Night Train to Munich

Night Train to Munich is a 1940 British thriller film directed by Carol Reed and starring Margaret Lockwood and Rex Harrison. Written by Sidney Gilliat and Frank Launder, based on the novel Report on a Fugitive by Gordon Wellesley, the film is about an inventor and his daughter who are kidnapped by the Gestapo after the Nazis march into Prague in the prelude to the Second World War. A British secret service agent follows them, disguised as a senior German army officer pretending to woo the daughter over to the Nazi cause.

Following Marsens suggestion, Anna places a cryptic newspaper advertisement to let her father know she is in the country. Soon after, she gets an anonymous phone call with instructions to go to the town of Brightbourne. There, Anna contacts Dickie Randall Rex Harrison, a British intelligence officer working undercover as an entertainer named Gus Bennett. Randall takes Anna to her father, who is now working for the Royal Navy at the Dartford naval base. Anna argues with Randall over her attempt to post a letter to Marsen with an informative postmark. It does not matter, as Dr. John Fredericks Felix Aylmer, Marsens undercover superior in London, had tailed her to Brightbourne.Soon after, Marsen arranges the kidnapping of Anna and her father, and brings them back to Germany by Uboat. Their captors threaten to put her in a concentration camp if Bomasch refuses to work for the Nazis. Meanwhile, Randalls proposal to rescue the Bomasches is unofficially accepted. He travels to Berlin and infiltrates the building where the Bomasches are being held, posing as Major Ulrich Herzog of the Corps of Engineers. He dupes Captain Prada and Admiral Hassinger into believing he was Annas lover years ago and can persuade her to get her father to cooperation. Randall spends the night with Anna in her hotel room to maintain the pretense. When the Bomasches are ordered sent to Munich, he plans to accompany them and arrange their escape. However, Marsen shows up just as they are about to leave the hotel he has been assigned to escort them to Munich. ........

Source: Wikipedia