Or that way back when there were no phones, birds were used to carry important messages?
From THE BIG BOOK OF SPY STUFF by BART KING, you are going to learn how to write in codes, how to tie your shoelaces in codes and also how to break codes...
Additionally, the book has tons of information on spies, secret agents and such.
For example, did you know of the confusion agents? They are spies who do not spy. Instead, they spread misinformation to confuse enemy agents.
For grades 5th and up.
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