When an invisible attacker beats and rapes Carla Moran (Barbara Hershey), the mother of three seeks comfort from her friends and family, who dismiss her story as insane. But a psychiatrist (Ron Silver) and a team of paranormal experts come to believe Carla and devise a plan to trap the mysterious Entity. The thriller blends chilling horror with kinky exploitation, as exemplified in the scene in which Carla's breasts are fondled by unseen hands.