Les Amants du Tage (1955)

Daniel Gelin plays a soldier who is acquitted after committing a crime of passion. Relocating to Lisbon, and still feeling remorse over his impulsive killing of his faithless wife, Gelin manages to find love in the form of gorgeous widow Francoise Arnoul. Alas, it turns out that Arnoul has a sordid past of her own, leaving our hero sadder but wiser.