Rebecca Yarros’ mysterious untitled Fourth Wing book has climbed to the top of the Amazon bestseller list before receiving a title or synopsis — an impressive feat. The new Empyrean release has been stirring excitement online since its pre-order page appeared on sites like Barnes & Noble and Amazon. Fans have been speculating on what it could be, with ideas ranging from a Book of Brennan companion to the secret project Yarros teased back in 2024.
At the end of the day, it doesn’t seem to matter what the book is, however — just that it will take us back to the world of Navarre. Readers are so excited by the prospect that they’ve been pre-ordering it without any more information. Because of this, it’s currently the #1 bestseller on Amazon.
Yarros took to Instagram to express her surprise at this milestone, and to thank readers for their continued commitment to her series:
“Okay, so I had this little idea about a year ago to drop a surprise for you guys. But then you not only found it as soon as my publisher put it on preorder, but shot it straight to number one on Amazon without a cover, title, or even a vague idea of what might be coming your way!?!?
You’ve rendered me speechless.
Surprise has been the goal, but I can’t sit here silently and not tell you how thankful I am for you. How utterly overwhelmed I am by the continuous love this community gives. Please know that I never take your enthusiasm and dedication for granted. I know how rare this air is. You are a constant source of joy not just in my life but each other’s, and gratitude doesn’t begin to describe how I feel about this community.“
She also noted that this will not impact the turnaround time for the next official Empyrean sequel, a relief for anyone still agonizing over Onyx Storm‘s ending. It does give fans of the series more to look forward to, though, and its fall 2026 release makes the publishing season even more exciting.
The Untitled Empyrean Book’s Big Milestone Highlights How Popular the Romantasy Series Really Is

The untitled Empyrean book’s big milestone may be surprising to Yarros, but it underscores how popular her romantasy series really is. Its fan base has only grown since the first book’s 2023 release, and it’s to the point where midnight release parties and themed sporting events are becoming norms. The mysterious new release climbing Amazon’s bestseller lists reveals why: readers feel that confident in Yarros’ storytelling.
Are you planning to pick up the untitled Fourth Wing book? Keep up with Backtalk Books for more news about the hit romantasy series!