Dan Stanton and Condon are foreclosing on a group of ranchers in order to gain a land-monopoly. They have one of the ranchers, whose property supplies the others with water, killed. Ann Jennings, niece of the rancher, sends for U. S. Marshals Nevada Jack McKenzie and Sandy Hopkins, who organize the ranchers who take over the dead man's property and blast the dam releasing needed water to all the ranchers.Nevada and Sandy trace the origin of the situation to the fact that a railroad company is planning a spur-line through the valley and only three men are in possession of this information. Nevada and Sandy, aided by the sheriff, round up Stanton, Condon and their gang members.