•Why it earns a slot
Why it earns a slot: Hardy put "A Pure Woman" on the title page as a direct challenge to Victorian sexual morality, then spent 500 pages making good on that claim without softening the ending once.
A dairymaid descended from fallen nobility is ruined twice over, once by the man who wrongs her and once by the one who cannot forgive her for it.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.