wager he found his way home all right."
"How was he dressed?"
"A brown overcoat."
"Had he a whip in his hand?"
"A whip—no."
"He must have left it behind," muttered my companion. "You didn't happen to see or hear a cab after that?"
"No."
"There's a half-sovereign for you," my companion said, standing up and taking his hat. "I am afraid, Rance, that you will never rise in the force. That head of yours should be for use as well as ornament. You might have gained your sergeant's stripes last night. The man whom you held in your hands is the man who holds the clue of this mystery, and whom we are seeking. There is no use of arguing about it now; I tell you that it is so. Come along, Doctor."
We started off for the cab together, leaving our informant incredulous, but obviously uncomfortable.
"The blundering fool!" Holmes said, bitterly, as we drove back to our lodgings. "Just to think of his having such an incomparable bit of good luck, and not taking advantage of it."
"I am rather in the dark still. It is true that the description of this man tallies with your idea of the second party in this mystery. But why should he come back to the house after leaving it? That is not the way of criminals."
"The ring, man, the ring: that was what he came back for. 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. And now for lunch, and then for Norman Neruda. Her attack and her bowing are splendid. What's that little thing of Chopin's she plays so magnificently: Tra-la-la-lira-lira-lay."
Leaning back in the cab, this amateur blood-hound carolled away like a lark while I meditated upon the manysidedness of the human mind.
CHAPTER V
OUR ADVERTISEMENT BRINGS A VISITOR
Our morning's exertions had been too much for my weak health, and I was tired out in the afternoon. After Holmes' departure for the concert, I lay down upon the sofa and endeavoured to get a couple of hours' sleep. It was a useless attempt. My mind had been too much excited by all that had occurred, and the strangest fancies and surmises crowded into it.
