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Alvin's Secret Code
By Clifford B. Hicks
Alvin's "sixth senses" is about to catapult two seventh grade secret-agents-turned-cryptographers (plus Alvin's younger sister Daphne, "the Pest") into the intricacies of authentic code detection and the dangers of a newly stirred-up 100-year-old mystery. Includes Alvin's own notes on cryptography in an appendix at the back. 160pp pb
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