As the west rapidly becomes civilized, a pair of outlaws in 1890s Wyoming find themselves pursued by a posse and decide to flee to South America in hopes of evading the law.

While the Civil War rages on between the Union and the Confederacy, three men – a quiet loner, a ruthless hitman, and a Mexican bandit – comb the American Southwest in search of a strongbox containing $200,000 in stolen gold.