The situation in the small provincial town seemed unusual to Peter Stewart. Under the guise of a writer, he came here with one goal - to lime Catherine More, who studies folklore and local cults. He suspects that the heiress of a large fortune, in whose house sessions with rituals and priests are held, is involved in the death of his brother. Having attended one of these meetings, Peter realizes that he is not the only one trying to drive the young learned lady to madness...