Before Jake's grandfather died, he was on the trail of a centuries-old mystery. And he has entrusted that mystery to Jake, leaving behind a set of hidden codes, riddles, maps, and other clues that lead Jake and his friends on a scavenger hunt into the most wild and rugged wilderness of the national parks. The mystery unfolds as Jake, Amber, and Wes learn about survival skills, natural history, integrity, character, and friendship. Along the way, they discover they are not the only ones on this quest. An elusive shadow group is close on their heels. With over 100 illustrations in this collection, this page-turning adventure is designed to capture the imagination of even the most reluctant of young readers. Parents looking for a delightful read-aloud adventure will find it hard to put down. (Word of Caution: readers frequently note that this is a "Please read just one more chapter" experience). If your family loves the enchanted lands of our national parks, this series will take you to hidden places and into breathtaking landscapes. If you enjoy movies like and , or mystery adventures like the Hardy Boys and Gary Paulsen's survival story, , you'll love this third installment of the . Start this epic adventure on your Kindle app, or begin the journey with a paperback copy.