I believe that something came from the moor. I believe he saw the Hound of the Baskervilles.
Yes, yes, said Holmes, but how do you know that Sir Charles waited by this wooden gate?
Because he smoked a cigar," said Dr Mortimer. I saw the white cigar ash on the ground.'
"Good,' said Holmes, "good - you are a detective."
"Thank you," said Dr Mortimer, with a smile.
But you believe that Sir Charles was killed by a gigantic hound?"