No one has ever escaped from Stalag 17, a POW camp for American airmen near the Danube. Maybe that's because there's a spy in barrack four. The German guards seem to know everything that's...

No one has ever escaped from Stalag 17, a POW camp for American airmen near the Danube. Maybe that's because there's a spy in barrack four. The German guards seem to know everything that's happening, before it happens. Most of the American POWs suspect Sergeant J.J. Sefton, whose wheeling-and-dealing rates him special privileges from the camp guards.