Heart of Valor by Alan B. Morris

Hunter Stone and his fellow Mounties are faced with establishing themselves as the law in the North-West Territories. Meanwhile, Reena O'Donnell continues her missionary work among a tribe of the Blackfoot Nation. Together they fight against a common enemy, the dangerous whiskey trade, that is breaking down tribal customs with devastating results. But when the source of the shipments is revealed and shockingly points to someone they know, a direct confrontation with the heart of the evil will lead them down a dark trail of high suspense.
Hunter Stone, a Royal Canadian Mounted Police officer, and Reena O'Donnell, a young missionary, try to find out who is smuggling whiskey into the North-West Territories