Mystery in Rocky Mountain National Park: Before Jake's grandfather died, he was on the trail of a centuries-old mystery which he has entrusted 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 heart of Colorado's wild and rugged Rocky Mountain National Park. Discovery in Great Sand Dunes National Park: Jake, Amber, and Wes travel to the Great Sand Dunes in southern Colorado, where they stumble upon an unexpected mystery that leads to a dangerous quest, teaching them important lessons about survival skills, natural history, integrity, character, and friendship. Adventure in Grand Canyon National Park: Jake, Amber, and Wes encounter new dangers and find their friendship tested as they follow the clues Jake's grandfather hid away in an old scrapbook. The stakes are higher, and the history goes deeper as the three kids put their heads together to solve a puzzle that is perhaps hundreds of years in the making.