The Spy's Guide to Secret Codes and Ciphers
By Jim Wiese.
Description
Spy University presents a fun way for young spies to learn all about secret codes and ciphers. Features: Loads of Codes; Spy Quest: The Case of the Writing on the Chalkboard; and 12 Spy Missions. - from Amzon
ISBN(s)
0439336406, 9780439336406
