Have fun learning to be a secret agent! This bestselling Brainiac"s Secret Agent Activity Book will enable youngsters to solve word search mysteries, get lost in mazes, unscramble mixed-up words, learn Morse Code, fingerprint their friends, make code ring circles, and learn about real-life spies in history. Young secret agents can also use the invisible ink pen (included) to write magic messages!And they"ll find an ink pad for taking fingerprints.128 pages.Ages 8 and up.Concealed wire-o binding.Sturdy hardcover book.Hours of fun and educational, too!7-3/4 inches wide by 8-1/4 inches high.