The Maiden's Tune（1973）

A traveler is drawn by a siren song to a foreboding castle. When a young boy warns him away from it, he is run over by a carriage carrying the enigmatic lady of the manor. She begs the traveler's assistance with the boy and takes him to her castle where she engages him in a supernatural, psycho-sexual pas de deux that leads him to the horrifying secret of the Maiden's Tune.