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| List of Maps | |
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| Prologue: Midway | |
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| "No Good, Not Even for Intelligence" | |
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| The end of the Black Chamber | |
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| William F. Friedman picks up the pieces | |
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| "I had the good sense to get out of it!" | |
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| Room 40 | |
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| Winston Churchill, an early convert | |
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| The Foreign Office, a late convert | |
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| The Soviet intercepts | |
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| A strategic failure for intelligence | |
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| Nature of the Beast | |
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| The birth of codebreaking | |
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| Machine ciphers, Poland, and the Enigma | |
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| Depth reading | |
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| The distinct limitations of thievery | |
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| Solving the Red machine | |
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| "Il y a du Nouveau" | |
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| 1939, a dark new year | |
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| Meeting at Pyry Forest | |
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| Marian Rejewski's mathematical feat | |
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| Recovering the daily Enigma keys | |
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| Alan Turing and other "men of the professor type" | |
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| Bletchley Park | |
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| The Poles' flight | |
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| Fighting Back | |
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| British mathematicians vs. the Enigma | |
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| The bombe takes shape | |
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| "A pile of dull, disjointed, and enigmatic scraps" | |
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| Cryptanalytic talent | |
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| Norway and Yellow | |
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| France and Red | |
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| HMS Glorious | |
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| Impossible Problems | |
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| The sinking of U-33 | |
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| Naval Enigma and the bombe | |
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| Operation Ruthless and other straws | |
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| American isolationism | |
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| Purple | |
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| The British charm offensive | |
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| A mission to Bletchley, bearing gifts | |
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| Success Breeds Success | |
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| The Blitz | |
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| Cape Matapan | |
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| Boniface, Barbarossa, and Bismarck | |
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| Naval Enigma, U-110, and the trawler pinches | |
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| The eastern front and German atrocities | |
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| Trafalgar Day | |
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| Cribs and continuity | |
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| The Machines | |
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| The British make polite noises | |
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| IBM machines and JN-25 | |
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| The machine attack on Floradora | |
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| Washington at war | |
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| Military vs. civilians | |
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| An American ultimatum | |
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| Better bombes | |
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| High-speed analyzers | |
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| Paranoia Is Our Profession | |
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| Donitz's suspicions | |
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| The evacuation of Corregidor | |
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| The Midway leak | |
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| Some bungled operations | |
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| "Do Not Talk at Meals" | |
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| Suspicions among friends | |
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| The Shadow War | |
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| Calling the shots in the Mediterranean | |
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| Torch and deception | |
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| The flight from Vichy | |
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| Atlantic convoys | |
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| U-559 and the breaking of Shark | |
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| The hunt for leaks | |
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| The American invasion | |
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| Pressures and diversions | |
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| Women in uniform | |
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| Command of the Ether | |
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| Russian espionage and Project Venona | |
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| GEE and Fish | |
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| Masters of deception | |
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| Yamamoto | |
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| The Water Transport code | |
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| Failure in the Ardennes | |
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| Signaling the end | |
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| Epilogue: Legacy | |
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| Appendixes | |
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| Chronology | |
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| Naval Enigma: Its Indicating System and the Method of "Banburismus" | |
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| Cryptanalysis of the Purple Machine | |
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| The Intercept Network | |
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| Rapid Analytical Machinery (RAM) | |
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| Notes | |
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| Glossary and Abbreviations | |
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| Bibliography | |
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| Acknowledgments | |
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| Index | |