After sinking many helpless merchant ships in Canadian waters, a Nazi U-boat is trapped and sunk by the Canadian Air Force. The only survivors are a fanatical Nazi captain and his five crew, who had been sent ashore to reconnoitre before the attack.
They stumble across an Eskimo village where Scott, Peter and his Eskimo servant live. Also present is Johnnie, a French trapper, who panics when held at gunpoint and is shot by one of the Nazis. An emergency plane is sent to investigate, but is hijacked by the Germans who intend to fly to neutral America. When the plane arrives, there is a scuffle but the plane manages to take off. Shortly afterwards the plane crashes and one of the Germans is killed.
Will the Nazis be caught before they kill again?