If we have no other way of catching him, we can always bait our line with the ring.

I shall have him, Doctor--I'll lay you two to one that I have him.

I must thank you for it all.

I might not have gone but for you, and so have missed the finest study I ever came across: a study in scarlet, eh?
Why shouldn't we use a little art jargon.

There's the scarlet thread of murder running through the colourless skein of life, and our duty is to unravel it, and isolate it, and expose every inch of it.