Oof. I know lots of people loved this book, but I don't understand how it was so well received. I disliked the characters (I seriously wasn't sure if there was something WRONG with Oliver. Sometimes he seemed like Ruth's kid.) I didn't believe that any of these things would happen this way. How convenient that (view spoiler)[the reason Ruth can't find any info about Nao is that her father has scrubbed her identity from the internet! (hide spoiler)] Of course her cat is named after Schrodinger! 
 This felt like a Disney movie (and I usually like Disney movies) where the character is onto a mystery that unfolds perfectly in front of her. 
 Almost all of the scenes with Ruth bored me. And Nao's parts were confusing because some of them were well-written, obviously at the hand of a talented adult, and some of them were just how a teenager would write. And to be honest, I don't really like to read books written by a teenager who doesn't know how to write. 
 I cannot believe I finished this. This has never happened to me before, but 3/4 of the way in I realized I was so miserable I didn't think I'd ever like reading another book again. I thought, "maybe I don't like reading at all. This isn't fun." I did just finish a book I loved (Mischling) so maybe this was like a rebound book. Maybe I wouldn't have enjoyed anything after reading something as powerful and moving as Mischling. 
 I am just relieved it's over and excited to move on to another book. But I do wonder why I stuck with it for so long. I don't think I gained anything and I would not recommend this to anyone.