Teen-agers searching for a treasure hidden at an old farm find a secret message written in code.

"In 1953, a man was found dead from cyanide poisoning near the Philadelphia airport with a picture of a Nazi aircraft in his wallet. Taped to his abdomen was an

The Secret Code Book is a short introduction to substitution ciphers. The chapters ease young readers into the concept of rotation ciphers and work their way up

A collection of four all-new strange stories from the sleepy town of Gravity Falls in one original graphic novel. Written by Alex Hirsch. Illustrated by Asaf Ha

When properly understood, the human hand is an unsurpassed tool for character and emotional analysis. The Secret Code on Your Hands is a captivating instruction