•Why it earns a slot
Why it earns a slot: Boule de Suif, the story that opens all six volumes, is Maupassant's clearest indictment of bourgeois hypocrisy: the same passengers who beg her to sacrifice herself for their safety cannot bring themselves to share a boiled egg with her afterward.
The complete Maupassant story cycle opens with a prostitute saving a coach full of respectable French citizens from the Prussians, and closes with those same citizens eating in front of her while she starves and weeps.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.