'Then, in August, everything changed. Criminals
became stupid again. In the middle of all his success,
Moriarty had disappeared. Why?'
'Holmes!' I cried. 'The reason is clear. The Whitechapel
murders began in August. It must be .. .'
'No, Watson,' Holmes said. 'It is not clear. Someone
like Moriarty does not break locks and climb through
windows himself. He gave orders to others. He was
the commander-in-chief of the criminal world, not a
foot-soldier.'
'Then why ... I mean, how ... ?'
'Success is too easy for him. He needs change and
danger as others need drugs. He was the best at
mathematics, then the best at crime. Now he has
chosen murder.'