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honor.”

      And the answer came:

      “Satisfied—mailing—details—tonight—will—communicate—tomorrow—noon.”

      The attenuated thread which had linked them with the unknown was broken. Somewhere off through space they had talked with a man whom human ingenuity had failed to find—’twas another of the many miracles of modern science.

      The morrow brought a typewritten letter incapable of misconstruction. It was the usual thing—an open field, some thirty miles out of the city, a lone tree in the center of the field, a suit case containing the money to be left there. The letter concluded with a paragraph after this fashion:

      Your prince’s life depends upon rigid adherence to these instructions. If there is any attempt to watch, or to identify us, or molest us, a pistol shot will end the affair; if the bag is there, and the money is in the bag, he will be aboard ship within five hours. Remember, we hold your pledge!

      “Crude,” commented The Thinking Machine. “I was led to expect better things of them.”

      “But the money, man, the money?” exclaimed Baron Von Hartzfeldt. “It will be absolutely impossible to get it unless—unless we call upon the royal treasury.”

      His face was haggard, his eyes inflamed by lack of sleep, and deep furrows lined his usually placid brow. He leaned forward, and stared tensely into the pallid, wizened face of the scientist, who sat with head tilted back, his gaze turned steadily upward, his slender fingers precisely tip to tip.

      “Five million dollars in gold,” The Thinking Machine observed ambiguously, “would weight tons. It would take five hundred ten-thousand-dollar notes to make five million dollars, and I doubt if there are that many in existence. It would take five thousand thousand-dollar notes. Absurd! There will have to be two, perhaps three, of the bags.”

      “But don’t you understand,” Baron Von Hartzfeldt burst out violently, “that it’s impossible to raise that sum? That there will be none of the bags? That some other scheme—”

      “Oh, yes, there will be three of the bags,” The Thinking Machine asserted mildly. “But, of course, there will be no money in them!”

      Admiral Hasuen–Aubier and the diplomatist digested the statement in silence.

      “But you have pledged my word of honor—” the old sailorman objected.

      “Not to prosecute,” the scientist pointed out.

      “Absurd!” The ambassador came to his feet. “You have said we are not dealing with children. Why put the empty bags there? If they find they are empty, the prince’s life will pay forfeit; if we attempt to surround them and capture them, the result will be the same; and, besides, we will have broken our pledge.”

      “I’ve never seen any one so fussy about their pledges as you gentlemen are,” observed The Thinking Machine acridly. “Don’t worry. I shall not break a pledge; I shall not attempt to surround them and capture them; I shall not, nor shall any one representing me, or any of us, for that matter, be within miles of that particular field after the bags are placed. They shall reach the field unmolested and unwatched.”

      “You are talking in riddles,” declared the diplomatist impatiently. “What do you mean?”

      “I mean merely that the men who go to get the bags of money will wait right there until I come, even if it should happen to take two weeks,” was the enigmatic response. “Also, I’ll say they’ll be glad to see me when I get there, and glad to restore Prince Otto Ludwig to his ship without one penny being paid. There will be no prosecution.”

      “But—but I don’t understand,” stammered the ambassador.

      “I don’t expect you to,” said The Thinking Machine ungraciously. “Nor do I expect you to understand this.”

      Impatiently he spread a newspaper before the two men, and indicated an advertisement in black-faced type. It was on the first page, directly beneath a bulletin announcing a sudden change for the better in Prince Otto Ludwig’s condition. The admiral read it aloud blankly:

      “Wireless is only means communication can not be traced. Use it. Safe for all. Communicate with ship immediately. Would advise you erect private station.”

      That was all of it. It was addressed to no one, and signed by no one; if it had any meaning at all, it was merely as a curious method of advertising wireless telegraphy. Inquiringly at last the baron and the admiral raised their eyes to those of The Thinking Machine.

      “The abductors of Prince Otto Ludwig had not communicated with the ship,” he explained tersely, “because they could devise no way they considered absolutely safe. They knew the secret service would be at work. They didn’t dare to telegraph in the usual way, nor send a messenger, nor even a letter. Our secret service is an able organization; they understood it was not to be trifled with. All these things considered, I didn’t believe the abductors could hit upon a plan of communication which they considered safe. I inserted that advertisement in all the newspapers. It was a suggestion. They understood, and followed it. You will remember their first communication.”

      Baron Von Hartzfeldt came to his feet suddenly, then sat down again. The miracle hadn’t been a miracle, after all. It was merely common sense.

      “Jeder verruckte konnte davon denken!” exclaimed the admiral bluntly.

      “Quite right,” assented The Thinking Machine. “Any fool could have thought of that—but no other fool did!”

      Promptly at noon the wireless operator plucked this from the void:

      “Is—letter—satisfactory?”

      And the scientist dictated an answer:

      “Yes—except—we—require—another—day—to—raise—money.”

      “Granted—”

      “Impossible—put—all—money—one—bag—will—use—three.”

      “Satisfactory—remember—our—warning.”

      “You—have—our—pledge.”

      As the last word of the message went hurtling off into space, The Thinking Machine scrambled down the sea ladder and was rowed ashore. From his own home, half an hour later, he called Hutchinson Hatch on the telephone.

      “I want,” he said, “three large suit cases, one pair of extra-heavy rubber gloves, ten miles of electric wire well insulated, three Edison transformers, one fast automobile, permission to tap the Abington trolley wire, and two dozen ham sandwiches.”

      Hatch laughed. He was accustomed to the eccentricities of this little man of science.

      “You shall have them,” he promised.

      “Bring everything to my house at midnight.”

      “Right!”

      Looking back upon it later, Hatch decided he had never worked so hard in his life as he did that night; in addition to which he had the satisfaction of not knowing just what he was doing. There were telephone poles to be climbed, and shallow trenches to be dug and immediately filled in so no trace of their existence remained, and miles of electric wire to be hauled through thickly weeded fields. Dawn was breaking when everything seemed to be done.

      “This,” remarked The Thinking Machine, “is where the ham sandwiches are useful.”

      They breakfasted upon them, after which The Thinking Machine went away, leaving Hatch to watch the small dial of some sort of an indicator attached to a wire. At noon the scientist returned, and, without a word, took the reporter’s place at the dial. At thirty-three minutes past four the hand of the indicator suddenly shot around to one side, and the scientist arose.

      “We

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