|Eric Portman||Lt. Hirth|
|Leslie Howard||Philip Armstrong Scott|
|Raymond Massey||Andy Brock|
|Finlay Currie||The Factor|
In the early days of World War II, a German U-boat is sunk in Canada's Hudson Bay. Hoping to evade capture, a small band of German soldiers led by commanding officer Lieutenant Hirth attempts to cross the border into the United States, which has not yet entered the war and is officially neutral. Along the way, the German soldiers encounter brave men such as French-Canadian fur trapper Johnnie and soldier Andy Brock .