Hi, I was wondering if anyone knew the title of this book.  I'm also going to try abebooks.com.

I read this book in an elementary school library about ten or so years ago.  I remember it was about this boy who was about elementary-school age.  He met a family [I think] of ghosts.  I think his name was Gregory, and I think he was from London.  The cover, I think, was dark-ish blue, with the ghosts and the boy on the cover.  The title may have been something like "Gregory and the Ghosts" but there's no books I can find under that title.

I remember one specific part of the book where he's talking to a [literal] vampire bat, and he says that it's gross and wrong to suck the blood out of humans, and the bat replies by saying it's worse that Gregory [?] has leather shoes, because they had to kill the cow to get them.

That's all I remember, sorry >.<  Any help would be greatly appreciated.

You might try posting this over at the Book Stumper on www.loganberrybooks.com