Oh geez, this is starting to really boggle my mind... I can't stop asking myself where Harry fits in this whole thing and my mind simply draws a blank. I suppose this means you are doing a great job at the mystery and suspence, but truth be told, I hate being in the dark!!
Oh, only a small detail, this chapter had many expressions that repeated themselves (like chuckle right beside laugh), I suppose it's part of your writting process or maybe a beta job, but you should give your chapter a once over: sometimes it gets a bit confusing...