“Why, bless you, sir, it is in the steam launch that he has gone. That’s what puzzles me; for I know there ain’t more coals in her than would take her to about Woolwich and back. If he’s been away in the barge I’d ha’ thought nothin’; for many a time a job has taken him as far as Gravesend, and then if there was much doin’ there he might ha’ stayed over. But what good is a steam launch without coals?”

“He might have bought some at a wharf down the river.”

“He might, sir, but it weren’t his way. Many a time I’ve heard him call out at the prices they charge for a few odd bags. Besides, I don’t like that wooden-legged man, wi’ his ugly face and outlandish talk. What did he want always knockin’ about here for?”

“A wooden-legged man?” said Holmes with bland surprise.

“Yes, sir, a brown, monkey-faced chap that’s called more’n once for my old man. It was him that roused him up yesternight, and, what’s more, my man knew he was comin’, for he had steam up in the launch. I tell you straight, sir, I don’t feel easy in my mind about it.”

“But, my dear Mrs. Smith,” said Holmes, shrugging his shoulders, “you are frightening yourself about nothing. How could you possibly tell that it was the wooden-legged man who came in the night? I don’t quite understand how you can be so sure.”

“His voice, sir. I knew his voice, which is kind o’ thick and foggy. He tapped at the winder-about three it would be. ‘Show a leg, matey,’ says he: ‘time to turn out guard.’ My old man woke up Jim - that’s my eldest - and away they went without so much as a word to me. I could hear the wooden leg clackin’ on the stones.”

“And was this wooden-legged man alone?”

“Couldn’t say, I am sure, sir. I didn’t hear no one else.”

“I am sorry, Mrs. Smith, for I wanted a steam launch, and I have heard good reports of the - - Let me see, what is her name?”

“The Aurora, sir.”

“Ah! She’s not that old green launch with a yellow line, very broad in the beam?”

“No, indeed. She’s as trim a little thing as any on the river. She’s been fresh painted, black with two red streaks.”

“Thanks. I hope that you will hear soon from Mr. Smith. I am going down the river, and if I should see anything of the Aurora I shall let him know that you are uneasy. A black funnel, you say?”

“No, sir. Black with a white band.”

“Ah, of course. It was the sides which were black. Good-morning, Mrs. Smith. There is a boatman here with a wherry, Watson. We shall take it and cross the river.”

“The main thing with people of that sort,” said Holmes as we sat in the sheets of the wherry, “is never to let them think that their information can be of the slightest importance to you. If you do they will instantly shut up like an oyster. If you listen to them under protest, as it were, you are very likely to get what you want.”

“Our course now seems pretty clear,” said I.

“What would you do, then?”

“I would engage a launch and go down the river on the track of the Aurora.”

“My dear fellow, it would be a colossal task. She may have touched at any wharf on either side of the stream between here and Greenwich. Below the bridge there is a perfect labyrinth of landing-places for miles. It would take you days and days to exhaust them if you set about it alone.”

“Employ the police, then.”

“No. I shall probably call Athelney Jones in at the last moment. He is not a bad fellow, and I should not like to do anything which would injure him professionally. But I have a fancy for working it out myself, now that we have gone so far.”

“Could we advertise, then, asking for information from wharfingers?”