Humanity's time is done. A modern ice age has all but stamped out human civilization and left the Earth nearly uninhabitable. For Ira Hartman and the dysfunctional band of survivors that surround her, all that's left of the old world are ghosts trapped beneath the still forming ice sheets. Living in retrofitted tunnels beneath Riverside, California, scrounging for food, supplies, and desperately trying not to kill each other, things could be worse; but when an accident causes the generators powering their shelter's heating system to be destroyed, hope seems to have run out.That is until Ira discovers a strange heat signature in the San Bernardino mountains, and it leads to a secret military research facility housed deep within the mountain. At first, it seems like the perfect shelter. Plenty of rations. Water. Warmth. Then they discover the remnants of horrifying experiments. Corpses, strapped to operating tables, horror etched on decomposing faces, experiment rooms filled with strange machines and occult symbols, and the logs of a raving lunatic. The unmistakable feeling that something is watching them, waiting in the cold, tubular concrete tunnels, in the shadows.What Ira and the others don't know might just kill them.