LITMIR.BIZ

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get you out of the way of any other boats first. You don't mind going over and then back?"

      Verplanck looked at Craig. "On the contrary," muttered Craig, as he made fast the welcome line.

      The Carter dock was some three miles from the club on the other side of the bay. As we came up to it, Carter shut off his engine, bent over it a moment, made fast, and left us with a hurried, "Wait here."

      Suddenly, overhead, we heard a peculiar whirring noise that seemed to vibrate through the air. Something huge, black, monster-like, slid down a board runway into the water, traveled a few feet, in white suds and spray, rose in the darkness--and was gone!

      As the thing disappeared, I thought I could hear a mocking laugh flung back at us.

      "What is it?" I asked, straining my eyes at what had seemed for an instant like a great flying fish with finny tail and huge fins at the sides and above.

      "'Aquaero,'" quoted Kennedy quickly. "Don't you understand--a hydroaeroplane--a flying boat. There are hundreds of privately owned flying boats now wherever there is navigable water. That was the secret of Carter's boathouse, of the light we saw in the air."

      "But this Aquaero--who is he?" persisted McNeill. "Carter-- Wickham--Australia Mac?"

      We looked at each other blankly. No one said a word. We were captured, just as effectively as if we were ironed in a dungeon. There were the black water, the distant lights, which at any other time I should have said would have been beautiful.

      Kennedy had sprung into Carter's boat.

      "The deuce," he exclaimed. "He's put her out of business."

      Verplanck, chagrined, had been going over his own engine feverishly. "Do you see that?" he asked suddenly, holding up in the light of a lantern a little nut which he had picked out of the complicated machinery. "It never belonged to this engine. Some one placed it there, knowing it would work its way into a vital part with the vibration."

      Who was the person, the only one who could have done it? The answer was on my lips, but I repressed it. Mrs. Verplanck herself had been bending over the engine when last I saw her. All at once it flashed over me that she knew more about the phantom bandit than she had admitted. Yet what possible object could she have had in putting the Streamline out of commission?

      My mind was working rapidly, piecing together the fragmentary facts. The remark of Kennedy, long before, instantly assumed new significance. What were the possibilities of blackmail in the right sort of evidence? The yeggman had been after what was more valuable than jewels--letters! Whose? Suddenly I saw the situation. Carter had not been robbed at all. He was in league with the robber. That much was a blind to divert suspicion. He was a lawyer--some one's lawyer. I recalled the message about letters and evidence, and as I did so there came to mind a picture of Carter and the woman he had been dancing with. In return for his inside information about the jewels of the wealthy homes of Bluffwood, the yeggman was to get something of interest and importance to his client.

      The situation called for instant action. Yet what could we do, marooned on the other side of the bay?

      From the Club dock a long finger of light swept out into the night, plainly enough near the dock, but diffused and disclosing nothing in the distance. Armand had trained it down the bay in the direction we had taken, but by the time the beam reached us it was so weak that it was lost.

      Craig had leaped up on the Carter dock and was capping and uncapping with the brass cover the package which contained the triple mirror.

      Still in the distance I could see the wide path of light, aimed toward us, but of no avail.

      "What are you doing?" I asked.

      "Using the triple mirror to signal to Armand. It is something better than wireless. Wireless requires heavy and complicated apparatus. This is portable, heatless, almost weightless, a source of light depending for its power on another source of light at a great distance."

      I wondered how Armand could ever detect its feeble ray.

      "Even in the case of a rolling ship," Kennedy continued, alternately covering and uncovering the mirror, "the beam of light which this mirror reflects always goes back, unerring, to its source. It would do so from an aeroplane, so high in the air that it could not be located. The returning beam is invisible to anyone not immediately in the path of the ray, and the ray always goes to the observer. It is simply a matter of pure mathematics practically applied. The angle of incidence equals the angle of reflection. There is not a variation of a foot in two miles."

      "What message are you sending him?" asked Verplanck.

      "To tell Mrs. Hollingsworth to hurry home immediately," Kennedy replied, still flashing the letters according to his code.

      "Mrs. Hollingsworth?" repeated Verplanck, looking up.

      "Yes. This hydroaeroplane yeggman is after something besides jewels to-night. Were those letters that were stolen from you the only ones you had in the safe?"

      Verplanck looked up quickly. "Yes, yes. Of course."

      "You had none from a woman--"

      "No," he almost shouted. Of a sudden it seemed to dawn on him what Kennedy was driving at--the robbery of his own house with no loss except of a packet of letters on business, followed by the attempt on Mrs. Hollingsworth. "Do you think I'd keep dynamite, even in the safe?"

      To hide his confusion he had turned and was bending again over the engine.

      "How is it?" asked Kennedy, his signaling over.

      "Able to run on four cylinders and one propeller," replied Verplanck.

      "Then let's try her. Watch the engine. I'll take the wheel."

      Limping along, the engine skipping and missing, the once peerless Streamline started back across the bay. Instead of heading toward the club, Kennedy pointed her bow somewhere between that and Verplanck's.

      "I wish Armand would get busy," he remarked, after glancing now and then in the direction of the club. "What can be the matter?"

      "What do you mean?" I asked.

      There came the boom as if of a gun far away in the direction in which he was looking, then another.

      "Oh, there it is. Good fellow. I suppose he had to deliver my message to Mrs. Hollingsworth himself first."

      From every quarter showed huge balls of fire, rising from the sea, as it were, with a brilliantly luminous flame.

      "What is it?" I asked, somewhat startled.

      "A German invention for use at night against torpedo and aeroplane attacks. From that mortar Armand has shot half a dozen bombs of phosphide of calcium which are hurled far into the darkness. They are so constructed that they float after a short plunge and are ignited on contact by the action of the salt water itself."

      It was a beautiful pyrotechnic display, lighting up the shore and hills of the bay as if by an unearthly flare.

      "There's that thing now!" exclaimed Kennedy.

      In the glow we could see a peculiar, birdlike figure flying through the air over toward the Hollingsworth house. It was the hydroaeroplane.

      Out from the little stretch of lawn under the accentuated shadow of the trees, she streaked into the air, swaying from side to side as the pilot operated the stabilizers on the ends of the planes to counteract the puffs of wind off the land.

      How could she ever be stopped?

      The Streamline, halting and limping, though she was, had almost crossed the bay before the light bombs had been fired by Armand. Every moment brought the flying boat nearer.

      She swerved. Evidently the pilot had seen us at last and realized who we were. I was so engrossed watching the thing that I had not noticed that Kennedy had given the wheel to Verplanck and was standing in the bow, endeavoring to sight what looked like a huge gun.

      In rapid succession half a dozen shots rang out. I fancied I could almost hear

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