Help

Just found this site and love it. I have been researching several things and can't find answers. If anyone out there would help me I would love it. 1)Did D. Daniel Judson only write one book;Bone Orchard? 2) did Emmett Clifford only write one; Night whispers? And lastly 3) I'm looking for a book I read about 15 years ago. It was a paperback and the front had a pic of bricks and the paper felt like bricks. I'm almost postive it had "walkers" in the name like wall walkers. It was about spirits caught in and held in a house and they walked in the walls but someone released them and they could travel along certain lines(magnetic?) Does this sound familiar?

http://www.fantasticfiction.co.uk/
Should answer many of these questions.
http://www.fantasticfiction.co.uk/m/graham-masterton/walkers.htm

Looks like this might be your fifteen year old book.