Don, Connie, and their son Toby live on an isolated three hundred acre farm in a rural area of Maine. When the snow hits, they begin noticing large, strange tracks in the woods near their home. The animals begin behaving strangely. Mysterious lights appear unexpectedly outside the barn and house. When the snow reaches blizzard proportions, Don, Connie, and Toby find themselves cut-off from civilization. With no working telephone service, no available transportation, and no nearby neighbors, they are left to fend for themselves when the invasion begins.