*4,5 stars*

I really loved this book, it's whimsical and magical and peculiar. The writing is absolutely beautiful.

I totally understand why some people don't like this: there's not a defined plot; it's full of metaphors and stories within stories, so it can be very confusing and by the end, I felt like I only understood parts of it; and since it feels like you are reading a story, a myth, a fable, the characters feel like characters in that story not like real people, except for Kat, Kat feels very much real. But I didn't care about any of that, while I read this, I felt like I was lost in a strange and beautiful world. I loved and I was invested in all the stories within stories, I was intrigued by the mystery of this underground library, I was captivated by everything.

It took me a little bit to decide if I liked the ending or not, it was entirely satisfying, but it was the right ending for the story.