In the midst of societal collapse, Greg and Helen Taylor (Derek Luke, Erika Alexander) are faced with protecting their family from the anarchy of the outside world. As a last resort, the family takes shelter in a neighbour's bunker where their fate lies in the hands of the family patriarch (Sam Trammell), a survivalist, whose mercy lasts only as long as they prove themselves useful. Supplies are scarce, and when tensions rise, no one knows who can really be trusted.