Trail of the Mounties

In the Canadian Northwest, trapper Angus McVane is accosted by a gang of fur thieves. Although the gang's leader, Johnny Sanderson, argues to spare McVane's life, one of his men plunges his knife into the hapless trapper's back. Soon after, at the headquarters of the Royal Canadian Mounted Police, the constable assigns Sgt. David "Lucky" Sanderson to investigate McVane's murder and the disappearance of another Mountie sent to look into the rash of thefts plaguing the territory. In the woods, meanwhile, Johnny is about to snatch a pile of pelts when some trappers spot him. Sprinting into the trees, Johnny commandeers a horse ridden by Kathie McVane, the dead man's niece. Later, as Lucky nears town, he hears the sound of gunshots and hurries to their source, where he finds John "Gumdrop" Mason, a grizzled old trapper, under attack by two members of Johnny's gang. After a scuffle in the river with Lucky and Gumdrop, the thieves escape and report to Johnny that the Mountie was his exact double. Realizing that his identical twin brother must be in the vicinity, Johnny dons the missing Mountie's uniform and decides to masquerade as his law officer brother. After their tussle with the thieves, Gumdrop takes Lucky to the McVane house and there Kathie mistakes him for Johnny and slaps him. To divert Lucky, Johnny sends Nick, one of the gang members, with a cryptic note directing the Mountie to a corpse at Twin Forks. After Lucky and Gumdrop paddle downstream to Twin Forks, Johnny, disguised as Lucky, rides to a trapper's camp and offers to deliver his furs to the trading post, and the relieved trapper turns his pelts over to him. Finding only a harmonica playing hermit at Twin Forks, Lucky returns to town and asks Kathie why she slapped him. When she accuses him of stealing her horse, he realizes that the wayward twin brother he has not seen in ten years must be nearby. Days later in town, a group of trappers heartily thank Lucky for protecting their furs. Puzzled by their gratitude, Lucky then spots Nick as he gallops out of town. Jumping onto his horse, Lucky catches up to Nick and arrests him. In town, meanwhile, the trappers discover that their pelts never reached the trading post. When Lucky appears with his prisoner, they accuse him of stealing their furs and prepare to lynch him, and in the commotion, Nick escapes. As Kathie pleads for Lucky's life, Gumdrop comes to his defense with a shotgun and asserts that Lucky was with him at the time the furs were stolen. Lucky then gallops off in pursuit of Nick, who arrives at the gang's hideout with the news that the Mountie is on his trail. Despite Johnny's objections, the gang decides to ambush Lucky as he rides through the pass. Johnny stays behind and is surprised by the arrival of Lucky, who has ridden in on a back trail. When Lucky finds the dead Mountie's coat in Johnny's saddlebags, Johnny denies killing him, but Lucky orders him to put on the garment anyway. Just then, Gumdrop and Kathie locate the hideout and call to Lucky, distracting him. Johnny seizes the opportunity to escape, and still wearing the Mountie's jacket, deliberately rides into the ambush. Mistaking Johnny for his brother, the gang guns him down. After a shootout with the gang, Lucky hurries to Johnny, who with his dying breath, admits that he took the bullet for his brother.