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 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.

“Good heavens, 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