1. The betrayal -- 2. The leak -- 3. An inspired guess -- 4. A terrible mistake -- 5. Flight -- 6. The first capture -- 7. Mission impossible -- 8. Keeping the Enigma secret -- 9. Deadlock -- 10. The Italian affair -- 11. The end of the beginning --
12. Breakthrough -- 13. Operation Primrose -- 14. The knock-out blow -- 15. Suspicion -- 16. A two-edged sword -- 17. Living dangerously -- 18. The hunt for the bigram tables -- 19. Black-out -- 20. Breaking the deadlock -- 21. The turning point -- 22. Trapped -- 23. The arrest -- 24. Sinking the Scharnhorst -- 25. Operation covered -- 26. The last hiccough -- Epilogue: where did they go? -- App. 1. Polish code-breaking techniques -- App. 2. The bombe -- App. 3. Naval Enigma -- App. 4. Cillis -- App. 5. Rodding -- App. 6. Naval Enigma Offizier - how it was broken.
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