Unseelie Brothers, Ltd.
Novelette 8,628 words Recommended by 8 award/anthology sources
"A week before the Season began, as Mrs. Vanessa Saunders held brunch court at the Empire Hotel, a photo appeared on her phone: a large oak door beneath a pale green sign with silver lettering. Impossible, she thought, flipping the infernal device over before Mrs. Lillian Talbott and Mrs. Caroline Rankenfall, her Fête Noire Charity Ball co-chairs, could glimpse it."
Content warnings 1
death
Quasar links out; the story lives on Uncanny, where the author gets the click.