They were safe in the Library, and the Library would endure.
The Burning Page was a return to form with this series, and had everything that I didn't like about The Masked City, mainly that there was more of the actual Library.
The Library is a place outside of time, it is neutral, and is home to millions of different books stolen across thousands of different worlds. What I love about this idea is that the possibilities are endless in terms of story, but more than that, it is the idea that books are something to be cherished, to be fought over, and are just as important than the lives of those who inhabit those worlds. Irene is a dedicated Librarian, despite her recent indiscretions, and she wants to try and make up for her past mistakes. Rescuing her apprentice, Kai, who also happens to be dragon royalty, from a high chaos world cost her a lot in the eyes of the Library, but also for the people who tried to help her. Now Irene feels responsible for what has befallen her small group of friends, but there is a new danger arising from the traitor Alberich and it is direct threat to everything that Irene holds dear.
I felt that the storyline was superior in this addition to the series. There was more on the line, not just for the Library, but for Irene, as she decides what matters to her and what she may be willing to sacrifice. There were multiple trips to the Library itself, and we met some new Librarians, which could have wider implications for the story later. Irene's use of the Language (which is basically her ability to alter people and objects around her) wasn't overused either, or if she did rely on it, it seemed that there were no other options so it wasn't a quick out. And I really do love Irene, she is so prim and proper at times, but then gives into her feelings in moments that show her true personality.
Irene had never particularly liked fire. More than that, the idea of fire getting loose among her books was a particular nightmare.
All that being said, I was a bit disappointed by the ending in that Irene just seemed to cure Vale of his chaos infection(?) rather simply. Since it was a major subplot in the novel, I expected something a little bit more.....creative in how to deal with it. Something else I will mention is the continuation of some elements of past books. For example, at the end of the first book (which I read in 2014 when it was initially released) Irene comes into possessions of a rare book of Grimm's fairytales that has a entirely new story, which is what Alberich wants, but I couldn't entirely remember what it was about and why it was so important. This is why a little bit of an overview would have been good, to refresh my memory if anything else, just to remember what is on the line.
There were some new questions raised at the end of the book which would completely justify a continuation of the series, and despite the conclusion, I don't think we have seen the end of Alberich and his quest to destroy the Library.