The Devil Inside (2012)

On October 30, 1989, Maria Rossi committed a triple murder during an exorcism performed on her. The Catholic Church became involved, and she has since been in a Catholic psychiatric hospital in Rome. Her daughter, Isabella, learned of the murders from her father, who died three days after telling her.

Twenty years later, Isabella is in the process of filming a documentary with filmmaker Michael Schaefer about exorcisms and, to find out more about her mother, she visits Maria in Rome and meets two priests, Ben Rawlings and David Keane. Maria speaks in different accents and soils herself while screaming in an unidentified language. She has inverted crosses carved into her arms and her bottom lip and tells Isabella that killing a child is against God's will. Isabella had an abortion years ago and her mother had no way of knowing that—a sign that showed possible possession. David and Ben take her on an unsanctioned exorcism performed on Rosalita, a young woman. Rosalita calls Isabella by her name, despite not knowing her, and attacks the crew. Eventually, they get her under control.

During an exorcism on Maria, she mentions knowing what Ben did in the past and transfers demons to David and Isabella. The process is unsuccessful. The group presents evidence to the Church. Ben finds that there are four different demons speaking in unison. While performing an immersion baptism at church, David mutters lines from the Bible and starts forcefully submerging the baby in the holy water before passing out.

Soon after, Ben finds David at home with blood all over his forearms, much the way Maria was. The police arrive, and David acquires an officer's handgun. Ben tells him to fight it, but he begins to weep, reciting the Lord's Prayer, and forgets the last few words. He then shoots himself. Isabella begins having a seizure.

Ben and Michael take her to the hospital, where Isabella slashes a nurse's throat. Ben comes to the realization that Isabella is possessed. Ben and Michael leave with her in a car, heading to get help for an exorcism. Isabella tries to strangle Michael and breathes into his mouth. He instantly shows signs of possession, accelerating into oncoming traffic. The car collides, killing Ben and Michael in the process, while Isabella disappears from the wreckage.

A title card is shown informing that the case of the Rossi family is still unresolved and directing viewers to a website "for more information on the ongoing investigation".