Horror erupts when newlyweds, Karen and Jeremy, cross paths with members of a diabolical cult inside a West Virginia cave. Living below the earth’s surface has triggered mutations, rendering the cult members nearly infertile. Their leader, a wild-eyed, cunning brute, refuses to let the couple leave, believing they and their potential offspring hold the key to surviving underground. Are Karen and Jeremy doomed to spend their lives inside this sunless, subterranean wasteland, or do they escape before their minds shatter and their bodies betray them?