What are your all-time favorite novels (or shorter stories) featuring ghosts?
The ones that come to mind for me are from my childhood, and are YA books: The Ghost Next Door by Wylly Folk St. John and Wait Till Helen Comes by Mary Downing Hahn. In addition, I rather enjoyed Nora Roberts' "In the Garden" trilogy, which dealt with a haunted house owned by a garden nursery proprietor. And who could forget Jacob Marley and the three Christmas ghosts coming back to haunt Ebenezer Scrooge?
Hopefully when you answer with your favorites, I'll remember some other good ones, or discover some new gems.