I felt a creeping of the flesh, and a presentiment of coming horror, even before Sherlock Holmes answered.

“The word RACHE, written in letters of blood,” he said.

“That was it,” said Lestrade, in an awestruck voice; and we were all silent for a while.

There was something so methodical and so incomprehensible about the deeds of this unknown assassin, that it imparted a fresh ghastliness to his crimes. My nerves, which were steady enough on the field of battle, tingled as I thought of it.

“The man was seen,” continued Lestrade. “A milk boy, passing on his way to the dairy, happened to walk down the lane which leads from the mews at the back of the hotel. He noticed that a ladder, which usually lay there, was raised against one of the windows of the second floor, which was wide open. After passing, he looked back and saw a man descend the ladder. He came down so quietly and openly that the boy imagined him to be some carpenter or joiner at work in the hotel. He took no particular notice of him, beyond thinking in his own mind that it was early for him to be at work. He has an impression that the man was tall, had a reddish face, and was dressed in a long, brownish coat. He must have stayed in the room some little time after the murder, for we found blood-stained water in the basin, where he had washed his hands, and marks on the sheets where he had deliberately wiped his knife.”

I glanced at Holmes on hearing the description of the murderer which tallied so exactly with his own. There was, however, no trace of exultation or satisfaction upon his face.

“Did you find nothing in the room which could furnish a clue to the murderer?” he asked.

“Nothing. Stangerson had Drebber’s purse in his pocket, but it seems that this was usual, as he did all the paying. There was eighty-odd pounds in it, but nothing had been taken. Whatever the motives of these extraordinary crimes, robbery is certainly not one of them. There were no papers or memoranda in the murdered man’s pocket, except a single telegram, dated from Cleveland about a month ago, and containing the words, ‘J. H. is in Europe.’ There was no name appended to this message.”

“And there was nothing else?” Holmes asked.

“Nothing of any importance. The man’s novel, with which he had read himself to sleep, was lying upon the bed, and his pipe was on a chair beside him. There was a glass of water on the table, and on the window-sill a small chip ointment box containing a couple of pills.”

Sherlock Holmes sprang from his chair with an exclamation of delight.

“The last link,” he cried, exultantly. “My case is complete.”

The two detectives stared at him in amazement.

“I have now in my hands,” my companion said, confidently, “all the threads which have formed such a tangle. There are, of course, details to be filled in, but I am as certain of all the main facts, from the time that Drebber parted from Stangerson at the station, up to the discovery of the body of the latter, as if I had seen them with my own eyes. I will give you a proof of my knowledge. Could you lay your hand upon those pills?”

“I have them,” said Lestrade, producing a small white box; “I took them and the purse and the telegram, intending to have them put in a place of safety at the police station. It was the merest chance my taking these pills, for I am bound to say that I do not attach any importance to them.”

“Give them here,” said Holmes. “Now, Doctor,” turning to me, “are those ordinary pills?”

They certainly were not. They were of a pearly gray colour, small, round, and almost transparent against the light. “From their lightness and transparency, I should imagine that they are soluble in water,” I remarked.