After a nocturnal car accident on the English countryside, an unfortunate couple is invited to a mysterious manor occupied by a creepy embalmer who throws sexy drug parties there.
Production
That manor location is doing SO much heavy lifting.
Direction
Larraz lingers on discomfort like it's his love language.

Director
José Ramón Larraz
Trivia, insights & behind the scenes
Karl Lanchbury later became a regular in Larraz's films, essentially the director's creepy muse.
This is prime 'folk horror' before the term existed — the English countryside as hostile, ancient, and hungry.