1. Introduction -- 2. Beginnings - Herbert Yardley -- 3. Beginnings - William Friedman and Elizebeth Smith -- 4. The Great War - Meetings -- 5. Wars End -- 6. What Might Have Been -- 7. The Cipher Bureau: Early Days -- 8. The Lone Cryptologists: Escape from Riverbank -- 9. The Cipher Bureau: Success and Decline -- 10. The Lone Cryptologists: Washington Life -- 11. Cryptologic Endings and Beginnings -- 12. The American Black Chamber -- 13. A Pretty Young Woman in a Pink Dress -- 14. One Career After Another -- 15. Red and Purple -- 16. Yardley Abroad -- 17. The Friedmans at War - William -- 18. The Friedmans at War - Elizebeth -- 19. Yardley's War -- 20. Endings -- 21. Memories of Friedman and Yardley -- Appendix - A Few Words of Cryptology -- Bibliography -- Photo and Illustration Credits.