On a summer holiday with his family, Marlon Keys is about to hike the Appalachian Trail in the USA. He isn't exactly thrilled about the trip – he'd rather play on his smartphone and connect with his friends back home. But when Marlon accidentally gets separated from the group on the hike, his "boring" holiday becomes an exercise in survival. Can Marlon find his way back to his family and camp safely, or will he remain lost on the trail?