The next day Storri received from the San Reve a ground-plan of the Treasury Building. It exhibited in red ink the vault that held the gold reserve. Storri gazed upon that oblong smudge of red and studied its location with the devotion of a poet.

And now what was to be more expected than that the curious Czar would ask questions of Storri, when that illustrious Russian returned to St. Petersburg, concerning those many superiorities which the American buildings possessed? The thought set the indefatigable Storri to visiting the public buildings. He made a tour of the State War and Navy Building, the Corcoran Gallery, the Capitol, and finally the Treasury Building. Who should escort him through that latter grim, gray edifice but an Assistant Secretary? The affable A. S. had met Storri at the club; certainly he could do no less than give him the polite credit of his countenance for his instructive rambles. Under such distinguished patronage Storri went from roof to basement; even the vault that guarded the nation's gold was thrown open for his regard.

This gold vault was of particular moment to Storri; his Czar had laid weight upon that vault. Yes; he, Storri, could see how it was constructed—thick walls of masonry—an inner lining of chilled steel that would laugh at drills and almost break the teeth of nitric acid—the steel ceiling and sides bolted to the masonry—the floor, steel slabs two feet in width, laid side by side but not bolted, and bedded upon masonry that rested on the ground! Surely, nothing could be more solid or more secure! The door and the complicated machinery that locked it were wonders, marvels! Nowhere had he, Storri, beheld such a door or such a lock, and he had peeped into the strong rooms of a dozen kings. The gold, too, one hundred and ninety-three millions in all, packed five thousand dollars to a sack in little canvas sacks like bags of birdshot, and each sack weighing twenty pounds—Storri saw it all!

"And yet," quoth Storri, giving the polite Assistant Secretary a kind of leer, "do not that door and lock remind you of the chains and locks upon your leathern letterbags?—a leathern bag which the most ignorant of men would slash wide open with a penknife in an instant and never worry chains and locks?"

Storri traced that drain in its course to the river. It ran south past the corner of the Treasury Building for the matter of a hundred yards or more, and then broke south and west across the White Lot between the White House and the Monument. In the end it abandoned this diagonal flight and soberly took to the center of a street that lay to the west of the White House, and followed it to the Potomac.

Storri, hands in pocket and puffing an easy cigar, sauntered to the water front and took a look at the drain where it finished. The inspection gratified him; the drain was like a great tunnel; one might have driven a horse and wagon into it. Storri was especially struck by the fact that a considerable stream of water gushed from the drain's mouth; the stream had a fair current, four miles an hour at least, and showed a depth of full six inches. This was a discovery that set Storri's wits in motion; the drain boxed in a living brook.

It was eleven o'clock that night when Storri returned to the mouth of the drain; he was wrapped in a greatcoat and wore high boots. There were no houses about; as for loiterers, the region was deserted after dark. Storri looked out on the broad bosom of the river; he noticed that even at low tide a boat drawing no more than eighteen inches might push within a dozen feet of the drain.

Satisfied that no one observed him, Storri stepped to the mouth of the drain and disappeared. He splashed along in the running water with his heavy boots for something like a rod; then he stopped and lighted a bicycle lantern which he took from his greatcoat pocket. The lantern threw a bright flare after the manner of the headlight of a locomotive, and Storri could hear the scurrying splash of the rats as it sent an alarming ray ahead like a little searchlight. Being lighted on his way, Storri kept steadily forward until, turning the corner where the drain broke to the right across the White Lot, he was lost to sight.

As Storri disappeared, two men far behind him at the mouth of the drain stood watching. They had thus far followed Storri dimly with their eyes by the light he carried.

"What's become of him, Inspector?" whispered Mr. Duff, the shorter of the men. "He hasn't doused his glim, has he?"