Le Combat dans l'île(1962)

Overview:

The charismatic, surly son of a wealthy industrialist, Clément, leads a double life as a member of a right-wing extremist organization. When he’s ratted out after a failed assassination attempt on a prominent politician, Clément and his long-suffering wife Anne flee Paris to the idyllic country home of his childhood friend, pacifist print-maker Paul. As affection blossoms between Paul and Anne, the emotional, as well as political tensions, soar and eventually explode.