Poor, plain spinster Bette is compelled to survive on the condescending patronage of her socially superior relatives in Paris: her beautiful, saintly cousin Adeline, the philandering Baron Hulot and their daughter Hortense. Already deeply resentful of their wealth, when Bette learns that the man she is in love with plans to marry Hortense, she becomes consumed by the desire to exact her revenge and dedicates herself to the destruction of the Hulot family, plotting their ruin with patient, silent malice.