A hurried message to the Holland Agency brought four plain clothes men from the private reserve, under the leadership of superintendent Cleary. Monty met them at the doorway of the club house, wearing a rough and tumble suit.

They sped downtown, toward the East River, the criminologist on the seat where he could direct the driver. At Twenty-sixth Street, near the docks, they dismounted and Shirley gave his directions to the detectives.

“I want you to slide along these doorways, working yourselves separately down the water front until you are opposite the yacht club landing. I will work on an independent line. You must get busy when I shoot, yell or whistle,—I can't tell which. As the popular song goes, 'You're here and I'm here, so what do we care?' This is a chance for the Holland Agency to get a great story in the papers for saving young Van Cleft from the kidnappers.”

He left them at the corner, and crossing to the other pavement, began to stagger aimlessly down the street, looking for all the world like a longshoreman returning home from a bacchanalian celebration from some nearby Snug Harbor. It was a familiar type of pedestrian in this neighborhood at this time of the morning.

“That guy's a cool one, Mike,” said Cleary to one of his men. “These college ginks ain't so bad at that when you get to know 'em with their dress-suits off.”

“He's a reg'lar feller, that's all,” was Mike's philosophical response. “Edjication couldn't kill it in 'im.”

A hundred yards offshore was the beautiful steam yacht of the Van Clefts', the “White Swan.” Lights on the deck and a few glowing portholes showed unusual activity aboard. Shirley's hint to Warren about the contemplated trip to southern climes was the exact truth. Naked truth, he had found, was ofttimes a more valuable artifice than Munchausen artistry of the most consummate craft! The longshoreman, apparently befuddled in his bearings, wandered toward the dock, which protruded into the river, a part of the club property. He staggered, tumbled and lay prostrate on the snowy planks.

Then he crawled awkwardly toward one of the big spiles at the side of the structure, where he passed into a profound slumber. This, too, was a conventional procedure for the neighborhood! A man walked across the street, from the darkness of a deserted hallway: he gave the somnolent one a kick. The longshoreman grunted, rolled over, and continued to snore obliviously.

An automobile honk-honked up Twenty-third Street, and then swung around in a swift curve toward the dock. The investigating kicker slunk away, down the street. The limousine drew up at the entrance to the tender gangway. Accompanied by a portly servant, a young man in a fur coat, stepped from the machine.

“Give them another call with your horn, Sam,” he directed. “The boat will be in for me, then.”

This was done. A scraping noise came from the hanging stairway of the dock, and a voice called up from the darkness: “Here we are, sir!” Howard Van Cleft leaned over the edge and looked down, somewhat nervously. A reassuring word came up from the boat, rocking against the spiles.

“You was a bit late, sir. You said three, Mr. Van Cleft, and now it's ten after. So the captain sent us in to wait for you. Everything's shipshape, sir, steam up, and all the supplies aboard. Climb right down the ladder, sir. Steady now, lads!”

This seemed to presage good. Van Cleft turned to his butler.

“Take down the luggage, Edward. Goodbye, Sam. Keep an eye on the machines. The folks will attend to everything for you while I am away. Good-bye.”

The butler had delivered the baggage and now returned up the ladder, puffing with his exertions.

“Good-bye, sir,” and his voice was more emotional than usual. “Watch yourself, sir, if you please, sir. You're the last Van Cleft, and we need you, sir.” The old man touched his hat, and climbed into the automobile, as Van Cleft climbed down the ladder. The machine sped away under the skilful guidance of Sam.

“Steady, sir, steady—There, we have you now, sir,—Quick, men! Up the river with the tide. Row like hell!—Keep your oars muffled—here comes the other boat.”

All this seemed naturally the accompaniment of the embarkment of Van Cleft's yachting cruise, but the sleeping longshoreman suddenly arose to his feet and blew a shrill police whistle. Next instant the flash of his pocket-lamp illumined the dark boat below him. A volley of curses greeted this untoward action! A revolver barked from the hand of a big man in the stern. Young Van Cleft lay face downward in the boat, neatly gagged and bound. As the light still flickered over the surprised oarsmen, an answering shot evidenced better aim. The man in the back of the bobbing vessel groaned as he fell forward upon the prostrate body of the pinioned millionaire. One oarsman disappeared over the side of the boat, to glide into the unfathomable darkness, with skilful strokes.

“Hold still! I'll kill the first man who makes a move!”

As Shirley's voice rang out, Cleary with his assistants was dashing across the open space to the end of the dock.

“Shove out that boat-hook and hold onto the dock!” was the additional order, accompanied by a punctuation mark in the form of another bullet which splintered the gunwale of the boat. Looking as they were, into the dazzling eye of the bulb light, the men were uncertain of the number of their assailants: surrender was natural. Cleary's men made quick work of them. The boat from the yacht now hove to by this time, filled with excited and profane sailormen. The skipper of the “White Swan,” revolver drawn, stood in its bow as it bumped against the stairway. Howard Van Cleft was unbound: dazed but happy he tried to talk.

“What—why—who?” he mumbled.

“Pat Cleary, from the Holland Detective Agency,” was Shirley's response. “There, handcuff these men quick. Two cops are coming. We want the credit of this job before the rookies beat us to it.”

Van Cleft recognized the speaker, and caught his hand fervently. Shirley, though, was too busy for gratitude. He gave another quick direction.

“Hurry on board your yacht tender and get underway. Your life isn't worth a penny if you stay in town another hour. These men will be attended to. Good luck and goodbye.”

The young man rapidly transferred his luggage to his own boat. They were soon out of view on their way to the larger vessel. Shirley turned toward Cleary.

“I'll file the charge against these two men. They tried to rob me and make their getaway in this boat. You were down here as a bodyguard for Van Cleft, who, of course, knew nothing about the matter as he left for his cruise. So his name can be kept out of it entirely. And the fact that you helped to save him from paying fifty thousand dollars in blackmail, will not injure the size of Captain Cronin's bill. Get me?”

“It's got!” laughed Cleary.

Two patrolmen were dumfounded when they reached the spot to find four men in handcuffs in charge of six armed guardians. The superintendent explained the situation as laid out by Shirley. The cavalcade took its way to the East Twenty-first Street Police Station, where the complaint was filed. Sullen and perplexed about their failure, the men were all locked in their cells, after their leader had his shoulder dressed by an interne summoned from the nearby Bellevue Hospital.

Shirley and Cleary returned with the others to the waiting automobile, after these formalities. The prisoners had been given the customary opportunity to telephone to friends, but strangely enough did not avail themselves of it.

“We're cutting down the ranks of the enemy, Cleary,” observed the detective as he lit a cigarette. “But I wonder who it was that escaped in the water?”

“He'll be next in the net. But say, Mr. Shirley, what percentage do you get for all this work, I'm awondering?” was the answering query. The criminologist laughed.

“Thanks, my dear man, simply thanks. That's a rare thing for a well-to-do man to get since the I.W.W. proved to the world that it's a crime for a man to own more than ten dollars, or even to earn it! But I wish you would drop me off about half a block from the Somerset Apartments, on Fifty-sixth Street. I want to watch for a late arrival.”

He waited in the shadows of the houses on the opposite side of the street. After half an hour he was rewarded by the sight of Mr. Shine Taylor dismounting from a taxicab. The young gentleman wore a heavy overcoat over a bedraggled suit. One of his snowy spats was missing; his hat was dripping, still, from its early immersion. He entered the building, after a cautious survey of the deserted street, with a stiff and exhausted gait.

Shirley was satisfied with this new knot in the string. He returned to his rooms at the club, to gain fresh strength for the trailing on the morrow. And this time, he felt that he deserved his rest!

Next morning, after his usual plunge and rub-down, he ordered breakfast in his rooms. He instructed the clerk to send up a Remwood typewriter, and began his experiments with the code of the diary.

From an old note-book, in which were tabulated the order of letter recurrences according to their frequency in ordinary English words, he freshened his memory. This was the natural sequence, in direct ratio to the use of the letters: “E: T: A: O: N: I: S: B: M, etc.” The use of “E” was double that of any other. Yet on the pages of the book he found that the most frequently recurring symbol was “R” which was, ordinarily, one of the least used in the alphabet. “T,” which would have been second in popularity, naturally, was seen only a few times in proportion. “Y,” also seldom used, appeared very often. The symbol “A” was used with surprising frequency.

“Let me see,” he mused. “This code is strictly typewritten. It must be arranged on some mechanical twist of the typing method. A is used so many times that it might be safe to assume that it is used for a space, as all the words in this code run together. If A is used that way, what takes its place? S would by rights be seventh on the list, but the average I have made shows that it is about third or fourth.”

Carefully he jotted down in separate columns on a piece of paper the individual repetitions of letters on the page of “January 7, 1915.” He arrived at the conclusion, then, that “R” was used for “E,” that “S” took the place of “A” and that “Y” alternated in this cipher for “T” which was second on his little list.

Fur the benefit of the reader who may be interested enough to work out this little problem, along the lines of Shirley's deductions the arrangement of the so-called “Standard” keyboard is here shown, as it was on the “Number Four” machine of Warren's Remwood, and the duplicate machine which Shirley was using.

This diagram represents the “lower case” or small letters, capitals being made by holding down one of the shift keys on either side, and striking the other letter at the same time, there being two symbols on each metal type key. As only small letters were used through the code Shirley did not bother about the capitals. He realized at last, that if his theory of substitution were correct the writer had struck the key to the right of the three frequent letters. He had the inception of the scheme.

Starting with the first line of the sentences so jumbled on the page for January 7, 1915, he began to reverse the operation, copying it off, hitting on the typewriter the keyboard letter to the left of the one indicated in the order of the cipher.

The result was gratifying. He continued for several lines, having trouble only with the letter “P.” At last he realized that the only substitution for that could be “Q.” In other words, “A” had been used for the space letter throughout, and for all the other symbols the one on the right had been struck, except “P” which being at the end of the line had been merely swung to the first letter on the other end of it!

No wonder Warren had been so confident of its baffling simplicity! Many of the well-known rules for reading codes would not work with this one, and had it not been for Shirley's suspicion, aroused in the library of the arch-schemer the night before, he would hardly have given the typewriter, as a mechanical aide, a second thought. Warren's desire to drop the subject of machines had planted a dangerous seed.

Laboriously Shirley typed off the material of the entire page for the fatal Thursday, and his elation knew no bounds as he realized that here was a key to many of the activities of his enemy. He donned his hat and coat and hurried over to the Hotel California to show his discovery to Helene. She invited him up to her suite at once, where he wasted no words but exhibited the triumphant result of his efforts. He handed her his own transcription, and this is what she read:

“January 7, 1915, Thursday.

“learned from bank de cleyster drew six thousand in morning monk assigned to taxi work for tea shine assigned to fix generator margie fairfax date with de cleyster at five, shine and joe hawley covering game jake and ben assigned black car for me paid phil one hundred covering special work job finished riverside drive at eighty third sharp deposited night and day four thousand safe deposit fifteen hundred lent dolly marion two hundred for dress for party with van cleft next afternoon advanced shine one thousand to cover option of yacht sunbeam paid to broker that night ordered provisions telephone for yacht two month cruise monk assigned for job next day advanced shine five hundred on account work on wellington serral matter repairs black machine fifty party apartment same night champagne one hundred fifty caterer one hundred tips fifty five to janitor taxis twelve must stir phil up on work for grimsby matter memorandum arrange for yacht mooring on east river instead of north after wednesday eighth job finis memorandum settle telephone exchange proceeds not later than monday paid electrician special wiring two hundred in full settlement.”

“There, Miss Helene, how do you like my little game of letter building?”

There was a boyish gleam of triumph in his smile as he turned toward her.

“You are a wizard, but how did you work it all out?” There was no smile in her face, only a mingled horror at the revelations of this calculating monster in his businesslike murder work, and an unfeigned admiration for Shirley's keenness.

“A very old method, but one which would have availed for naught without your help. The letter paper which you used and the unmistakable identity of Warren's machine are two more bars of iron with which to imprison him. The paper of that note is the same on which they wrote to Van Ceft for money, and their threats to me. This shows from a microscopic examination of its texture. I will give the whole book to a trustworthy stenographer: more than six months of these little confessions are tabulated here. Warren was evidently so used to this code that he could write in it as easily as I do with the straight alphabet. His training in German universities developed a thoroughness, a methodical recording of every thing, which is apt to cost him dearly. And his undoubted vanity prompted him to have a little volume of his own in that library to which he could turn occasionally for the retrospection of his own cleverness. Now, I must investigate this clever telephone system. I think I have the clue necessary.”

He intrusted the book to Helene for the morning, promising to return in an hour or two with new information, drolly refusing to tell her his destination.

“You're a bad, bold boy, and should be spanked, for not letting some one know where to look for you in case you get into difficulties,” she pouted. “Perhaps I will do some equally foolish thing myself.”

“If you knew how you frightened me yesterday!” he began.

“Did you really worry and really care?” But Shirley had slipped out of the door, leaving her to wonder, and then begin that long delayed letter to Jack.