"Harry Potter and the Half Blood Prince"?
So it doesn't sound exactly like the harry-potter-book-6-title-made-in-heaven, but it does sound logical. And it was revealed in
JKR's website. However, it does not really have the same impact as the other titles. But maybe this is just a practical joke? The piece of paper doesn't really say "Book 6's title is...". There's just the title. And then, why is it that after you see the paper, you also see, in the mirror beside the door, the words "Peeves woz here"? =D
EDIT: In the site, apparently, JKR further said:
"I was delighted to see that a hard core of super-bright fans knew that the real title was once, in the long distant past, a possibility for 'Chamber of Secrets', and from that deduced that it was genuine. Certain crucial pieces of information in book six were originally planned for 'Chamber of Secrets', but very early on (first draft of Chamber) I realised that this information's proper home was book six. I have said before now that 'Chamber' holds some very important clues to the ultimate end of the series. Not as many as six, obviously, but there is a link." So it's true. Gotta re-read "Chamber of Secrets"....
.:chronicled by senator skywalker at 4:44:00 AM:.
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