Un caso d'incoscienza (1985)

In Italy, set in the early 1930s, a missing Swedish millionaire (Erland Josephson) is the target of a journalist (Rüdiger Vogler) who sets out to discover exactly what happened to the man and whether or not he is still alive. The biggest lead he has is the millionaire's attractive mistress (Brigitte Fossey), and the story takes off from there.