Plot of The Haunting in Connecticut

Set in 1987, the story centers on Matthew Campbell, who is being treated for Hodgkins Lymphoma in a hospital in Upstate Connecticut[1]. After seeing the effect the long commute has on Matt, his family rents a nearby house, which they learn was previously a funeral home. They discover a mortuary room in the basement and the family begins experiencing violent and supernatural events that the parents initially blame on stress and hallucinations from Matt's treatment. Matt also experiences visions from the perspective of a young man named Jonah. Matt contacts a minister he met at the hospital for assistance with his paranormal experiences. The minister informs Matt that the visions and supernatural encounters are likely a result of the previous occupant's occult activities (including séances and necromancy). The Jonah character is discovered to be the ghost of a psychic medium involved in the previous owner's activities and presently bound to control the "spirits" within the house.
The film comes to its climax when Matt learns the source of the haunting and tries to rid the house of the undesired spirits.
source : wikipedia