When a viral incident which raises the recently dead into undead creatures that crave human flesh infects a majority of the human population, Sam, in his quest to ensure the survival of his friends and family, must fight his way through several miles of infested territory. The journey is long, difficult and virtually impossible, but he undertakes it all the same. His unbreakable will and love for those he cares about drives him to fight his way through an extremely hostile landscape, with the hope that they will still be alive when he gets there.