Berlin, 1938. Newly-appointed military attaché Noel Macrae and his wife Primrose arrive at the British Embassy. Prime Minister Chamberlain is intent on placating Nazi Germany, but Macrae is less so. Convinced Hitler can be stopped by other means than appeasement, he soon discovers he is not the only dissenting voice in the Embassy and finds that some senior officers in the German military are prepared to turn against the Führer. Gathering vital intelligence, Macrae is drawn to Kitty Schmidt's Salon (a Nazi bordello) and its enigmatic Jewish hostess Sara Sternschein - a favourite of sadistic Gestapo boss Reinhard Heydrich. Sara is a treasure-trove of knowledge about the Nazi hierarchy in a city of lies, spies and secrets. Does she hold the key to thwarting Hitler or is Macrae just being manipulated by her whilst his wife romantically pursues his most important German military contact, Florian Koenig?