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This melodramatic quickie was adapted from a novel by Reginald W. Kaufmann. The scene is a mythical South American country, where beautiful heiress Dolores Valdez (Dorothy Devore) is being forced into a marriage of convenience by her sinister guardian Don Diego (Eric Mayne). Handsome American doctor Dan Stone (Malcolm McGregor) who previously rescued Dolores from a shipboard masher, is brought into the intrigue when he is hired to take care of a mysterious patient, who never emerges from his bedroom. Eventually, Dan discovers that his patient is an engraver of counterfeit plates, held prisoner by Don Diego and his partner, Dolores' oily fiancee Ortego (George Cheseboro). Rallying a company of American Marines, Dan rescues Dolores from the altar and routs the villains.