Sidney J. Furie directs this supernatural American horror. Young, single mother Carla Moran (Barbara Hershey) is continuously attacked and raped by a demonic invisible entity but no one believes her claims. After she flees to her friend Cindy (Margaret Blye)'s, Carla is referred to a psychiatrist who thinks it's all in her mind, but two parapsychologists manage to isolate the creature after being invited to her home and staging a trap for the entity. Will they be able to end the attacks for good?