Okay, here’s the friendly way I’d tackle this: first, make sure you and I are talking about the same 'Ember Queen'. There are a few
books with that title or similar ones, so the fastest route is to check the author name — the series order is always tied to the author. Once you know the author, look up the book on the publisher’s page, the author’s website, or a cataloging site like
Goodreads. Those places usually show the series order clearly and will list any prequel
novellas or short stories that come before 'Ember Queen'.
If you already have the physical book, peek at the front or back matter: many editions list the series and the reading order. Also watch for subtle clues on the cover (numbers, 'Book One/Two/Three') and in the copyright page (ISBN ranges and series notes). Sometimes publication order and in-world chronological order differ, so decide whether you want publication order or internal chronology — I generally
read in publication order, but I’ll switch to chronological for certain fantasy sagas. Personally, I love discovering a hidden prequel novella
after the main trilogy — it feels like a secret bonus. Good luck hunting, and I hope the series hooks you like it did me.