Bill Shannon, an engineer in charge of a dam project in the Sierras, is offered a bribe to sell out to Morse, a Wall Street promoter who wants the damsite for his new railroad. Unable to succeed, Morse arrives at the site with his fiancée, Anne Wilmot, and his sister. There Shannon rescues Anne from a swift mountain stream, and she ultimately wins his affection and adopts his position on the dam controversy. Failing to buy off Shannon, Morse conspires with Charles Burkthaler, a rancher, to dynamite the dam. Overhearing the plot, Anne goes to warn Shannon; but he leaves when he hears her cajoling Morse, who has become jealous of his attentions. Anne discovers the men wiring the explosives, but in severing the wire leading to the dam she is buried beneath rubble from the explosion; following a fight, Shannon settles accounts with Burkthaler and Morse, and Anne is rescued by his men.