When Susan Walker is ten years old, she has a nervous breakdown in the cemetery after the funeral of her mother. She leaves her Aunt Cora Nomed and runs to the Nomed Family's Mausoleum. She unleashes and is possessed by a demon, since there is a curse on the first born woman of her family.
Twenty years later, Susan Walker Farrell is happily married with her husband Oliver Farrell, but is still under treatment by psychologist Dr. Simon Andrews. When she changes her behavior, her Aunt Cora explains the family curse and gives the journal of her ancestor to Dr. Andrews, but he does not pay much attention, believing it is superstition.
Meanwhile, the demon is getting stronger and begins a crime spree, killing the persons around Susan.