I do agree, because as it is now, that seems quite impossible. Impossible things happening are the best kind of plot twists. I am liking the title, because it sets a dark enough mood for the book, and it may sound cliche, but I hope it will be relevant to the story and mood setting. I don't care that much about the title, though, I am by far the most interested in what becomes of Snape. (SPOILER)Every point that has been made for him being on either side could easily mean he is on the opposite side. He is completely unpredictable, and I hope he is secretly working against both Dumbledore and Voldemort, and moving toward his own goal, which would have been totally hidden for the first six books.