Notes on a Scandal (2006)
A veteran high school teacher befriends a younger art teacher, who is having an affair with one of her 15-year-old students. However, her intentions with this new "friend" also go well beyond platonic friendship. adultery, infidelity, friendship, based on novel or book, obsession, blackmail, seduction, stalker, teacher, love, loneliness, conservative, relationship, art, extramarital affair, angry, antagonistic, audacious, condescending
ETC.
