Nazi Agent

Conrad Veidt plays two roles here, as a self-assured Nazi and a mild-mannered Ally. The brothers confront each other and the Nazi is murdered, but now the surviving brother must impersonate the Nazi in order to deflect attention from his crime and also to gather information that can help the Allies.

This is an intense movie to watch, and thanks to being made by MGM it is very polished. I saw it screened at Cinevent in 2013 and remember it vividly a year later. Conrad Veidt could have ruined the movie if he were a lesser actor, but he handles both parts remarkable and never gives the audience a reason to doubt him.