My destination lay some thirteen hundred miles southeast of Great New York. I could do a good normal three-ninety in this fleet little Wasp, especially if I kept in the rarer air-pressures over the zero-height.

The thousand-foot lane had a southward drift, this night. I was making now well over four hundred; I would reach Nareda soon after midnight.

The Continental Shelf slid beneath me, dropping away as my course took me further from the Highland borders. The Lowlands lay patched with inky shadows and splashes of moonlight. Domes with upstanding, rounded heads; plateaus of naked black rock, ten thousand feet below the zero-height; trenches, like valleys, ridged and pitted, naked in places like a pockmarked lunar landscape. Or again, a pall of black mist would shroud it all, dark curtain of sluggish cloud with moonlight tinging its edges pallid green.

To my left, eastward toward the great basin of the mid-Atlantic Lowlands, there was always a steady downward slope. To the right, it came up over the continental shelf to the Highlands of the United States.

There was often water to be seen in these Lowlands. A spring-fed lake far down in a caldron pit, spilling into a trench; low-lying, land-locked little seas; canons, some of them dry, others filled with tumultuous flowing water. Or great gashes with water sluggishly flowing, or standing with a heavy slime, and a pall of uprising vapor in the heat of the night.

At 37N. and 70W., I pa.s.sed over the newly named Atlas Sea. A lake of water here, more than a hundred miles in extent. Its surface lay fifteen thousand feet below the zero-height; its depth in places was a full three thousand. It was clear of mist to-night. The moonlight shimmered on its rippled surface, like pictures my father had often shown me of the former oceans.

I pa.s.sed, a little later, well to the westward of the verdured mountain top of the Bermudas.

There was nothing of this flight novel to me. I had frequently flown over the Lowlands; I had descended into them many times. But never upon such a mission as was taking me there now.

I was headed for Nareda, capital village of the tiny Lowland Republic of Nareda, which only five years ago came into national being as a protectorate of the United States. Its territory lies just north of the mountain Highlands of Haiti, Santo Domingo and Porto Rico. A few hundred miles of tumbled Lowlands, embracing the turgid Nares Sea, whose bottom is the lowest point of all the Western Hemisphere--some thirty thousand feet below the zero-height.

The village of Nareda is far down indeed. I had never been there. My charts showed it on the southern border of the Nares Sea, at minus twenty thousand feet, with the Mona Valley behind it like a gash in the steep upward slopes to the Highlands of Porto Rico and Haiti.

Nareda has a mixed population of typical Lowland adventures, among which the hardy Dutch predominate; and Holland and the United States have combined their influence in the World Court to give it national ident.i.ty.

And out of this had arisen my mission now. Mercury--the quicksilver of commerce--so recently come to tremendous value through its universal use in the new antiseptics which bid fair to check all human disease--was being produced in Nareda. The import duty into the United States was being paid openly enough. But nevertheless Hanley"s agents believed that smuggling was taking place.

It was to investigate this condition that Hanley was sending me. I had introduction to the Nareda government officials. I was to consult with Hanley by ether-phone in seeking the hidden source of the contraband quicksilver, but, in the main, to use my own judgment.

A mission of diplomacy. I had no mind to pry openly among the people of these Lowland depths, looking for smugglers. I might, indeed, find them too unexpectedly! Over-curious strangers are not welcomed by the Lowlanders. Many have gone into the depths and have never returned....

I was above the Nares Sea, by midnight. I was still flying a thousand feet over the zero-height. Twenty-one thousand feet below me lay the black expanse of water. The moon had climbed well toward the zenith, now. Its silver shafts penetrated the hanging mist-stratas. The surface of the Nares Sea was visible--dark and sullen looking.

I shifted the angles of incidence of the wings, re-set my propeller angles and made the necessary carburetor adjustments, switching on the supercharger which would supply air at normal zero-height pressure to the carburetors throughout my descent.

I swung over Nareda. The lights of the little village, far down, dwarfed by distance, showed like bleary, winking eyes through the mists. The jagged recesses of the Mona valley were dark with shadow. The Nares Sea lay like some black monster asleep, and slowly, heavily panting.

Moonlight was over me, with stars and fleecy white clouds. Calm, placid, atmospheric night was up here. But beneath, it all seemed so mysterious, fantastic, sinister.

My heart was pounding as I put the Wasp into a spiral and forced my way down.

CHAPTER II

_The Face at the Window_

With heavy, sluggish engines I panted down and came to rest in the dull yellow glow of the field lights. A new world here. The field was flat, caked ooze, cracked and hardened. It sloped upward from the sh.o.r.e toward where, a quarter of a mile away, I could see the dull lights of the settlement, blurred by the gathered night vapors.

The field operator shut off his permission signal and came forward. He was a squat, heavy-set fellow in wide trousers and soiled white shirt flung open at his thick throat. The sweat streamed from his forehead.

This oppressive heat! I had discarded my flying garb in the descent. I wore a shirt, knee-length pants, with hose and wide-soled shoes of the newly fashioned Lowland design. What few weapons I dared carry were carefully concealed. No alien could enter Nareda bearing anything resembling a lethal weapon.

My wide, thick-soled shoes did not look suspicious for one who planned much walking on the caked Lowland ooze. But those fat soles were cleverly fashioned to hide a long, keen knife-blade, like a dirk. I could lift a foot and get the knife out of its hidden compartment with fair speed. This I had in one shoe.

In the other, was the small mechanism of a radio safety recorder and image finder, with its attendant individual audiophone transmitter and receiver. A miracle of smallness, these tiny contrivances. With batteries, wires and grids, the whole device could lay in the palm of one"s hand. Once past this field inspection I would rig it for use under my shirt, strapped around my chest. And I had some colored magnesium flares.

The field operator came panting.

"Who are you?"

"Philip Grant. From Great New York." I showed him my name etched on my forearm. He and his fellows searched me, but I got by.

"You have no doc.u.ments?"

"No."

My letter to the President of Nareda was written with invisible ink upon the fabric of my shirt. If he had heated it to a temperature of 180F.

or so, and blown the fumes of hydrochloric acid upon it, the writing would have come out plain enough.

I said, "You"ll house and care for my machine?"

They would care for it. They told me the price--swindlingly exorbitant for the unwary traveller who might wander down here.

"All correct," I said cheerfully. "And half that much more for you and your men if you give me good service. Where can I have a room and meals?"

"Sp.a.w.n," said the operator. "He is the best. Fat-bellied from his own good cooking. Take him there, Hugo."

I had a gold coin instantly ready; and with a few additional directions regarding my flyer, I started off.

It had been hot and oppressive standing in the field; it was infinitely worse climbing the mud-slope into the village; but my carrier, trudging in advance of me along the dark, winding path up the slope, shouldered my bag and seemed not to notice the effort. We pa.s.sed occasional tube-lights strung on poles. They illumined the heavy rounded crags. A tumbled region, this slope which once was the ocean floor twenty thousand feet below the surface. Rifts were here like gulleys; little b.u.t.tes reared their rounded, dome heads. And there were caves and crevices in which deep sea fish once had lurked.

For ten minutes or so we climbed. It was past the midnight hour; the village was asleep. We entered its outposts. The houses were small structures of clay. In the gloom they looked like drab little beehives set in unplanned groups, with paths for streets wandering between them.

Then we came to a more prosperous neighborhood. The street widened and straightened. The clay houses, still with rounded dome like tops, stood back from the road, with wooden front fences, and gardens and shrubbery.

The windows and doors were like round finger-holes plugged in the clay by a giant hand. Occasionally the windows, dimly lighted, stared like sleeping giant eyes.

There were flowers in all the more pretentious private gardens. Their perfume, hanging in the heavy night air, lay on the village, making one forget the over-curtain of stenching mist. Down by the sh.o.r.e of the Nares Sea, this world of the depths had seemed darkly sinister. But in the village now, I felt it less ominous. The scent of the flowers, the street lined in one place by arching giant fronds drowsing and nodding overhead--there seemed a strange exotic romance to it. The sultry air might almost have been sensuous.

"Much further, Hugo?"

"No. We are here."

He turned abruptly into a gateway, led me through a garden and to the doorway of a large, rambling, one-story building. The news of my coming had preceded me. A front room was lighted; my host was waiting.

Hugo set down my bag, accepted another gold coin; and with a queer sidelong smile, the incentive for which I had not the slightest idea, he vanished. I fronted my host, this Jacob Sp.a.w.n. Strange fate that should have led me to Sp.a.w.n! And to little Jetta!

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