The Library at Mount Char

I really, really liked the writing and the characters in this book. And I feel that I get the overall premise...but maybe I'm just not smart enough to understand what the whole point of it was? I don't want to go into spoilers, and again I really liked the book overall. It was easy for me to pick up and keep reading, unlike some books where it is a struggle to finish. But I feel like I'm missing some integral part that is preventing me from really understanding what is going on, and thus truly enjoying it.