Fact1: Bomasch gets anonymous phone call with instructions to go to town of Brightbourne, Fact2: Randall takes Anna to father, Fact3: Anna argues with Randall over attempt, Fact4: Marsen brings them back to Germany by U-boat, Fact5: captors threaten to put her in concentration camp
Output: As German forces take over Czechoslovakia in March 1939, Axel Bomasch James Harcourt, a Czechoslovak scientist working on a new type of armourplating, is flown to Britain. Bomaschs daughter, Anna Margaret Lockwood, is arrested before she can reach the airport and sent to a concentration camp, where she is interrogated by Nazis who are after her father. Anna refuses to cooperate. Soon she is befriended by a fellow prisoner named Karl Marsen Paul Henreid, who says he is a teacher imprisoned for his political views. Together they are able to escape and make their way to London. Anna does not know that Marsen is in fact a Gestapo agent assigned to gain her trust and locate her father. 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 cooperate. 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. Randalls situation is further complicated at the railway station, where he is recognised by a former classmate named Caldicott Naunton Wayne, who is leaving Germany with his friend Charters Basil Radford. Randall denies knowing Caldicott, but Marsens suspicions are aroused. When the train makes an unscheduled stop brought to a halt by a railway station guard played by Irene Handl in an early uncredited bit part to take on troops, as war has just been declared between Britain and Germany, Marsen takes the opportunity to telephone his headquarters to have Herzog investigated. When Marsens superiors call back to confirm there is no Major Herzog, Charters, attempting to use another telephone, overhears that Randall will be arrested when they reach Munich. The two Englishmen barely manage to reboard the train before it leaves. Caldicott slips a warning to Randall, who is thus prepared when Marsen pulls out a gun as they near Munich. Charters and Caldicott overpower first the two guards, then Marsen. After swapping uniforms with Marsen, Randall commandeers a car. They speed up a mountain road, with Marsen and his men in hot pursuit. They reach an aerial tramway; at the other end is neutral Switzerland. Randall manages to shoot all of their pursuers except Marsen, while Anna and the others escape on the tram. Randall then boards the other tram and exchanges shots with Marsen. Marsen reverses the direction of Randalls tram, but he manages to jump to the other tram as it passes. When he hits Marsen in the leg, the latter is unable to reach the controls and stop Randall from reaching safety. Randall and Anna embrace.