>> he's out with a brand new book about his life and improbable adventure. >> reporter: somewhere out there there is a hidden 10 inch treasure chest. don't let its size fool you, it's full of gold coins. >> emeralds and diamonds. >> here's a man sending you on a thrilling chase. >> an after individual collector hid the treasure and wrote about it. >> my parents were dead and i don't know who's going to buy my book. >> 20,000 people from around the world. >> france, italy, spain. >> have surprised him for his book. he's inspired them to get off the couch and into the outdoors following clues em...