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"I am looking for an older book in which a man travels to a secluded country house belonging to a noble family, as his doctor has recommended that he recuperate there. There he finds a mentally disabled son, a mother, and a daughter. The daughter is very beautiful and talented and is being mentored by the family’s priest. The mother and son have become degenerate and stupid due to incest within the noble family. The mother often sits for hours in the courtyard of the house during the day. He is always locked in his room at night and is not allowed to enter all the rooms. The residents of the nearby villages are afraid of the family."