He tells them to pass it up the chain till someone does. That person is Special Agent Kimberley Reynolds. Arriving in snowbound Northern Wisconsin, she finds that a tornado has flattened half the town - and there's no sign of Henderson.

Things soon go from weird to worse, as neighbours report unsettling sightings, key evidence goes missing, and the snow keeps rising - cutting off the town, with no way in or out... As the clues lead to the coldest of cold cases - a cursed expedition into the frozen wilderness - Reynolds follows a trail from the start of the American nightmare, to the horror that still lives on today.