John Hall is a drifter who wanders into a small town in Maine. He needs a job and decides to seek employment at the community's top business: a large textile mill. He is hired to work the "graveyard shift" -- from around midnight to dawn -- and, along with a few others, he is charged with cleaning out the basement. This task strikes the workers as simple enough, but then, as they proceed deeper underground, they encounter an unspeakable monstrosity intent on devouring them all.
A top surgeon is besotted with a beautiful woman who once rebuffed him. Unable to come to terms with life without her, he tries to convince her that they need each other. She has other ideas, but a horrific accident leaves her at his mercy.
Dan Merrick comes out from a shattering car accident with amnesia. He finds that he is married to Judith who is trying to help him start his life again. He keeps getting flashbacks about events and places that he can't remember. He meets pet shop owner and part time private detective Gus Klein who has supposedly done some work for him prior to the accident. Klein helps Merrick to find out more...
