The Passion of Slow Fire (1962)

Stéphane Blanchon lives a quiet life in Switzerland with his wife Christine until a young American boarder named Belle who was living with them is found murdered Despite Stéphanes innocence the evidence points to him and he learns that Belle harbored romantic feelings for him Suspicions mount against him even Christine thinks he is the culprit Stéphanes sanity begins to crumble and he lashes out in unprecedented ways