Hi Chuck!
From the great hall - go to the main hallway by going through the door at center.
You should now be at the hallway on the main level.
Here there are 3 ghosts. Left side, middle and right side of the hallway.
Turn left and go close to the cricket trophy. Turn around and click on ghost on the left wall.
The one is across the kitchen door at center of hallway.
The other is at right end.
Check both right and left walls.