Wallenberg (Helmut Berger), an ambitious Nazi SS commandant, devises a plan to select a special group of female informants in order to plant them as prostitutes in a high class brothel on the eve of World War II in order to collect intel on various important members of the Nazi party and foreign dignitaries who frequent the establishment. The selected SS auxiliaries are then group tested with SS men to assess their suitability. The brothel is then purged of its regular girls and Kitty (Ingrid Thulin), the owner and Madam of the brothel, is forced to comply and allows her original girls to be deported as the building gets wiretapped with listening devices and other surveillance equipment, after which the new girls proceed to spy on their illustrious clients. However, when one of the informants named Margherita (Teresa Ann Savoy) discovers that the surveillance project resulted in the death of her lover, Luftwaffe pilot, Hans Reiter (Bekim Fehmiu), she enlists Kitty to help her take down Wallenberg. Margherita entraps Wallenberg via a recording where he tells her that he has the dirt on all the top Nazi hierarchy and intends to bring them all down. As a consequence, Wallenberg is executed for treason.