`Are you armed?' I asked.
`I have a hunting-crop.'
`We must close in on him rapidly, for he is said to be a desperate fellow. We shall take him by surprise and have him at our mercy before he can resist.'
`I say, Watson,' said the baronet, `what would Holmes say to this? How about that hour of darkness in which the power of evil is exalted?'
As if in answer to his words there rose suddenly out of the vast gloom of the moor that strange cry which I had already heard upon the borders of the great Grimpen Mire. It came with the wind through the silence of the night, a long, deep mutter then a rising howl, and then the sad moan in which it died away. Again and again it sounded, the whole air throbbing with it, strident, wild, and menacing. The baronet caught my sleeve and his face glimmered white through the darkness.
`My God, what's that, Watson?'
`I don't know. It's a sound they have on the moor. I heard it once before.'
It died away, and an absolute silence closed in upon us. We stood straining our ears, but nothing came.
`Watson,' said the baronet, `it was the cry of a hound.'
My blood ran cold in my veins, for there was a break in his voice which told of the sudden horror which had seized him.
`What do they call this sound?' he asked.
`Who?'
`The folk on the countryside.'
`Oh, they are ignorant people. Why should you mind what they call it?'
`Tell me, Watson. What do they say of it?'
I hesitated but could not escape the question.
`They say it is the cry of the Hound of the Baskervilles.'
He groaned and was silent for a few moments.
`A hound it was,' he said at last, `but it seemed to come from miles away, over yonder, I think.'
`It was hard to say whence it came.'
`It rose and fell with the wind. Isn't that the direction of the great Grimpen Mire?'
`Yes, it is.'
`Well, it was up there. Come now, Watson, didn't you think yourself that it was the cry of a hound?
I am not a child. You need not fear to speak the truth.'
`Stapleton was with me when I heard it last. He said that it might be the calling of a strange bird.'