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The Sioux Indians, led by Chief Four Horns, flee to Canada following the slaughter of General Custer's troops at Little Big Horn. They are intercepted by Inspector William Gannon of the Royal Northwest Mounted Police, who tells them that they may remain in Canada provided they obey the laws. The Indians agree, but trouble arises when Montana rancher Frank Boone and three of his gunmen come north to recover some horses they believe were stolen by the Indians. When Boone and the gunmen massacre a small village of Sioux and abduct a white squaw, the Mounties, fearful of reprisal by the Sioux, quickly take the marauders into custody; however, they escape, taking the white squaw as hostage. The Mounties pursue them, and in the gun battle that follows, the woman is killed while saving Gannon's life. The escaping men then reach the top of Buffalo Cliffs. There they are confronted by the Sioux, who start a horse stampede and drive Boone and his men over the edge of the cliff. With peace restored, the Mounties return to their headquarters.