Adventerous engineer Robert Clay, goes to a South American country on an assignment by rich American Ted Langham to open an iron mine. While Robert is there, the unscrupulous General Mendoza tries to convince him to divide the mine's assets between them and President Alvarez. Mendoza starts a revolution against Alvarez when he and Clay will not go along with the plan, but he eventually is defeated after a long battle. Clay then is able to pursue his relationship with Hope, Langham's daughter, who has accompanied her father to South America.

Orphaned sisters Kate and Irene are separated as children, but each keeps half of their mother's wedding ring. Years later Irene marries John West, the head of a munitions camp. Kate, as fate would have it, happens to run the saloon in the camp and she and Irene become friends, but neither has any idea that the other is her long-lost sister. Matters take a turn for the worse, however, when Kate starts a romance with Cliff, Irene's adopted brother--a relationship that Irene strongly disapproves of. Complications ensue.