“[O]n general principles it is best that I should not leave the country. Scotland Yard feels lonely without me, and it causes an unhealthy excitement among the criminal classes.”

“I'm not leaving until you tell me why you followed me. I know I'm a fascinating guy, but this is starting to feel like an unhealthy obsession.”

“Beautiful, Glorious Scotland, has spoilt me for every other country.”

“I'm not working-class: I come from the criminal classes.”

“Americans are generally incapable of perceiving class differences among blacks and are quick to ascribe antisocial underclass behavior to all African Americans.”

“There are no crimes and no criminals in these days. What is the use of having brains in our profession? I know well that I have it in me to make my name famous. No man lives or has ever lived who has brought the same amount of study and of natural talent to the detection of crime which I have done. And what is the result? There is no crime to detect, or, at most, some bungling villainy with a motive so transparent that even a Scotland Yard official can see through it.”