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