The belief in possession by evil spirits plagued the darkness of the 18th century. Madness and hysteria spread, classifying the cripples and mentally ill as "Being under the control of the Devil". These misfits became the victims of bizarre exorcisms or " Casting Out Rituals". Banished and removed from society they were locked away inside brutal asylums. Left helpless, alone and afraid they were branded "The Possessed".

The day Karen and Ed Parker move into their dream home, ominous clues of its chilling funeral parlor past greet them: crucifixes on doors, toe tags and coffin keys in the basement. Their 14-year-old son, Paul, claims he sees apparitions and hears voices. Soon, the house is plagued by dark forces that torment the entire family, and it will take a desperate call to Edward and Lorraine Warren-investigators of the Amityville haunting-to offer any hope of relief.