Ciphers
Featured — award winners and classics first, when available. Use “Show different books” for a new selection.
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The Mystery of the Marbles
The Bible code
One False Note
A King's Ransom (The 39 Clues
Storm Warning (The 39 Clues #9)
Codes and ciphers
Codes, ciphers & other cryptic & clandestine communication
Codes, Ciphers and Secret Writing
Will Solvit and the deadly gladiators
Ciphers and codes
Latest intelligence
Dead Time
Day of Doom
Breaking secret codes
The codebreakers
The Romeo and Juliet code
The 39 Clues
La Sonrisa De Mona Ratisa
Ruby Redfort look into my eyes (Ruby Redfort #1)
Depth charge
The Usborne book of secret codes
Big Nate Boredom Buster
Secret Codes
Into the Gauntlet
The Cat's elbow and other secret languages
Speaking secret codes
Margaret Moncrieffe; the first love of Aaron Burr
I spy
Addison Cooke and the Treasure of the Incas
