Really, if I can't answer that question, you could call it the biggest insult to a book, or the saddest state of things. But it's the hardest thing to read, I think.
Have you ever heard of Charlotte Sometimes? The answer could easily be no. Kids' book. It's so depressing, though, because it's such a good idea that's so poorly executed. I really don't know what Charlotte learned from her adventures in a body-switching, time-traveling situation. You don't know her at all before she wakes up in the wrong time, and she really never does anything or has any thoughts besides wanting to go home.
The book might be about identity--what, besides how you look, makes you recognizably you? But it never really answers these questions. And I think that, if I can't even figure out for sure what questions you're asking, or even trying to answer, then you've failed in a sad way. It wasn't even entertaining! I'll accept that as a reason to tell a story--it's a romp!
But no. You've got nothing for me. Sorry state of affairs.