The Final Problem

"He is the organiser of half that is evil an of nearly all that is undetected in this great city.   He is a genius, a philosopher, an abstract thinker.   He has a brain of the first order.   He sits motionless, like a spider in the centre of its web, but that web has a thousand radiations, and he knows well every quiver of each of them.   He does little himself.   He only plans.   But his agents are numerous and splendidly organised.   Is there a crime to be done, a paper to be abstracted, we will say, a house to be rifled, a man to be removed - the word is passed to the professor, the matter is organised and carried out."