The woman here is Sylvia Russell: power mad with set goals. In order to achieve those goals she is sadistically devoted to her son and daughter, able to possess and direct them. She subtly ruins her daughter's marriage by corrupting a servant girl and, then, uses her to compromise her son-in-law; slowly breaks her bumbling, unambitious husband's confidence...
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Letter from an Unknown Woman is a 1948 American romantic melodrama film released by Universal-International and directed by Max Ophüls. It was based on the 1922 novella of the same name by Stefan Zweig. The film stars Joan Fontaine, Louis Jourdan, Mady Christians, and Marcel Journet (actor).