This is a great example of Ealing Studios finest. A British prisoner of war assumes the identity of a dead soldier having himself escaped from a Concentration camp. He has to write letters home (to the wife of the dead man) because the Germans were suspicious of his lack of correspondence to his family. Inevitably his true identity is exposed, and he attempts to escape from the camp. When he is eventually returned back to good old Blighty, the lady with whom he has corresponded is waiting for her husband to appear from the crowd, but our hero (michael Redgrave) has to tell her the truth. With Jack Warner, Basil Radford and Mervyn Johns, it's a great cast for a very British story.