I See a Dark Stranger

I See a Dark Stranger released as The Adventuress in the United States is a 1946 British World War II spy film with touches of light comedy, by the team of Frank Launder and Sidney Gilliat, and starring Deborah Kerr and Trevor Howard.

Miller turns out to be a secret agent assigned to break Nazi spy Oscar Pryce David Ward out of a British prison in Devon. When, by sheer chance, he runs into Bridie again, he recruits her for his task. She gets a job at The George, a hotel and bar in nearby Wynbridge Vale, and becomes acquainted with a sergeant, who unwittingly provides her with information about the prisoners impending transfer to London.This is the opportunity that Miller has been waiting for. However, he is disturbed by the arrival of Lieutenant David Baynes Trevor Howard, a British officer on leave. Since there is little to attract anyone to the town, he suspects the newcomer of being a counterintelligence agent. He orders Bridie to distract Baynes on the day of the transfer by persuading him to take her for a day out in the countryside. It turns out Baynes is merely there to gather material for his thesis on Oliver Cromwell, whom Bridie loathes intensely for his conquest of Ireland. ........

Source: Wikipedia