knows she is not illegitimate, she can marry Dick.