Pb, 48 full colour pages. great illustrations! Age 10+ Top secret messages from undercover agents, baffling ancient inscriptions and cryptic communications from sinister societies..... In this book, you will encounter a series of fiendishly difficult puzzles. They are all self-contained, so you can tackle them in any order. But if you start at the beginning, you will be able to follow the exploits of the five adventurers. If you can keep pace with their daring and dangerous investigations, you will be able to solve the book's central mystery and so locate a legendary hoard of long-lost treasures.