“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?”

“Worse and worse! Our men would know that the chase was hot at their heels, and they would be off out of the country. As it is, they are likely enough to leave, but as long as they think they are perfectly safe they will be in no hurry. Jones’s energy will be of use to us there, for his view of the case is sure to push itself into the daily press, and the runaways will think that every one is off on the wrong scent.”

“What are we to do, then?” I asked, as we landed near Millbank Penitentiary.

“Take this hansom, drive home, have some breakfast, and get an hour’s sleep. It is quite on the cards that we may be afoot to-night again. Stop at a telegraph-office, cabby! We will keep Toby, for he may be of use to us yet.”