A couple weeks ago, your boss ordered you to go on expedition to a house in the mountains. This house is far from any others, leaving an old radio to be your only source of communication to the lab where you work. Each night, you get a call from your sister, Acacia, who works with you at the lab. Then, the unthinkable happens. A zombie virus spreads through the lab without you knowing and you are left alone in the mountains surrounded by zombies without any hope.