"The author's upbeat, positive tone is refreshing and his enthusiasm about his topic is contagious." -- School Library Journal (starred review)
Pssst Do you know the difference between a code and a cipher? Can you tell a St. Cyr slide from a Cardano grille?...
History, trivia, and interesting code-breaking tales are compiled in a guide book to the world of secret writing, their deciphers, and the impact such correspondents have had throughout the years.