The town of Silver Ridge, West Virginia, has disappeared from the face of the earth. To the outside world, a chasm of impenetrable mist is all that remains of the town. But inside Silver Ridge, the nightmare is just beginning.

Confined by this unimaginable barrier, the townspeople find themselves confronted by the denizens of a distant dimension: horrifying creatures that intend to transform the valley town into their own outpost. To these extra-dimensional travelers, human beings are nothing more than pests to be exterminated.

Russell Copeland and Debra Harrington are determined to resist the invaders... but as they face death to restore Silver Ridge to its rightful place on Earth, they find that their true enemy may not be the incomprehensible invaders, but an insidious evil whose origin is closer to home than they can imagine.