It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth.

The larger crimes are apt to be the simpler, for the bigger the crime, the more obvious, as a rule, is the motive.

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.

There was something awesome in the thought of the solitary mortal standing by the open window and summoning in from the gloom outside the spirits of the nether world.

‎A change of work is the best rest.

It is, I admit, mere imagination; but how often is imagination the mother of truth?

When the spirits are low, when the day appears dark, when work becomes monotonous, when hope hardly seems worth having, just mount a bicycle and go out for a spin down the road, without thought on anything but the ride you are taking.