The Great Impersonation (1942 film)

The Great Impersonation is a 1942 American drama film directed by John Rawlins and starring Ralph Bellamy, Evelyn Ankers and Aubrey Mather. It is an adaptation of the 1920 novel The Great Impersonation by Edward Phillips Oppenheim with the setting moved from the early 1910s of the novel to the Second World War. It was made by Universal Pictures and was a remake of their 1935 film of the same name. German intelligence believe they have planted an agent into the British establishment by murdering a British aristocrat Sir Edward Dominey in Africa, and replacing him with his doppelganger. However, over time, they begin to have doubts about just what happened in Africa and if the man claiming to be Dominey is really an imposter.

One night when they are in the jungle camp together, England declares war on Germany and they conclude that they are now each others enemies. Ragenstein orders his right hand man, Dr. Schmidt Ludwig Stssel, to kill Dominey, and sets out on a long journey to London to impersonate Dominey and spy for the Third Reich.Some time later, the German High Command sanctions Ragensteins mission to go undercover into Britain and infiltrate the English upper ranks. His first task is to find out the defence plans for the English channel. He meets with another German agent, Frederick Seamon Henry Daniell, who is a native Brit. Ragensteins sets out to get the plans from a relative to Domineys wife, Sir Ronald Clayfair Aubrey Mather, who is the British Minister of Home Defense. ........

Source: Wikipedia