Bobby and Addie Wilcott have a strained marriage that they hope will improve when they buy an historic house in New England. Their marriage is further tested when doors refuse to stay closed and the piano repeatedly plays by itself. The couple tries their best to ignore the strange occurrences until their 5-year-old son is attacked by an unseen entity.
Paranormal experts Ed and Lorraine Warren, famous for their work on the real-life Amityville horror house, discover that the couple has a much bigger problem – a demonic presence that is feeding on the discord in Bobby and Addie’s relationship. Their only hope is an exorcism.