pected 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-coloured 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