“Then we must take that as our working hypothesis. Young West took the papers. Now this could only be done by having a false key—”
“Several false keys. He had to open the building and the room.”
“He had, then, several false keys. He took the papers to London to sell the secret, intending, no doubt, to have the plans themselves back in the safe next morning before they were missed. While in London on this treasonable mission he met his end.”
“How?”
“We will suppose that he was travelling back to Woolwich when he was killed and thrown out of the compartment.”
“Aldgate, where the body was found, is considerably past the station for London Bridge, which would be his route to Woolwich.”
“Many circumstances could be imagined under which he would pass London Bridge. There was someone in the carriage, for example with whom he was having an absorbing interview. This interview led to a violent scene, in which he lost his life. Possibly he tried to leave the carriage, fell out on the line, and so met his end. The other closed the door. There was a thick fog, and nothing could be seen.”
“No better explanation can be given with our present knowledge; and yet consider, Sherlock,
