 Salon Kitty was a Berlin brothel, secretly run by the "Sicherheitsdienst" (the intelligence agency of the SS) to spy on its clientele, who were often prominent German government officials or military officers.Many of the main characters are based on real people (though some of the characters carry different names).Dialogue in the series is in English and in situations where Schulz interacts with English characters, his delivery is deliberate, like that of a non-native speaker not used to speaking English, or attempting to conceal his native accent.