The Taking of Deborah Logan (2014)

Students, Mia Hu, Gavin, and Luis start a project documenting Deborah Logan, an elderly woman with Alzheimer's disease, living with her daughter, Sarah. As they record her daily life, Deborah starts to exhibit increasingly bizarre actions, which her personal physician states are normal for someone with an aggressive form of Alzheimer's. However, cameraman, Luis, notices that her actions defy ordinary explanations, and expresses concern that something supernatural is at work.

Things grow more tense after Luis and Gavin record Deborah speaking in French about sacrifices, and snakes. They notice that the line for 337 at her switchboard continually rings; the line belonged to local physician Henri Desjardins, who disappeared after a series of cannibalistic ritualized murders of four young girls. Deborah's behavior becomes so extreme that she is hospitalized for her own safety. Dismayed, Gavin quits the film.

The others discover that Desjardins was supposedly recreating an ancient Monacan ritual to make himself immortal. The ritual required the deaths of five girls who had recently had their first period. They suspect Deborah is possessed by Desjardins. Sarah, Mia, and Luis discover that Deborah had unsuccessfully tried to abduct Cara Minetti, a young cancer patient. At the hospital, Harris Sredl, Deborah's friend, visits her, and she begs him to kill her. He tries to comply, but is knocked out by the entity possessing her.

Harris reveals to Sarah that years ago, Deborah found out that Desjardins planned to use Sarah as his fifth victim. To protect Sarah, Deborah murdered Desjardins and buried his body in the yard. The group finds the body's remains and tries to burn them, but fails when Desjardins' spirit intervenes.

Deborah escapes her restraints, abducts Cara and takes her to the abandoned mine where the previous victims were killed. Sheriff Linda Tweed pursues her, only to be killed. When Sarah and Mia find Deborah, she is trying to swallow Cara's head in a snake-like manner. They manage to burn Desjardins' corpse, and Deborah becomes herself again, the possession apparently having ceased.

Some time later, news footage shows that Deborah was deemed unfit to stand trial for her crimes, her health having deteriorated rapidly following the incident. Cara, now cancer-free, celebrates her 10th birthday. As the reporter wraps up the story, Cara smiles sinisterly, implying she is now possessed by Desjardins, who has completed the ritual.