More on HP
Spoilers follow - but I have a candidate for the mystery at the end of book 6! (Don’t read if you want to try and work it out for yourself!) (Update: Comments show that I’m not even the first on my own site! Oh well! 
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I decided to compromise - rather than read the books again, I thought I’d check through the HP Lexicon to see what wizards have a first name R. and a last name B, and hopefully a middle name “A.”. The only candidate? Regulus Black, Sirius’ younger brother! Aha! Oddly, I had the nagging notion of someone to do with the Blacks, but I couldn’t put my finger on it. Remember that he used to be a Death Eater, but then backed out, and so was killed! It seems quite possible that he might have figured out Voldemort’s secret, and stolen the amulet. But was it destroyed? Or is it, perhaps, somewhere in Sirius’ old house? Maybe Kreacher would know?
The fan sites seem to be in agreement, though I haven’t seen many details yet. Well, that’s enough Harry Potter - back to work!