Kill or be killed is the new normal for Sawyer, Sara, and the survivors of the deadly virus that has all but annihilated the human race. With the death of Sara's father and the disappearance of the strange boy known as Mason, the teens are left reeling, but alongside the enigmatic ex-Marine, Edward, they soon forge an alliance with a collection of young survivors led by the sage and charismatic Kai. Nevertheless, when their new companions begin...