The Untold Story by Genevieve Cogman, 384 pages
After years of tracking rogue Librarian Alberich, Irene has finally trapped him in a world from which he can't escape. Now she's able to focus on sorting out a peace treaty between the chaotic Fae and the strictly ordered Dragons — or that's what she thinks when she's ordered by the Senior Librarians to kill Alberich. But now he's offering to sign a truce, which certainly means that something strange is afoot. But can she believe him? Or is she better off just killing him and going back to her treaty work?
This is the eighth book in the Invisible Library series, and while Cogman says that it isn't really the end of the story for Irene and her allies, it's a fitting place to set down the story. This series started strong, wavered a bit in the middle (as much as it pains me to say it, the heist book was NOT necessary), and if this is the end, I'd happily say that it's a satisfying and strong ending. I can't wait to see what Cogman writes outside of this series!