He filled his pipe, threw himself into his deep-seated armchair, placed his feet on the mantel, and clasped his hands behind his head.

'Tell me about it,' he said simply.

'Old Barrie Kipson,' I began, 'was a stockbroker in the City. He lived in Pegram, and it was his custom to—'

'COME IN!' shouted Kombs, without changing his position, but with a suddenness that startled me. I had heard no knock.

'Excuse me,' said my friend, laughing, 'my invitation to enter was a trifle premature. I was really so interested in your recital that I spoke before I thought, which a detective should never do. The fact is, a man will be here in a moment who will tell me all about this crime, and so you will be spared further effort in that line.'

'Ah, you have an appointment. In that case I will not intrude,' I said, rising.

'Sit down; I have no appointment. I did not know until I spoke that he was coming.'

I gazed at him in amazement. Accustomed as I was to his extraordinary talents, the man was a perpetual surprise to me. He continued to smoke quietly, but evidently enjoyed my consternation.

'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!

There was a rap at the door this time.