When lovely and virtuous governess Henriette Deluzy comes to educate the children of the debonair Duc de Praslin, a royal subject to King Louis-Philippe and the husband of the volatile and obsessive Duchesse de Praslin, she instantly incurs the wrath of her mistress, who is insanely jealous of anyone who comes near her estranged husband. Though she saves the duchess's little son from a near-death illness and warms herself to all the children, she is nevertheless dismissed by the vengeful duchess. Meanwhile, the attraction between the duke and Henriette continues to grow, eventually leading to tragedy.
Plot keywords (from IMDb): 19th century, domestic triangle, duke, dysfunctional marriage, extramarital affair, false accusation, girls' school, governess, husband wife relationship, hysteria, jealous wife, jealousy, melancholy, murder, nobleman, paris france, scandal, schoolteacher, suicide, teaching, unrequited love, children
All This, and Heaven Too (1940) 