The Exorcist: Believer follows Victor Fielding, a single father raising his daughter Angela. She and her friend, Katherine, disappear in the woods for three days with no memory of what happened; their parents are at a loss. Things get even worse as the girls begin acting out in strange and terrifying ways, and while Victor is hesitant to believe it, he begins to suspect that the girls may have brought something dark back with them. In an act of desperation, he goes to the only person who has experience with this, Chris MacNeil.

https://screenrant.com/the-exorcist-believer-david-gordon-green-jason-blum-interview/