An old man, Zack, feels that he is no longer needed and sets out on a one way journey, until his trip is interrupted and he saves a young girl, Molly, becoming an unexpected hero. The two develop a Grandfather and Granddaughter relationship as they travel across the United States following the Lewis and Clark Trail. Zack, a retired teacher, takes every chance he can get to teach Molly about the Lewis and Clark expedition. He focuses mainly on Sacagawea and her blue beads. Eventually these blue beads take on a special meaning to Molly and Zack. Along the way they meet new friends, come across dangerous predators both human and animal, experience tragedy, and learn more historical facts than they ever anticipated. All the while, Molly is starting to change for the better thanks to Zack's guidance and she experiences her first love and the heartbreak that goes with it. Meanwhile, a dark and mysterious figure looms over them. Can they escape this unseen foe? Can they enjoy this adventure forever or will it come to an end? Should she go back to school or stay forever with her new found Grandfather? What was the meaning behind their friend's tragic vision of their future? Can they stay with the Hopi forever?