Diabólica malicia AKA What the Peeper Saw 1972

n this stylish and atmospheric psychological thriller reminiscent of Henry James's Turn of the Screw, a widowed English writer brings a young, glamorous new bride to his bleak, isolated home in rural Spain. She soon becomes obsessed with her 12-year old stepson, who she learns has just been expelled from school for mysterious offenses; while the boy enjoys, exploits, and feeds her increasing paranoia about him.