I'm not familiar with *Nineteen Quiet Rooms* by Ottilie Marsh — I don't have reliable information about this book or its ending. It may have been published after my knowledge cutoff (April 2024), or it's something I just don't have details about.

Rather than risk giving you wrong information and making you look bad in book club, I'd suggest:

- **Checking Goodreads** — people often discuss endings in spoiler-tagged reviews
- **Skimming the last few chapters** quickly tonight
- **Searching for a plot summary** on sites like Wikipedia, BookBrowse, or Bookseer
- **Asking a friend** who has finished it

Sorry I can't be more help — but a made-up twist would be way worse than an honest "I don't know"!