"That it was written in a train; the good writing represents stations, the bad writing movement, and the very bad writing passing over points. A scientific expert would pronounce at once that this was drawn up on a suburban line, since nowhere save in the immediate vicinity of a great city could there be so quick a succession of points. Granting that his whole journey was occupied in drawing up the will, then the train was an express, only stopping once between Norwood and London Bridge."
Lestrade began to laugh.
"You are too many for me when you begin to get on your theories, Mr. Holmes," said he. "How does this bear on the case?"
"Well, it corroborates the young man's story to the extent that the will was drawn up by Jonas Oldacre in his journey yesterday. It is curious -- is it not? -- that a man should draw up so important a document in so haphazard a fashion. It suggests that he did not think it was going to be of much practical importance. If a man drew up a will which he did not intend ever to be effective he might do it so."
"Well, he drew up his own death-warrant at the same time," said Lestrade.
"Oh, you think so?"
"Don't you?"
"Well, it is quite possible; but the case is not clear to me yet."
"Not clear? Well, if that isn't clear, what COULD be clear? Here is a young man who learns suddenly that if a certain older man dies he will succeed to a fortune. What does he do? He says nothing to anyone, but he arranges that he shall go out on some pretext to see his client that night; he waits until the only other person in the house is in bed, and then in the solitude of a man's room he murders him, burns his body in the wood-pile, and departs to a neighbouring hotel. The blood-stains in the room and also on the stick are very slight. It is probable that he imagined his crime to be a bloodless one, and hoped that if the body were consumed it would hide all traces of the method of his death -- traces which for some reason must have pointed to him. Is all this not obvious?"
"It strikes me, my good Lestrade, as being just a trifle too obvious," said Holmes. "You do not add imagination to your other great qualities; but if you could for one moment put yourself in the place of this young man, would you choose the very night after the will had been made to commit your crime? Would it not seem dangerous to you to make so very close a relation between the two incidents? Again, would you choose an occasion when you are known to be in the house, when a servant has let you in? And, finally, would you take the great pains to conceal the body and yet leave your own stick as a sign that you were the criminal? Confess, Lestrade, that all this is very unlikely."
"As to the stick, Mr. Holmes, you know as well as I do that a criminal is often flurried and does things which a cool man would avoid. He was very likely afraid to go back to the room. Give me another theory that would fit the facts."
"I could very easily give you half-a-dozen," said Holmes. "Here, for example, is a very possible and even probable one. I make you a free present of it. The older man is showing documents which are of evident value. A passing tramp sees them through the window, the blind of which is only half down. Exit the solicitor. Enter the tramp! He seizes a stick, which he observes there, kills Oldacre, and departs after burning the body."