Undiscovered Mysteries

This book teaches you how to send secret messages to your friends or anyone you wish, messages that no one else can understand. You only need to practise a little with the book's cryptographic codes: from Julius Caesar's cipher to shift ciphers and the fun coding methods of the scouts. You can find out whether you have answered correctly thanks to your electronic pencil.

This book will test your intelligence and wits! Try your detective skills with fun logic, intelligence and observation games and become a real detective. You can find out whether you have answered correctly thanks to your electronic pencil.