“I have an idea,” he said. “From what you say, this matter wants looking into pretty carefully. Now, I am going down on the tender to-day to make inquiries on the spot. What do you say to coming with me as adviser—as a matter of business, of course—you and Dr. Jervis? I shall start about eleven; we shall be at the lighthouse by three o’clock, and you can get back to town to-night, if you want to. What do you say?”

“There’s nothing to hinder us,” I put in eagerly, for even at Bugsby’s Hole the river looked very alluring on this summer morning.

“Very well,” said Thorndyke, “we will come. Jervis is evidently hankering for a sea-trip, and so am I, for that matter.”

“It’s a business engagement, you know,” the captain stipulated.

“Nothing of the kind,” said Thorndyke; “it’s unmitigated pleasure; the pleasure of the voyage and your high well-born society.”

“I didn’t mean that,” grumbled the captain, “but, if you are coming as guests, send your man for your nightgear and let us bring you back tomorrow evening.”

“We won’t disturb Polton,” said my colleague; “we can take the train from Blackwall and fetch our things ourselves. Eleven o’clock, you said?”

“Thereabouts,” said Captain Grumpass; “but don’t put yourselves out.”

The means of communication in London have reached an almost undesirable state of perfection. With the aid of the snorting train and the tinkling, two-wheeled “gondola,” we crossed and re-crossed the town with such celerity that it was barely eleven when we reappeared on Trinity Wharf with a joint Gladstone and Thorndyke’s little green case.

The tender had hauled out of Bow Creek, and now lay alongside the wharf with a great striped can buoy dangling from her derrick, and Captain Grumpass stood at the gang way, his jolly, red face beaming with pleasure. The buoy was safely stowed forward, the derrick hauled up to the mast, the loose shrouds rehooked to the screw-lanyards, and the steamer, with four jubilant hoots, swung round and shoved her sharp nose against the incoming tide.