'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