I don’t have reliable information about *Nineteen Quiet Rooms* by Ottilie Marsh, and I’m not confident I can give you an accurate twist without risking a made-up answer (which would be worse for your book club).

A few quick options for tomorrow:

- **Skim the last 10–15%** now—most “twist” endings reveal themselves in the final chapter or two, even in a fast read.
- **Check the author’s/socials or Goodreads** for the last-chapter discussion; sometimes readers mark spoilers in reviews.
- **Ask your group early** with a line like “I’m still finishing—can someone remind me how it resolves?” so you can jump into discussion without faking it.

If you can paste a short summary or the last few pages’ vibe (not spoilers you’ve seen—just what you’ve read so far), I can help you reason through likely themes or what to watch for, but I won’t invent an ending.