John Hall is a drifter who wanders into a little town in Maine. He makes the decision to seek out employment at the community business: a large fabric mill and needs a job. He is hired to work the"graveyard shift" -- from around midnight to sunrise -- and, along with a few others, he's charged with cleaning the basement. While they move underground , they encounter an unspeakable monstrosity intent on hammering them , although on the workers strike as simple enough.