Read it through once

“Tradition says that these ghosts have never been seen—they have merely been heard. It is plain that this room was once larger than it is now, and that the wall at this end was built in some bygone time to make and fence off a narrow room there. There is no communication anywhere with that narrow room, and if it exists—and of that there is no reasonable doubt—it has no light and no air, but is an absolute dungeon. Wait where you are, and take note of what happens.”