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List of Illustrations. Acknowledgements. Introduction. Prologue. The Betrayal - Belgium and Germany, 1931. The Leak - Poland, Belgium and Germany, 1929-38. An Inspired Guess - Poland, 1932. A Terrible Mistake - Poland, 1933-9. Flight - Germany, Poland and England, 1939-40. The First Capture - Scotland, 1940. Mission Impossible - Norway and Bletchley Park, 1940. Keeping the Enigma Secret - France and Bletchley Park, May-September 1940. Deadlock - Bletchley Park, August-October, 1940. The Italian Affair - Bletchley Park and the Mediterranean, March 1941. The End of the Beginning - Norway, March 1941. Breakthrough - North of Iceland, May 1941. Operation Primrose - The Atlantic, May 1941. The Knock-Out Blow - North of Iceland, June 1941. Suspicion - Bletchley Park, the Atlantic and Berlin, May-October 1941. A Two-Edged Sword - The Atlantic and the Cape Verde Islands, September 1941. Living Dangerously - The South Atlantic and Norway, November 1941-March 1942. The Hunt for the Bigram Tables - Bletchley Park and Norway, December 1941. Black Out - The Barents Sea, Bletchley Park and the Admiralty, February-July 1942. Breaking the Deadlock - The Mediterranean and Bletchley Park, October-December 1942. The Turning Point - South of France, the Mediterranean and the Atlantic, November 1942-September 1943. Trapped - South of France, November 1942-March 1943. The Arrest - Berlin, March-September 1943. Sinking the Scharnhorst - The Barents Sea, December 1943. Operation Covered - Paris, the Indian Ocean and the Atlantic, August 1943-March 1944. The Last Hiccough - Germany, France and the South Atlantic, March-June 1944. Epilogue - Where did they Go? Chronology. Glossary. Appendix 1: Polish Codebreaking Techniques. Appendix 2: The Bombe. Appendix 3: Naval Enigma. Appendix 4: Cillis. Appendix 5: Rodding. Appendix 6: Naval Enigma Offizier. Notes. Bibliography. Index.