The Captive Heart (1946)

After the evacuation at Dunkirk, June 1940, some thousands of British prisoners are sent to German P.O.W. camps. One such group includes Capt. Geoffrey Mitchell, a concentration-camp escapee who assumed the identity of a dead British officer. To avoid exposure, Mitchell must correspond with the dead man's estranged wife Celia. But eventual exposure seems certain, and the men must find a way to get him out. If he reaches England, though, what will his reception be?