Trembling, and more frightened now than at my descent at my own footfall and tremulous pursuing shadow, I went up-stairs.
As I passed the corridor leading to the converted vestibule which had so excited my interest in the afternoon, I paused and made a hurried calculation.

If the stick had been three feet long, as I judged, and my stride was thirty inches, then the place of that hole in the wall below was directly in a line with where I now stood,--in other words, under the vestibule floor, as I had already, suspected.
How was I to verify this without disturbing Mrs.Packard?
That was a question to sleep on.

But it took me a long time to get to sleep..