Narkose

Stars Jack Trevor, who was a British actor who was a star in German cinema. So much so that he stayed on when the Nazis came to power and did propaganda work for them against his own country. Regardless, he was a capable silent actor. He is the one that gets the most out of this drama. One that doesn't strike too hard. Uses the same premise as Letter from an Unknown Woman (1948), with some alterations, but still it's pretty dreary most of the time.