Leary is using the Express Agent's liking for alcohol to enable his men to steal insured packages. Then he claims the insurance. Railroad Agent Hartley is sent to investigate and suspecting Leary, he and the Sheriff plan to trap them the next time they try their scheme.
There is trouble on the Bar D ranch as cowhand Mile Ahead plans to rustle the herd. He starts a fire on the opposite side of the ranch to keep the hands busy and also kidnaps the new school teacher. Fighting the fire, Foreman Denver leans the cattle are gone and going after Mile Ahead, learns the teacher is a prisoner in the school and the fire that is now out of control is heading her way.
Cardsharp Jack Cardigan decides to go straight when he meets Doris Bradfield, but is forced to use his talents on behalf of her dad, whose land-grant title has fallen into the hands of Jed Harden through the gambling weakness of Bradfield's son Tom.
In a trapper's cabin, Sergeant Stone finds a fellow Mountie murdered and is given the assignment of locating the killer.
Three cowboys try to stop a crook from defrauding an orphan girl out of her money.
