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."