At that moment, we heard a strange sound. It was a deep howling sound. It came from some distance away.
'What's that?' asked Sir Henry. There was fear in his voice.
I was afraid too. 'It sounds like a dog,' I said. 'It sounds like a very large dog. Shall we turn back?'
'No,' said Sir Henry. 'We are nearly there. Look!'
In front of us, we saw the signal light clearly. It came from a lamp which stood on a rock. Beside the rock was a man, but the man did not see us. He was looking in the other direction.
Again we heard that deep howling sound - the sound of a huge dog. The sound was much nearer now. We heard the sound again. It was coming nearer all the time! The man by the rock heard the sound as well. He picked up the lantern and jumped on the rock. He looked one way, then the other. Suddenly he jumped off the rock and started to run.
He ran towards High Tor. He was running away from us. But he was not running away because he saw us. He was running away from something else which we could not see.
'Quick, Dr Watson, follow him!' shouted Sir Henry. 'Get your revolver ready.'
We ran along the narrow path. Near us, we heard the deep howling sound. It was very near and very loud. Then we heard a scream. We stopped.
'Be careful, Dr Watson,' said Sir Henry. 'Let us go forward slowly.'
The night was silent. We walked forward slowly. There was something, or someone, lying near the bottom of the Tor. We went over to it. I held my revolver in front of me.
We found the body of a man at the foot of the Tor.