Two Sherlock Holmes Parodiesw/ Direct link technology (A Classic Mystery tale)

'I see you are surprised. It is really too simple to talk about, but, from my position opposite the mirror, I can see the reflection of objects in the street. A man stopped, looked at one of my cards, and then glanced across the street. I recognised my card, because, as you know, they are all in scarlet. If, as you say, London is talking of this mystery, it naturally follows that he will talk of it, and the chances are he wished to consult with me upon it. Anyone can see that, besides there is always--Come in!