Dr. Alan Harker rides to the crumbling castle of his former university professor, Dr. Eric Usher, to find the old man caught in the grip of paranoia, his mind eroded by his ongoing attempts to resurrect his comatose daughter Melissa with the blood of abducted women. As he nears inevitable death, Usher enters a twilight world that exists between life and death, where he is met by some unsavoury souls.