Sixteen-year-old Anne Burden lives completely alone. A nuclear war took all her loved ones. The world as she knew it no longer exists. For a whole year, she lives in a sealed valley and considers herself the only person on Earth. But one day she sees a column of smoke rising in the distance. Someone survived and is making his way to her valley. Who is this person? What does he want? Can she trust him? Soon Anne realizes that there are things far more terrifying than being the last person on the planet…