| I-1 | Hugh A. | Legat | Third Secretary in His Majesty's Diplomatic Service. |
| | Adolf | Hitler | The Führer of the Nazi Party. |
| | | | Führer - German word meaning "leader" or "guide". |
| | Neville | Chamberlain | British Prime Minister. |
| | Pamela | | Legat's wife. |
| | John | | Legat's son. |
| | Diana | | Legat's daughter. |
| | Cecil | Syers | One of Legat's colleagues. |
| | Osmund S. | Cleverly | The Prime Minister's Private Secretary. Aka: Oscar. |
| | Horace | Wilson | Prime Minister's Special Adviser. |
| | Miss | Watson | The woman who Legat shared the smallest office. |
| | Lloyd | George | Former British Prime Minister. |
| | | Wren | Downing Street messenger. |
| | Viscount | Gort | The Chief of the Imperial General Staff |
| | | Newall | Air Marshal. |
| | Admiral | Backhouse | The First Sea Lord, |
| | Duff | Cooper | First Lord of the Admiralty. |
| | Edward | Halifax | The Foreign Secretary. Aka: Holy Fox. |
| | John | Simon | The Chancellor of the Exchequer. |
| | Sam | Hoare | The Home Secretary. |
| | | Gamelin | French general. |
| I-2 | Paul | von Hartmann | Foreign Minister of Germany. Legat's old friend. |
| | | Ribbentrop | Foreign Minister of Nazi Germany. |
| | | Von Nostitz | Worked in the Protocol Department. |
| | | von Rantzau | Supposed to go to London embassy as Second Secretary. |
| | Erich | Kordt | Office of the Foreign Service. |
| | | | Wehrmacht - The unified armed forces of Nazi Germany. |
| | Dr | Schmidt | The Foreign Ministry's chief interpreter. |
| | Nevile | Henderson | Ambassador of the United Kingdom to Nazi Germany. |
| | Ivone | Kirkpatrick | First Secretary of the British Embassy. |
| I-3 | Alec | Dunglass | Parliamentary Private Secretary. |
| | | Wood | The young engineer from BBC. |
| | Colonel | MacFarlane | Military attaché, Berlin. |
| | | Walpole | Former British Prime Minister. |
| | Annie | Chamberlain | Prime Minister's wife. |
| | Joan | Sackville | The fastest typist in the Garden Room. |
| | Alexander | Cadogan | Under-Secretary at the Foreign Office. Aka: Alec. |
| | | | Luftwaffe - Aerial warfare branch of the German military. |
| | | Göring | General in the German Army. |
| I-4 | Ernst von | Weizsäcker | State Secretary. In charge of the German Foreign Ministry. |
| | Frau | Winter | Weizsäcker's senior secretary. |
| I-5 | Ralph | Wigram | Legat's former superior in the Foreign Office Central Dept. |
| | Lady | Colefax | Interior decorator. |
| | Stanley | Baldwin | Former British Prime Minister. |
| | Miss | Marchant | Worked for Sargent as the senior secretary. |
| | Orme | Sargent | Cadogan's deputy. |
| | Franz | Ferdinand | Archduke of Austria. |
| | Edward | Bridges | Cabinet Secretary. |
| | Lord | Perth | British ambassador. |
| I-6 | | | Völkischer Beobachter - German Nazi newspaper. |
| | Ludwig | Beck | Chief of the General Staff. |
| | Theo | | Kordt's brother. |
| | Colonel | Oster | Deputy head of military intelligence. |
| | Hans Bernd | Gisevius | Office of the Interior Ministry. |
| | Count | von Schulenburg | Office of the Interior Ministry. |
| | Hans | von Dohnányi | Office of the Justice Ministry. |
| | Friedrich | Heinz | The Abwehr man. |
| | | | Abwehr - German military intelligence service. |
| | Captain | Winter | Frau Winter's late husband. |
| II1 | Dorothy | | Prime Minister's daughter. |
| | Frank | | Prime Minister's son. |
| | Benito | Mussolini | Head of the Italian Government. |
| II-2 | Rudolf | Hess | Deputy Führer. |
| | General | Halder | Beck's successor as Chief of the General Staff. |
| | | Brauchitsch | Commander-in-Chief. |
| | | Sauer | Foreign Minister's staff. |
| | | | Sturmbannführer - Nazi Party rank equivalent to major. |
| | | Attolico | Italian Ambassador. |
| II-3 | | Margesson | British Conservative politician. |
| | Winston | Churchill | First Lord of the Admiralty. |
| | Queen | Mary | Mother of the King. |
| II-4 | | Goebbels | Reich Minister of Propaganda of Nazi Germany. |
| | | Bismarck | Conservative Prussian statesman, Germany. |
| | | | Duce - Italian leader, especially of the Fascist Party. |
| | Monsieur | François-Poncet | French Ambassador. |
| | Edouard | Daladier | French Prime Minister. |
| | Leyna | | Legat and Hartmann's friend. |
| II-5 | Colonel | Menzies | Joan's uncle. |
| III-1 | General | Keitel | Chief of the Wehrmacht Supreme Command |
| III-2 | William | Strang | Head of the Central Department. |
| | William | Malkin | Foreign Office's senior Legal Adviser, |
| | Frank Ashton | Gwatkin | Head of Economic Relations. |
| | Yvonne | | Syers's wife. |
| | Commander | Robinson | The pilot of Lockheed Electra. |
| III-3 | Heinrich | Himmler | Reichsführer-SS - highest rank of the SS. |
| | | Ciano | Italian Foreign Minister and Mussolini's son-in-law. |
| III-5 | Monsieur | Léger | Head of the French Foreign Ministry. |
| III-6 | Joseph | Horner | Prime Minister's doctor. |
| | Miss | Anderson | One of the Garden Room secretary. |
| III-7 | Hubert | Masarík | Cabinet Chief of the Foreign Minister of Czechoslovakia. |
| | Vojtek | Mastny | Czech Minister in Berlin. |
| | | | Der Stürmer - A weekly German tabloid-format newspaper. |
| III-8 | Baron | von Neurath | Foreign Minister, Germany. |
| | | Blomberg | One of the senior military commanders. |
| | | Fritsch | One of the senior military commanders. |
| III-10 | | Hoffmann | The Führer's personal photographer. |
| | Fräulein | Brown | Hoffmann's assistant. |
| IV-1 | Geli | Raubal | Adolf Hitler's half-niece. |
| | | | Die Rote Fahn - A German newspaper. |
