Oil is discovered on the Countess de Elberca's estate in a mythical Spanish American country. Mercedes McDonald, her niece, falls in love with Sandy Buchanan, a young Scotch engineer hired by the countess. Don Felipe, a neighbor in need of money to avoid arrest for embezzlement, conspires with his nephew, the Duke of Othomo, for the latter to wed Mercedes. The aunt approves the suit. Felipe and Othomo attempt to kill Mercedes' sweetheart, but Buchanan, with the aid of her brother and a traveling American circus, foils their plans. Felipe and Othomo are killed by the circus animals, and the aunt consents to Mercedes' marriage to Buchanan.

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