“Death from some powerful vegetable alkaloid,” I answered,—“some strychnine-like substance which would produce tetanus.”

“That was the idea which occurred to me the instant I saw the drawn muscles of the face. On getting into the room I at once looked for the means by which the poison had entered the system. As you saw, I discovered a thorn which had been driven or shot with no great force into the scalp. You observe that the part struck was that which would be turned towards the hole in the ceiling if the man were erect in his chair. Now examine the thorn.”

I took it up gingerly and held it in the light of the lantern. It was long, sharp, and black, with a glazed look near the point as though some gummy substance had dried upon it. The blunt end had been trimmed and rounded off with a knife.

“Is that an English thorn?” he asked.

“No, it certainly is not.”

“With all these data you should be able to draw some just inference. But here are the regulars; so the auxiliary forces may beat a retreat.”

As he spoke, the steps which had been coming nearer sounded loudly on the passage, and a very stout, portly man in a grey suit strode heavily into the room. He was red-faced, burly and plethoric, with a pair of very small twinkling eyes which looked keenly out from between swollen and puffy pouches. He was closely followed by an inspector in uniform, and by the still palpitating Thaddeus Sholto.

“Here’s a business!” he cried, in a muffled, husky voice. “Here’s a pretty business! But who are all these? Why, the house seems to be as full as a rabbit-warren!”

“I think you must recollect me, Mr. Athelney Jones,” said Holmes, quietly.

“Why, of course I do!” he wheezed. “It’s Mr. Sherlock Holmes, the theorist. Remember you! I’ll never forget how you lectured us all on causes and inferences and effects in the Bishopgate jewel case. It’s true you set us on the right track; but you’ll own now that it was more by good luck than good guidance.”

“It was a piece of very simple reasoning.”

“Oh, come, now, come! Never be ashamed to own up. But what is all this? Bad business! Bad business! Stern facts here,—no room for theories. How lucky that I happened to be out at Norwood over another case! I was at the station when the message arrived. What d’you think the man died of?”

“Oh, this is hardly a case for me to theorise over,” said Holmes, dryly.

“No, no. Still, we can’t deny that you hit the nail on the head sometimes. Dear me! Door locked, I understand. Jewels worth half a million missing. How was the window?”

“Fastened; but there are steps on the sill.”