Looking for atmospheric English mystery novels (no detectives/investigators)

Hi! I’m looking for English mystery novels where the suspense builds gradually and naturally — but without detectives, police, journalists, or investigation as the main plot. I prefer stories where the mystery unfolds through atmosphere, characters, and slow tension rather than someone actively solving a case.

I’d love recommendations with:

Strong, memorable characters

A haunting or immersive setting

Slow-burn suspense

No traditional detective/investigator structure

Thanks in advance!