Two sisters run a small hotel in Spain and they kill the women who do not live up to their view of morality. Later they make food of the bodies and serve it to their guests.
A young woman searching for her sister suspect something was amiss and begins to investigate. It does not sound too bad, but this was not good, at least not in the version I saw, called It happened at Nightmare inn, that lacks 16 minutes of nudity, murder, and other funny things.
A good scene is when a head pops up in a giant jug of wine, see the poster. A bit scary actually.