The Counterfeit Traitor is a 1962 spy thriller starring William Holden. I’m covering it solely for a couple of scenes.
Holden plays Eric Erickson, an apolitical American everyman living in neutral Sweden in the early days of WWII. Allied intelligence blackmails him into working as a spy in Nazi Germany. While slowly paced at the beginning, the tension picks up as Erickson sinks deeper into his cover and becomes entangled into the war whether he wants to or not.
Inevitably, Erickson’s cover is blown, and he has to depend on the resistance network to get him back to Sweden with vital intelligence. His backup contact is just a street address in Berlin. This turns out to be in the city’s red light district, with sex workers standing on the street or posing in windows.