Jessica, a lonely
pre-teen girl, finds a blind, almost hairless kitten that she names Worm. A reclusive elderly neighbor, Mrs. Fortune, helps her to wean and raise him. Worm seems to have a terrible hold on Jessica, compelling her to do cruel and destructive things to people in her life who have upset her. Jessica's victims include her former best friend, Brandon, and her childish and emotionally distant divorced mother. As Jessica's destructive actions escalate, her mother attempts to send her to counseling, which further enrages and upsets her. Jessica comes to believe that Worm is possessed by a group of witches, which includes Mrs. Fortune. When Jessica finds herself contemplating Mrs. Fortune's murder, she realizes she is in danger of going too far, and decides to
exorcise Worm herself to break his hold over her. After a dramatic exorcism, culminating in a nighttime chase during a bad thunderstorm, Worm becomes a normal cat, and Jessica is reconciled with her mother and Brandon, causing her to think that she not only exorcised Worm but also herself. ==Reception==