Unlock the world of secret communication with 'Codes, Ciphers, and Secret Writing.' Delve into the fascinating realm of cryptography, exploring ancient and modern codes used by spies and political leaders. Written by renowned science writer Martin Gardner, this book takes you from simple letter substitutions to complex polyalphabetical ciphers and unique methods like invisible writing with glow-in-the-dark ink. Solve historically famous ciphers, experiment with message sending techniques, and enjoy hours of intrigue and challenge. Perfect for young cryptanalysts, cipher enthusiasts, and puzzle lovers of all ages.