I don't have any information about *Nineteen Quiet Rooms* by Ottilie Marsh — it doesn't ring a bell as a book I know, so I'd risk making something up if I tried to describe the twist (which would be a disaster for book club tomorrow).

A few possibilities: it's a newer or very niche indie release that's beyond what I know, or the title/author might be slightly off. You could:

- Double-check the exact title and author spelling (sometimes these get garbled in recommendations)
- Look at the publisher's page or a spoiler-tagged review/Goodreads discussion for the ending
- Ask your book club group chat — someone may have finished it

If you tell me a bit about what you *did* read (genre, setting, main character), I can try to help you reason through possible directions the twist might go — or if it turns out to be a different, well-known book, I may know it. Otherwise, happy to help you come up with discussion questions for whatever you got through.