This has nothing to do with the reality of the so called devils of Loudun and the case of the local vicar Urbain Grandier and his conflict with Cardinal Richelieu, eventually leading to his burning at the stake. This is an entirely Polish paraphrase on the phenomenon set somewhere in the wilderness in an apocalyptic landscape of desolation with no trees, no music except monastic monodies, sterile surroundings and a bleak environment, like changing the whole situation into some dark medieval times. Instead, this is a thoroughly stylistic film using the obsession of the nuns for ballet-like performances of striking cinematography and efficient beauty, while there is no actual story here. A young priest comes to the convent of the nuns to do something about their obsessions, which he ultimately fails in, as he himself becomes infatuated with the beautiful abbess mother Joan, who dominates the entire film. A previous priest has been burnt at the stake for being alleged to have seduced the nuns and caused their obsession, here is the one parallel to the case of Urbain Grandier, but all the rest is Polish conjecture. The film is worth seeing for its stylistic treats, but there has never been made any correct or convincing film of what really happened at Loudun. The only one who has tried to investigate the case thoroughly, as far as I know, was Aldous Huxley.