Masha, a young Russian emigrant traveling to the U.S., is saved from an officer's advances by civil engineer David Harding. Upon landing in America, J. J. Walton, a self-made political boss and contractor, pursues Masha and hires her as his maid. She leaves after the first night, but becomes his mistress after Walton promises her an education and marriage. Sometime later, David defeats Walton in a bidding war for a contract to build a dam in Arizona. Intent on ruining David, Walton dynamites the dam while Masha distracts the engineer. Although Walton takes refuge, he is drowned in the floodwaters. David and Masha survive, and confess their mutual love.