Caché (2005) on Netflix

Guilt. Anne and Georges Laurant have a book-lined Paris townhouse, jobs at a publishing house and as the host of a high-brow talk show, and a teenage son, Pierrot, who's on the swim team. Their dinner parties sparkle, but there's tension. They have little to say to each other: Anne may be on the verge of an affair with a close family friend, and Pierrot is monosyllabic and out with friends some evenings. There's new strain when they begin to receive tapes of their home under surveillance--tapes accompanied by childlike drawings of a boy and blood. Anne and Georges are unnerved, dreams give Georges a clue, but he shares little with Anne. What part of himself and his past has he kept hidden?