Madame (2004)

Rome, 1933. Sarah (Sonia Aquino), an American aristocrat married to a wealthy businessman, falls in love with Guido (Paolo Seganti), a young engineer. The two begin an overwhelming relationship, so much so that she declares herself willing to leave her husband. But suddenly he disappears without leaving a trace. She then hires an investigator to find out if he cheats on her with another woman .