The authors 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 Did you know that the discovery of a substitution cipher caused Mary Queen of Scots to lose her head Dont look now but packed into this practical field guide is everything a young person needs to know about the art of concealment making and breaking codes mastering cipher systems and experimenting with secret writing. Offering plenty of handson practice sessions tips for creating a codemaking kit sidebars on secret codes in history and an amusing pair of spies to illustrate techniques Paul B. Janeczkos tantalizing Top Secret wont stay a secret for long. Back matter includes suggestions for further reading an authors note an answer key and an index. show more