This is one of the best in this series that I've seen so far.
In upstate New York a house is haunted by unseen visitors only seen by a mentally handicapped girl. Eventually, the girl's mother begins to believe that these spirits talking to her child are not angels, but demons.
The young mother meets and falls in love with a man who has studied paranormal events and senses when there are spirits around. He's uneasy the moment he steps into the house--but stays with the woman and her children as they attempt to get rid of what appears to be an evil spirit that is working through the girl who has no way of knowing good from bad.
The plot becomes chilling when we know that the demon called Frank is after the girl called Julie. A team of investigators are called in to determine if the occupants have indeed reason to be afraid of living there. It turns out they do--in a gripping scene where one of the investigators gets the scare of her life.
Good plotting, well acted and guaranteed to keep you in a state of high suspense. Chilling stuff, with some very convincing special effects.