It is 2175, six years after the global conflict, the destruction of technology, and the collapse of every major civilization around the globe. Mass transportation, instant communication, internet connectivity, television, cell phones, - all gone. Dr. Noah Baxtor is called to hike seven hundred and twenty-five miles through the dangerous wilderness to deliver vials of life-saving vaccine to the Blue Springs Mountain Outpost before Prion-4 unleashes its wrath and thousands more die. His prayer is to survive the challenging journey and save untold lives.