When a late night storm drives a young couple to take refuge in an old abandoned mansion, it isn't long before they discover that they've entered the lair of 999 haunts who are in no way happy to see them. In the madness that follows, Tom and Carol are separated and on their own; and as they feverishly seek for one another among the endless halls and countless rooms they must also avoid getting caught by the denizens of this dark abode - half of which are dying to have them for dinner and the other half seek to banish them to the Netherworld forever and take dominion of our physical world....