Mystery Files tries to unlock the secrets behind some of the most incredible stories in history-from lost ancient cities and vanishing ships to unbelievable scientific phenomena. What if you wanted to send a message that only a few people could understand? That is when you would use secret signs. Find out what we know about codes and ciphers used by ancient armies, the rituals of secret organizations, mysterious designs etched into the ground, and statues whose purpose are no longer known. Book jacket.
Crabtree Publishing Company