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." "No, no, it was a hound.

My God, can there be some truth in all these stories?
Is it possible that I am really in danger from so dark a cause?
You don't believe it, do you, Watson ?" "No, no." "And yet it was one thing to laugh about it in London, and it is another to stand out here in the darkness of the moor and to hear such a cry as that.

And my uncle! There was the footprint of the hound beside him as he lay.

It all fits together.