Afterwards I discovered that he forgot to re-lock it.
Then I recalled the expression of his face the previous night,
and with that the memory of all I had experienced reconstructed
itself before me. Even as that fear came back to me came a cry
from within; but this time it was not the cry of a puma.
I put down the mouthful that hesitated upon my lips, and listened.
Silence, save for the whisper of the morning breeze. I began to think my
ears had deceived me.

After a long pause I resumed my meal, but with my ears still vigilant.
Presently I heard something else, very faint and low.
I sat as if frozen in my attitude. Though it was faint and low,
it moved me more profoundly than all that I had hitherto heard of
the abominations behind the wall. There was no mistake this time in
the quality of the dim, broken sounds; no doubt at all of their source.
For it was groaning, broken by sobs and gasps of anguish.
It was no brute this time; it was a human being in torment!

As I realised this I rose, and in three steps had crossed the room,
seized the handle of the door into the yard, and flung it open
before me.

"Prendick, man! Stop!" cried Montgomery, intervening.

A startled deerhound yelped and snarled. There was blood, I saw,
in the sink,--brown, and some scarlet--and I smelt the peculiar
smell of carbolic acid. Then through an open doorway beyond,
in the dim light of the shadow, I saw something bound painfully
upon a framework, scarred, red, and bandaged; and then blotting
this out appeared the face of old Moreau, white and terrible.