Tom Craig (John Wayne), a handsome physician in the goldrush days, discovers that Sacramento politician Britt Dawson has become wealthy from forced tributes levied on ranches. Irate and incensed, he leads the rancers in a successful revolt against the unfair taxes. In retalition, Dawson viciously taints a tonic prescribed by Tom, and a patient is killed. Dawson hides the evidence and incites the mob into a furious race against Tom claiming he's an unfit physician. When gold is discovered at Sutter's Mill, the announcement distracts the crowd, saving Tom from being lynched. How will the local residents feel about Tom when he's the only doctor in town especially when a terrible epidemic breaks out? Will Dawson still be able to make good on his attempts to destroy Tom? The outcome will have you on the edge of you saddle as the action builds to an exciting conclusion.