Basically my theory on book is that every time she dies she becomes a new book since the guys in the recovery center don't know what to make the inside of her look like, explaining why she is always a different type of book. After she gets recovered she either automatically knows what book she is or reads herself when recovered. This would explain how she always knows which book she is all the time. So if she says she is a different book but we haven't seen her die, she probably died offscreen. So let me know if you agree or have any questions about this theory and thanks for reading!
