And X, I suppose, is some unknown woman, the one
that he plans to kill tonight,' I said. 'But how do you
know where to put the X on your diagram?'
'Look again, Watson,' Holmes said with a smile.
Suddenly, I understood. 'It is a letter M!'
'Yes, Watson. M for murder, M for .. .' 'Moriarty!
Holmes, do you mean to say ... ?'
'Yes. He is writing his name in blood upon the face of
Whitechapel. And, as you see, I know where he will
try to kill tonight, and where I shall go to meet him.'
'Not without me,' I said. 'I must come with you.' We
left the police station just before midnight.