Tracking down a missing person private detective, Richard Mason finds himself trapped in a decrepit old manor, looking after the thing that lives in the cellar below the house; a horrific vampire which forces him through psychic torment to seek out new victims for it to feed on.

Mason obeys but slowly finds he has to fight every day; Against the noises of the bodies that won’t stay dead below the stairs, the horrific imagery the vampire puts into his head in order to break his will and from the fact that he is in a nightmare he might not be able to escape from.

As he begins to realize his life as the creatures familiar will not last long, Mason comes to the conclusion...

...he protected it, he cared for it and tonight… he will kill it.