Lisa Wax has to baby-sit for the Burtons, not knowing that the Burtons' eldest adopted daughter Patty has been locked up in the family basement most of her life for killing her adopted mother. Lisa starts having hallucinations and seeing visions of Patty as the Devil himself, trying to lure the little boy into the basement. Somehow Patty escapes and imprisons Lisa in the basement, without the parent's thinking any different.