Stalag 17

Billy Wilder, 1953, bw (8.6*)
William Holden stars as a gritty POW in WW2 Germany in perhaps his finest role, winning an Oscar® for best actor. Apparently the barracks in which he's placed has a stool pigeon supplying information about prisoner's escape plans to the guards. Holden is a suspect because he's not only a loner, but appears to have a thriving black market exchange going on as well.

Another classic from master director Billy Wilder, who actually fled to the U.S. from Austria to escape the German invasion. Here he has made a psychological war film that's as much about what war does to men's minds as their bodies. Shot in a film noir style with many night scenes, a war classic. #208 on the IMDB top 250.

Wilder is one of the great directors, here's a small list of his best films:
The Front Page, Double Indemnity, Sunset Boulevard, Lost Weekend, The Spirit of St. Louis, One Two Three, Ace in the Hole, Sabrina, The Apartment, Some Like It Hot, Witness For the Prosecution, The Fortune Cookie.