I have to be straight with you: I don't have any information about a book called *Nineteen Quiet Rooms* by Ottilie Marsh. It may be a newer release, a lesser-known title, or something I simply don't have in my knowledge. I'd rather admit that than guess, because if I invented an ending and you repeated it at book club, that could get awkward fast.

Here's what I'd suggest instead, given the time crunch:

- **Search "[title] ending explained" or "[title] spoilers"** — book spoiler sites and blogs often summarize endings for exactly your situation
- **Goodreads reviews** — readers frequently discuss twists (usually behind spoiler tags), and sorting by most recent reviews can help
- **Reddit** — r/books or a search for the title might turn up discussion threads
- **Skim the last 3-4 chapters tonight** — even 20 minutes of speed-reading the ending will give you more accurate material than any summary

One more tip: if all else fails, being upfront at book club ("I didn't finish — no spoilers, but I'm dying to know how it ends!") often goes over better than bluffing. People love talking about endings to someone who hasn't read them yet.

Good luck tomorrow!