Craig and Larsen play brothers (one good, one evil) who are forced to flee to Canada after causing an uproar in a high-stakes poker game. Starving good brother Craig convinces evil brother Larsen that they should join the Royal Canadian Mounted Police. The Mounties take the strangers due
to their detailed knowledge of the Sioux Indians, who have been on the warpath and are trying to convince the normally peaceful Blackfoot tribe, led by Ankrum, to join them. Larsen steals some furs from a trapper he has murdered and fakes the evidence so that it appears that Ankrum's son, Marion,
did the killing. Craig is suspicious and, taking his Mountie code of honor seriously, ...