The devastating horror of a nuclear apocalypse is now reality and nine desperate strangers find themselves clinging to life in a farmhouse cellar, while radioactive fallout descends on the darkened world above. These would-be survivors face the nightmare of dwindling supplies, poisonous air and the greatest threat of all — the hordes of zombie-like refugees who want in. With each dying day, their choice becomes clearer — stay and let the makeshift shelter become their tomb or face the unknown terrors of the world outside.