The North Tower #44: The Crux of It All
The problem, I find, with Book 6 is that JKR throws in so much new stuff (most of which is probably entirely inconsequential) to just (in my mind) try to throw the reader off track as much as possible. There is so much information and so many new characters in this book, which is very different from the other five, that there must be a whole net of red herrings among them.