La ligne de démarcation

In a small village in the Jura, split by the river Loue, the line of demarcation between Nazi-occupied France and the free zone, a French officer Pierre (Maurice Ronet) is released by the Nazis to find his chateau converted into a German command centre. His wife Mary (Jean Seberg), a British-born aristocrat and supporter of the French resistance, risks her life to aid the movement, while Pierre is forced to cooperate with the enemy. As the Nazis intensify their activity against the resistance, Pierre's allegiance is tested, ultimately leading to a dramatic confrontation with the Gestapo.