The Mask of Dimitrios is an interesting early bit of film noir, made when the genre was still experiencing birth pains. What makes this film so interesting is its European setting. But it is certainly a Hollywood product, though the night shots of the seedy side of romantic European cities are pretty convincing considering they were made on sets on the studio lot.
Mystery writer Peter Lorre teams up with scoundrel Sidney Greenstreet to unravel the mystery surrounding the life and death of international criminal/spy Dimitrios, played by Zachary Scott. If you need a reason to watch this movie, the team of Greenstreet and Lorre should be enough. But there is much more. Even the minor characters are well developed helping to make this story an intriguing one, although the plot elements are mostly familiar.
If you have never seen The Mask of Dimitrios, I recommend it.