"Why had he no ticket?"

"The ticket would have shown which station was nearest the agent's house. Therefore he took it from the murdered man's pocket."

"Good, Lestrade, very good," said Holmes. "Your theory holds together. But if this is true, then the case is at an end. On the one hand, the traitor is dead. On the other, the plans of the Bruce-Partington submarine are presumably already on the Continent. What is there for us to do?"

"To act, Sherlock – to act!" cried Mycroft, springing to his feet. "All my instincts are against this explanation. Use your powers! Go to the scene of the crime! See the people concerned! Leave no stone unturned! In all your career you have never had so great a chance of serving your country."

"Well, well!" said Holmes, shrugging his shoulders. "Come, Watson! And you, Lestrade, could you favor us with your company for an hour or two? We will begin our investigation by a visit to Aldgate Station. Good-bye, Mycroft. I shall let you have a report before evening, but I warn you in advance that you have little to expect."

An hour later Holmes, Lestrade and I stood upon the Underground railroad at the point where it emerges from the tunnel immediately before Aldgate Station. A courteous red-faced old gentleman represented the railway company. "This is where the young man's body lay," said he, indicating a spot about three feet from the metals. "It could not have fallen from above, for these, as you see, are all blank walls. Therefore, it could only have come from a train, and that train, so far as we can trace it, must have passed about midnight on Monday."

"Have the carriages been examined for any sign of violence?"

"There are no such signs, and no ticket has been found."

"No record of a door being found open?"

"None."

"We have had some fresh evidence this morning," said Lestrade. "A passenger who passed Aldgate in an ordinary Metropolitan train about 11:40 on Monday night declares that he heard a heavy thud, as of a body striking the line, just before the train reached the station. There was dense fog, however, and nothing could be seen. He made no report of it at the time. Why whatever is the matter with Mr. Holmes?"

My friend was standing with an expression of strained intensity upon his face, staring at the railway metals where they curved out of the tunnel. Aldgate is a junction, and there was a network of points. On these his eager, questioning eyes were fixed, and I saw on his keen, alert face that tightening of the lips, that quiver of the nostrils, and concentration of the heavy tufted brows which I knew so well. "Points," he muttered, "the points."

"What of it? What do you mean?"

"I suppose there are no great number of points on a system such as this?"

"No; there are very few."

"And a curve, too. Points, and a curve. By Jove! if it were only so."

"What is it, Mr. Holmes? Have you a clue?"

"An idea – an indication, no more. But the case certainly grows in interest. Unique, perfectly unique, and yet why not? I do not see any indications of bleeding on the line."

"There were hardly any."

"But I understand that there was a considerable wound."

"The bone was crushed, but there was no great external injury."

"And yet one would have expected some bleeding. Would it be possible for me to inspect the train which contained the passenger who heard the thud of a fall in the fog?"

"I fear not, Mr. Holmes. The train has been broken up before now, and the carriages redistributed."

"I can assure you, Mr. Holmes," said Lestrade, "that every carriage has been carefully examined. I saw to it myself."

It was one of my friend's most obvious weaknesses that he was impatient with less alert intelligences than his own. "Very likely," said he, turning away. "As it happens, it was not the carriages which I desired to examine. Watson, we have done all we can here. We need not trouble you any further, Mr. Lestrade. I think our investigations must now carry us to Woolwich."

At London Bridge, Holmes wrote a telegram to his brother, which he handed to me before dispatching it. It ran thus:

See some light in the darkness, but it may possibly flicker

out. Meanwhile, please send by messenger, to await return

at Baker Street, a complete list of all foreign spies or

international agents known to be in England, with full

address.

SHERLOCK.

"That should be helpful, Watson," he remarked as we took our seats in the Woolwich train. "We certainly owe Brother Mycroft a debt for having introduced us to what promises to be a really very remarkable case."

His eager face still wore that expression of intense and high-strung energy, which showed me that some novel and suggestive circumstance had opened up a stimulating line of thought. See the foxhound with hanging ears and drooping tail as it lolls about the kennels, and compare it with the same hound as, with gleaming eyes and straining muscles, it runs upon a breast-high scent – such was the change in Holmes since the morning. He was a different man from the limp and lounging figure in the mouse-colored dressing-gown who had prowled so restlessly only a few hours before round the fog-girt room.

"There is material here. There is scope," said he. "I am dull indeed not to have understood its possibilities."

"Even now they are dark to me."

"The end is dark to me also, but I have hold of one idea which may lead us far. The man met his death elsewhere, and his body was on the roof of a carriage."

"On the roof!"

"Remarkable, is it not? But consider the facts. Is it a coincidence that it is found at the very point where the train pitches and sways as it comes round on the points? Is not that the place where an object upon the roof might be expected to fall off? The points would affect no object inside the train. Either the body fell from the roof, or a very curious coincidence has occurred. But now consider the question of the blood. Of course, there was no bleeding on the line if the body had bled elsewhere. Each fact is suggestive in itself. Together they have a cumulative force."

"And the ticket, too!" I cried.

"Exactly. We could not explain the absence of a ticket. This would explain it. Everything fits together."

"But suppose it were so, we are still as far as ever from unraveling the mystery of his death. Indeed, it becomes not simpler but stranger."

"Perhaps," said Holmes thoughtfully, "perhaps."

He relapsed into a silent reverie, which lasted until the slow train drew up at last in Woolwich Station. There he called a cab and drew Mycroft's paper from his pocket. "We have quite a little round of afternoon calls to make," said he. "I think that Sir James Walter claims our first attention. "

The house of the famous official was a fine villa with green lawns, stretching down to the Thames. As we reached it the fog was lifting, and a thin, watery sunshine was breaking through. A butler answered our ring. "Sir James, sir!" said he with solemn face. "Sir James died this morning."

"Good heavens!" cried Holmes in amazement. "How did he die?"

"Perhaps you would care to step in, sir, and see his brother, Colonel Valentine?"

"Yes, we had best do so."

We were ushered into a dim-lit drawing-room, where an instant later we were joined by a very tall, handsome, light-bearded man of fifty, the younger brother of the dead scientist. His wild eyes, stained cheeks, and unkempt hair all spoke of the sudden blow which had fallen upon the household. He was hardly articulate as he spoke of it.