In the Canadian Northwest near a settlement fort, Sgt. Jim Brent (Preston Foster) and Ranger Dusty Rivers (Gary Cooper) vie for the attention of government nurse April Logan (Madeleine Carroll), the sister of Constable Ronnie Logan (Robert Preston). However, the men band together to stop whiskey runner Jacques Corbeau (George Bancroft) from instigating a native uprising by preventing the massacre of a Mounted Ranger unit, whose demise would leave the settlers completely undefended.