The Secret Agent Training Manual: How to Make and Break Top Secret Messages: A Companion to the Secret Agents Jack and Max Stalwart Series, Paperback

Inside are more than 80 pages of tips, tricks, and practice exercises for writing and deciphering cryptic communications. You'll learn how to make your own invisible ink, hide your messages, create unbreakable ciphers, and craft your own decoder gadgets. You can use this manual to learn how to exchange top secret notes with friends.

Expanded and republished