The Nuremburg war crimes tribunal has just ended. Major Richard Fortescue, previously part of the British prosecution team, is returning to London when he encounters Karin Eilers, a young German woman with a dark past. Against the backdrop of war-devastated Berlin and the continuing search for former Nazis, their brief affair and a mysterious black notebook make them unwitting pawns in a deadly game of intrigue and betrayal played by British and Soviet intelligence. What wartime secrets will the notebook unravel? Who else will become a victim of the battle for its possession?