If you loved The Ninth Configuration, try Der Exorzist III
Eine Brücke zwischen einem Film, den du schon gesehen hast, und einem, den kaum jemand kennt. Das teilen sie, und was der zweite macht, was der erste nicht macht.
Was sie teilen
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 Ninth Configuration, the second film will land in a comparable space — through a different lens.
What Der Exorzist III is
Georgetown, autumn—cold rain on a crucifix carved from bone. A detective pieces together a killer copying blasphemies from twenty years past. The devil’s footnote hums in chiaroscuro.

