The book is based in fact (!), set at Paris's Salpetriere asylum in 1885. Some of the women who live there are truly mentally ill -- but many are simply "difficult" -- committed by husbands and families who are regard them as a problem, don't know what to do with them, and are anxious to be rid of them.
They are hidden away and mostly forgotten by respectable society, with two exceptions: the regular lectures by Dr. Charcot (a real-life figure), who performs public demonstrations of hypnotism on the patients in front of enthralled (male) audiences -- and the annual Lenten Mad Women's Ball, when the patients are allowed to dress up in costumes and mingle with the citizens of Paris, who have been invited to come gawk at them.
The main story focuses on two women at the Salpetriere: matron Genevieve, who has shunned religion in favour of science and thrown herself into her work since the death of her beloved younger sister; and rebellious teenager Eugenie, whose family committed her when she told her grandmother that she can see the spirits of dead people. She's determined to escape and find other people who believe as she does (she knows they exist; she visited a spiritualist bookstore) -- but how?
This was a relatively short, quick read, with a story that builds steadily to the climactic event: the Mad Women's Ball. While it's not a book I would have likely picked up on my own, it was interesting (especially since Salpetriere was a real place, and the plot is loosely based on a true story!), and I enjoyed the characters (some of the secondary ones in particular -- young, naive, abused Louise; Therese, the former prostitute, who knits shawls for the other patients; and Eugenie's brother Theophile, who can't shake the guilt he feels for his role in having his sister committed). Still, I felt a certain emotional distance from it all. I'm wondering if the fact that it was translated from the French had something to do with that?
The book was made into a well-received French movie (available for streaming on Amazon Prime), which had its premiere at the 2021 Toronto International Film Festival (TIFF) -- written, directed by and starring Melanie Laurent as Genevieve. I haven't seen it myself, but I suspect it might make a good movie, perhaps (for once!) even better than the book!
3.5 stars on StoryGraph, rounded down to 3 on Goodreads (after some internal debate).
This was Book #4 read to date in 2025 (and Book #1 finished in February), bringing me to 9% of my 2025 Goodreads Reading Challenge goal of 45 books. I am (for the moment, anyway...!) on track to meet my goal. :) You can find reviews of all my books read to date in 2025 tagged as "2025 books."