1:A Brief History of Cryptography from Caesar to Bletchley Park, Simon Singh
2:How It Began: Bletchley Park Goes to War, Michael Smith
3:The German Tunny Machine, Jack Copeland
4:Colossus, Codebreaking, and the Digital Age, Stephen Budiansky
5:Machine Against Machine, Jack Copeland
6:D-Day at Bletchley Park, Thomas H. Flowers
7:Intercept!, Jack Copeland
8:Colossus, Thomas H. Flowers
9:Colossus and the Rise of the Modern Computer, Jack Copeland
10:The PC-User's Guide to Colossus, Benjamin Wells
11:Of Men and Machines, Brian Randell
12:The Colossus Rebuild, Tony Sale
13:Mr Newman's Section, Jack Copeland, with Catherine Caughey, Dorothy Du Boisson, Eleanor Ireland, Ken Myers, and Norman Thurlow
14:Max Newman-Mathematician, Codebreaker and Computer Pioneer, William Newman
15:Living with Fish: Breaking Tunny in the Newmanry and the Testery, Peter Hilton
16:From Hut 8 to the Newmanry, Jack Good
17:Codebreaking and Colossus, Donald Michie
18:Major Tester's Section, Jerry Roberts
19:Setter and Breaker, Roy Jenkins
20:An ATS Girl in the Testery, Helen Currie
21:The Testery and the Breaking of Fish, Peter Edgerley
22:Dollis Hill at War, Jack Copeland, with David Bolam, Harry Fensom, Gil Hayward, and Norman Thurlow
23:The British Tunny Machine, Gil Hayward
24:How Colossus was Built and Operated-One of Its Engineers Reveals Its Secrets, Harry Fensom
25:Bletchley Park's Sturgeon-The Fish That Laid No Eggs, Frode Weierud
26:Geheimschreiber Traffic and Swedish Wartime Intelligence, Craig McKay
A1:Timeline: The Breaking of Tunny
A2:The Teleprinter Alphabet, Jack Copeland
A3:The Tunny Addition Square, Jack Copeland
A4:My Work at Bletchley Park, Bill Tutte
A5:The Tiltman Break, Friedrich Bauer
A6:Turingery, Jack Copeland
A7:Dc-Method, Max Newman
A8:Newman's Theorem, Friedrich Bauer
A9:Rectangling, Frank Carter
A10:The Motor Wheels and Limitations, Jack Good, Donald Michie, and Geoffrey Timms
A11:Motorless Tunny, Jack Good and Donald Michie
A12:Origin of the Fish Cypher Machines, Friedrich Bauer