i think that this film from jess franco be not a bad film . it be about a man call raymond bordier the editor of a newspaper and who use a castle of a count and countess to preform black mass that look and seem very real . vogal who be a former priest and and a religious fanatic happens to walk in on one of their black mass . he believe that he have saw the real thing and so he decide to exorcize the people take part . so that he can make them confess that they be under the influence of satan . to get their confession he torture them to death use medieval rite . i though this be quite a good film to watch although i do not find a lot happen in the film .