[BetteDavisEyes]

Do not read this if you want to figure out what's behind J.K.'s door all by yourself. Just pass this post up b/c it has spoilers for those of you who are curious but don't want to do the work yourself or don't have time.
First of all, you're going to have to be patient to get the clues & solve the puzzle.
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Now, you have to wait for Peeves to show up & knock down the vase of flowers. Once he has done that, a bunch of keys are going to start popping out of the vase. You have to work quickly b/c the keys start flying away after a while. Grab any key & try to fit it in the doorlock. Keep at this until the right keys turns & the door opens. Now, open the drawer on the lower left side & grab the magnifying glass. Drag the magnifying glass to the stack of papers on the left side. You'll have to answer a riddle to get the clues. Now skip this part of you don't want the answer to the riddle.
The answer is CHAPTERS. You'll then see pages fly out. You can only click & drag on three of the pages. They will give you the titles to three of the chapters from Book 6, Harry Potter and the Half-Blood Prince.
Chapter 2 is called SPINNERS END
Chapter 6 is called DRACO'S DETOUR (so excited about this one b/c it is a whole chapter dedicated to Malfoy. *sigh*)
Chapter 14 is called FELIX FELICIS (Is this Latin?)

Have fun with it & all the speculation kiddies!