In a world that has become dark and cold, Clay Stratford finds himself the unlikely leader of a motley band of survivors as they struggle to scratch out an existence amongst the hostile aftermath left behind by the eruption of the Yellowstone Caldera. With no electricity, no government, and no help, they push themselves through the hardships of life without modern comforts. Battling the extreme new elements, they find themselves fighting against feral animals, roaming cannibals, and their own sanity, doing their best to adapt to life in the newly formed and sunless world as they search for food, water, and safety.