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Fur traders are terrorizing the section of the North West patrolled by Jim Cameron of the Royal Canadian Mounted Police. As Jim rides to meet the recruits being led by his brother, Constable Bob Cameron, the raiders, led by Pierre Ledoux, attack the trading post and kill its owner Moreau. Bob and Jim return to find the post in flames, and Jean Duncan hiding in the back room. Although Jean has witnessed Moreau's murder, she is not certain that she can identify the killer, and the Mounties decide to accompany her to the town of Moosehead, where her uncle, Mart Duncan, lives. At Inspector Wylie's suggestion, Jean agrees to take a job at her uncle's store, where she waits for the killer to appear. Unfortunately, Wylie is unaware that Duncan is the brains behind the raids and hence, Jean's life is in danger. A short time later, Ledoux appears, but because Jean is unable to positively identify him as the killer, Jim releases him. For failing to jail the suspect, Jim is temporarily suspended from the service and begins to act suspiciously. After he shields Ledoux from the Mounties, Ledoux takes him to Duncan, who is about to flee town with the gang's money. A fight ensues, and Jim is arrested for trying to rob Duncan. Believing that Jim has forsaken his allegiance to the law, Ledoux helps him escape from jail and takes him to the raiders' forest hideout, where Jean is being held prisoner. After she finally identifies Ledoux as Moreau's killer, Jim stages a fight so that she can escape and ride for the Mounties. Suspicious of the fight, Ledoux is about to shoot Jim in the back when Bob arrives with his officers to arrest the raiders, and Jim reveals that he has been working undercover to trap Ledoux and his gang. Reinstated as a Mountie, Jim is promoted to captain and awarded a month-long furlough so that he can marry Jean.