In the north-western frontier near the Canadian border, the Oseka tribe depends on the majestic salmon from a nearby river. For centuries they smoke these fish to stock food for the year, living in harmony with the Royal Canadian Mounted Police. It’s a life that Roy Rogers, Roy Rogers, has long championed as a close ally and friend; he leaves his post to join the Office of Indian Affairs in hopes of safeguarding their traditional way of life even more effectively.
The peace is tested when the cannery owner, Mr. Banning, informs the Oseka head, Nagura, Noble Johnson, that a salmon cannery will be built right by the river. Nagura worries that the new operation could wipe out the river’s fish and leave his people with nothing. Banning tries to reassure him, insisting there will be enough for everyone and that Osekas could be hired to work the traps. Yet the reality soon proves harsher: the traps set by Banning’s cannery (and one on the Canadian side) haul in almost every fish, leaving the Osekas with little to nothing.
When Nagura complains, Banning and his foreman, Stagg, propose a looming solution that would push the Osekas further north—out of the way—while urging the tribe to abandon fishing for hunting. The tension intensifies as Henry Gates, District Supervisor at the Office of Indian Affairs, receives a troubling report from Ann Keith, Penny Edwards, the district nurse, and decides that Roy Rogers must intervene to prevent violence. Gates fears the Office of Indian Affairs may be forced to move the Osekas onto a reservation unless order can be restored.
Rogers arrives with a practical plan, bringing a herd of cattle to prevent starvation and, with Ann Keith at his side, working to avert a larger clash. The cannery managers are ruthless in defending their profits, and the foreman even hints at murder as a means to silence Roy Rogers. Banning pretends to seek compromise, letting a trickle of fish pass through for the Indians to catch, all while painting the Osekas as the troublemakers to justify further coercion.
The situation worsens when a Canadian Mountie is found dead. Nagura—seen taking salmon from traps—is suspected, a suspicion that conveniently serves Stagg, who is in fact behind the murder. In a calculated move, Stagg and Banning decide to murder Nagura to erase evidence of Stagg’s guilt. Their plot is overheard by a wary friend of Roy’s, who relays the information. Roy insists on bringing Nagura to Deputy Sheriff Hartley for extradition to Canada, but he also aims to prove the elder’s innocence and to push for cross-border cooperation in drafting international laws to protect the salmon and ensure a fair share for all.
The Osekas, angered by Nagura’s imprisonment, stage a jail break to free him, only to discover Hartley is safe and Nagura has vanished. With determination, Roy and his friends rescue Nagura and escort him to the Royal Canadian Mounted Police, exposing Banning and Stagg’s misdeeds. The two schemers had plotted to destroy the Canadian cannery to fulfill a vast contract and fatten their profits before any protective laws could be enacted. In a tense sequence, Stagg’s attempt to burn the Canadian cannery is witnessed by the Mountie, who is killed, and Stagg and his men turn their attention to Hartley, attempting to seize Nagura to pin the crime on him.
As the Mountie comes to accept Nagura’s innocence, the truth about Banning and Stagg’s plot emerges fully. A final confrontation unfolds as the arson scheme is exposed and foiled in a dramatic shootout. The Osekas celebrate the removal of the last of Banning’s traps, and Roy Rogers confirms that new international treaties to protect the salmon run will come into effect before the next season, ensuring that everyone will receive their fair share. The river’s balance is restored, and the people’s way of life endures, guarded by a renewed spirit of cooperation across borders.
