Where is he behind the attic wall like Anne flaming Frank?

The paneling looked different somehow from the rest of the attic wall.

While she was gone, Nancy inspected the rest of the attic walls and floor.

There was no open space behind that portion of the attic wall.

She was positive that the creaking sounds were coming from somewhere behind the attic wall!

He got up and went to peer out of the small window set in the attic wall.

Cassandra led him through the trunks and boxes to where a long cheval glass stood propped against the attic wall.

I leaned against the attic wall, feeling dizzy but in a way triumphant.

Once it is out, the ghost feels the attic walls, in search of something.

So what was her theory except the song of the Woodpecker, bounced a few times too many off bare attic walls?