If you loved Longlegs, try The Blackcoat's Daughter
A bridge between a film you've already seen and one most people haven't. The Blackcoat's Daughter has roughly 3.3× fewer votes than Longlegs — 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 Osgood Perkins, and they both carry the dread mood tag, and they sit in Horror / Mystery territory. If that's the register that drew you to Longlegs, the second film will land in a comparable space — through a different lens.
What The Blackcoat's Daughter is
Upstate New York. Winter. Wind-chimes. Two Catholic schoolgirls remain behind during holiday break. One is plagued by nightmares, the other by a secret pilgrimage. Perkins delivers a glacial, gnomic riff on demonic possession.

