If you loved The Exorcist III, try The Ninth Configuration
A bridge between a film you've already seen and one most people haven't. The Ninth Configuration has roughly 5.0× fewer votes than The Exorcist III — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by William Peter Blatty, and they sit in Horror / Mystery territory. If that's the register that drew you to The Exorcist III, the second film will land in a comparable space — through a different lens.
What The Ninth Configuration is
Moonlight through castle bars, the stone cold. A psychiatrist listens as madmen act out Christ’s passion, war games, a rabbit in the chapel. Blatty’s razor-sharp satire sees heaven in the asylum’s madness.

