A world war 2 POW film, with the main story being one of trying to find a spy in the barracks who is feeding the Germans all the information in the barracks that would be useful to them.
It seems fairly obvious to the people in the barrack that the informer is the guy who runs all the betting and other small business things. While it’s fairly obvious to the viewer, that it’s not him, but, we’re not sure who.
It’s also got a fair amount of comedy in this film, and is fun to watch, even though the setting is a POW camp.
I give it 8/10