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Shirley Martin finds that Weylan has diverted the water from the valley and her cattle are dying. First she and her foreman Bob Lawson go to court. This fails when Weylan's men keep the ranchers from testifying.

Sandy Doyle, gambler and political chief of a small border town, seeks to gain control of the Bar-X Ranch, owned by Rufe Rickson, to further some undercover activities of his own. He counts on Rickson's inability to stay away from gambling as the means to his ultimate success. Government investigator Oliver Shea and his assistant, Dan Haggerty, start a fight in Doyle's place when they see Rickson being cheated and are invited to the Bar-X where Oliver and Helen Rickson, Rufe's daughter, discover interest in each other and Dan finds himself pursued by Bell, the ranch cook. Sheriff Larson brings the prize money for the $5,000 race of the Rodeo Association, and that night it is stolen from her safe. The next day, Doyle says it was paid to him by Rickson for a gambling debt. Realizing that she must be free in order to prove her father's innocence, and that now her horse, Snowy, must win the race, Helen confesses to the theft and makes good her escape. Her sleuthing establishes that Doyle has been engaged in ore-smuggling activities, and his intent to gain the Bar-X is because the ranch offers a perfect crossing place for his gang, who salt the smuggled silver into a non-productive mine and ship it to the Mint as domestic production.

Tolen is after Harkins' ranch where his men have found gold. After they kill Harkins, Dorothy and Dick step in and discover that the gold actually washes down from Tolen's own ranch.