7:30 that evening. There was no quarrel between them and she can give
no motive for his action. The next thing heard of him was when his
dead body was discovered by a plate-layer named Mason, just outside
Aldgate Station on the Underground system in London."

"When?"

"The body was found at six on Tuesday morning. It was lying wide of
the metals upon the left hand of the track as one goes eastward, at a
point close to the station, where the line emerges from the tunnel in
which it runs. The head was badly crushed--an injury which might well
have been caused by a fall from the train. The body could only have
come on the line in that way. Had it been carried down from any
neighbouring street, it must have passed the station barriers, where a
collector is always standing. This point seems absolutely certain."

"Very good. The case is definite enough. The man, dead or alive,
either fell or was precipitated from a train. So much is clear to me.
Continue."

"The trains which traverse the lines of rail beside which the body was
found are those which run from west to east, some being purely
Metropolitan, and some from Willesden and outlying junctions. It can
be stated for certain that this young man, when he met his death, was
travelling in this direction at some late hour of the night, but at
what point he entered the train it is impossible to state."

"His ticket, of course, would show that."

"There was no ticket in his pockets."

"No ticket! Dear me, Watson, this is really very singular. According
to my experience it is not possible to reach the platform of a
Metropolitan train without exhibiting one's ticket. Presumably, then,
the young man had one. Was it taken from him in order to conceal the
station from which he came? It is possible. Or did he drop it in the
carriage? That is also possible. But the point is of curious
interest. I understand that there was no sign of robbery?"

"Apparently not. There is a list here of his possessions. His purse
contained two pounds fifteen. He had also a check-book on the Woolwich
branch of the Capital and Counties Bank. Through this his identity was
established. There were also two dress-circle tickets for the Woolwich
Theatre, dated for that very evening. Also a small packet of technical
papers."

Holmes gave an exclamation of satisfaction.

"There we have it at last, Watson! British government--Woolwich.
Arsenal--technical papers--Brother Mycroft,