PAUL and JENNIFER HEMDALE have just moved into their dream house. But their hay marriage is about to be ut to the test as they slowly discover the secret behind the black room in the cellar. Something else is already living in their new home and it is growing er every day. It has claimed many victims including the last owners of the house. Reairmen who journey down into the basement soon meet a horrible end. When Paul is taken over by this demonic entity, it is no longer traed within the walls and is quick to take advantage of all leasures of the flesh. Jennifer and her younger sister KAREN begin to susect that something is wrong with Paul. Karen finds out the truth a hard and ainful way, leaving Jennifer alone to fight the demonic entity that has ossessed her husband and threatens to destroy her very soul. And Paul is not the only one transforming as Jennifer soon discovers that the black room is not only evil but alive as well and may not be able to be stoed!