"Take the Colonel, for instance, the most harmless, the most good-natured man who ever lived.
Nothing in the world fascinates him so much as the details of a tragedy like this, however gruesome they may be.

I have seen him handle a murderer's knife as though he loved it.

His favourite museum is the professional Chamber of Horrors in Scotland Yard.

My own interests run in a slightly different direction.

I like to look at an affair of this sort as a chess problem, and to set myself to solve it.