down the corridor, toward my study. In an instant, I was on my feet, and
grasping my rifle. Noiselessly, I waited. Had the creatures broken in,
whilst I slept? Even as I questioned, the steps reached my door, halted
momentarily, and then continued down the passage. Silently, I tiptoed to
the doorway, and peeped out. Then, I experienced such a feeling of
relief, as must a reprieved criminal--it was my sister. She was going
toward the stairs.

I stepped into the hall, and was about to call to her, when it occurred
to me, that it was very queer she should have crept past my door, in
that stealthy manner. I was puzzled, and, for one brief moment, the
thought occupied my mind, that it was not she, but some fresh mystery of
the house. Then, as I caught a glimpse of her old petticoat, the thought
passed as quickly as it had come, and I half laughed. There could be no
mistaking that ancient garment. Yet, I wondered what she was doing; and,
remembering her condition of mind, on the previous day, I felt that it
might be best to follow, quietly--taking care not to alarm her--and see
what she was going to do. If she behaved rationally, well and good; if
not, I should have to take steps to restrain her. I could run no
unnecessary risks, under the danger that threatened us.

Quickly, I reached the head of the stairs, and paused a moment. Then,
I heard a sound that sent me leaping down, at a mad rate--it was the
rattle of bolts being unshot. That foolish sister of mine was actually
unbarring the back door.

Just as her hand was on the last bolt, I reached her. She had not seen
me, and, the first thing she knew, I had hold of her arm. She glanced up
quickly, like a frightened animal, and screamed aloud.