Barbara Hershey stars as Carla Moran, a hard-working single mother until the night she is raped in her bedroom by someone - or something - that she cannot see. Despite skeptical psychiatrists, she is repeatedly attacked in her car, in the bath, and in front of her children. Could this be a case of hysteria, a manifestation of childhood sexual trauma, or something even more horrific?
The movie begins as single mother Carla Moran (Barbara Hershey) is violently raped in her home by an invisible assailant. A subsequent episode of poltergeist activity causes her to flee with her children to the home of her friend Cindy (Margaret Blye).
They return to Carla’s home and the following day, Carla is nearly killed when her car mysteriously goes out of control in traffic. Urged by Cindy to see a psychiatrist, Carla meets with Dr. Sneiderman (Ron Silver) and tentatively agrees to undergo therapy. A subsequent attack in her bathroom leaves bite marks and bruises, which Carla shows to Dr. Sneiderman, who believes she has inflicted them on herself (despite the marks showing up in places impossible for her to reach). We learn that Carla suffered a variety of traumas in her childhood and adolescence, including sexual and physical abuse, teenage pregnancy and the violent death of her first husband. Dr. Sneiderman believes her apparent paranormal experiences are delusions resulting from her past psychological trauma.
Carla is attacked again, this time in front of her children. Her son tries to intervene but he is hit by electrical discharges and his wrist is broken. Dr. Sneiderman urges her to commit herself to a psychiatric hospital for observation, but she refuses.
After Cindy witnesses an attack, the two discuss possible supernatural causes. While visiting a local bookstore, Carla happens to meet two parapsychologists, whom she convinces to visit her home. Initially skeptical, they witness several paranormal events and agree to study the home. During their study, Dr. Sneiderman arrives and confronts Carla, trying to convince her that the manifestation is in her mind, but she dismisses him. Reassured that her case is being taken seriously, Carla begins to relax. Her boyfriend Jerry (Alex Rocco) visits and she suffers a particularly disturbing attack, which he witnesses. Hearing the commotion, Carla’s son enters the room and believes that Jerry is harming her, prompting him to attack Jerry. Later at the hospital, Jerry is so troubled by the experience that he ends their relationship…