I just finished "Ghosts," and I have to say, it blew me away. It had one of the spookiest scenes I've ever read, right up there with the best of Shirley Jackson. Makes me wish Ed (or Evan) had written more speculative material. I've read more than a dozen 87th Precinct novels, and this might be my favorite so far.
First McBain I ever read, when I was about 13. I picked it up because I was looking for mystery books with ghosts (my reading was still rather immature, obviously). I remember reading it and just being enthralled by it but just waiting and waiting and WAITING for the ghost to show up!
It completely changed everything I would read from that point on, and still influences my own writing.