Where does Jacob's mind end and where does reality begin? That is something you'll wonder about more than once reading this book. Maybe I already spoiled too much...
Have you ever met one of those people that you just can't really figure out? It's not like they're hiding anything or they're being mysterious ("mysterious" people are usually really easy to figure out). There's just something about them. No matter how much time you spend with them, how many questions you ask them and how much data you calculate on their answers, you just still cannot see through them nor predict them and that's what makes them so exiting to be around and they don't even know it themselves. Those are my favorite kind of people, and this is my favorite book, because it is just like that.