Have fun learning to be a secret agent! Brainiac's Secret Agent Activity Book will enable kids to send secret messages with code rings, solve mysteries, get lost in mazes, fingerprint their friends, and learn about real-life spies of the past. Young secret agents can also use the invisible ink pen (included) to write magic messages! An ink pad for taking fingerprints is also included! Hours of fun and educational, too. Ages 8 and up. Full color throughout. Sturdy wire-o hardcover binding. Activity book measures 7-3/4'' wide x 6-1/4'' high. 128 pages.