Well, well, Mr.Holmes, you'll excuse my troubling you about such a trifle--" "I think it's well worth troubling about." "Why, you look very serious over it." "How do you explain it ?" "I just don't attempt to explain it.

It seems the very maddest, queerest thing that ever happened to me." "The queerest perhaps--" said Holmes thoughtfully.
"What do you make of it yourself ?" "Well, I don't profess to understand it yet.

This case of yours is very complex, Sir Henry.

When taken in conjunction with your uncle's death I am not sure that of all the five hundred cases of capital importance which I have handled there is one which cuts so deep.

But we hold several threads in our hands, and the odds are that one or other of them guides us to the truth.