I saw this movie 3 times in blackout conditions in 1944 on the German front just before the Battle of the Bulge. That was 3 separate times and apparently it was the only movie on the whole front. I just viewed it again today, 2002, and showed not a bit of age. It is exciting though it is 75% talk and 25% action. But what talk: Greenstreet and Lorre!! All the parts are finely chosen and hand polished until they fit the space perfectly. They don't make them like this anymore. Put it with Casablanca, Maltese Falcon (Bogart one), Key Largo, etc. If you like these, you'll love the Mask. And Col. Haki is great and in a previous movie was played by Orson Wells, i.e., another Eric Ambler movie. It is the Balkans in 1938 and background shots are exciting. If you don't know Faye Emerson, you will wish you did. Rush out and rent it.
Review of The Mask of Dimitrios
