Friday broke the tense silence in the control cabin. "He's _got_ to be _somewhere_!" he exploded. "It isn't natural for the screen not to show nothin'! Isn't there somethin' we can do?"

The Hawk was surprisingly patient. "I'm afraid not," he said. "It's invisibility he's using, or else the fourth dimension, as Judd said. But we've got one good chance. He'll send more instructions by radio, and surely, after that, his ship will appear----"

A new voice, bland and unctuous, spoke in the control cabin from behind the three men.

"_Not necessarily, my honored friend Ca.r.s.e_," it said. "_You will observe there is no need for a ship to appear._"

Ku Sui had come.

CHAPTER III

_The Wave of a Handkerchief_

He stood smiling in the door-frame leading aft to the rear entrance port. There was all grace in his posture, in the easy angle at which one arm rested against the side bulkhead, in the casual way in which he held the ray-gun that bored straight at Ca.r.s.e. Height and strength he had, and a perfectly proportioned figure. Beauty, too, of face, with skin of clearest saffron, soft, sensitive mouth and ascetic cheeks. His hair was fine and black, and swept straightly back from the high narrow forehead where lived his tremendous intelligence.

It was his eyes that gave him away, his eyes of rare green that from a distance looked black. Slanting, veiled, unreadable beneath the lowered silky lashes, there was the soul of a tiger in their sinister depths. It was his eyes that his victims remembered....

"So you have arrived, Dr. Ku," whispered Hawk Ca.r.s.e, and for a second he too smiled, with eyes as bleak and hard as frosty chilled steel. Their glances met and held--the cold, hard, honest rapier; the subtle perfumed poison. The other men in the cabin were forgotten; the feeling was between these two. Strikingly contrasted they stood there: Ca.r.s.e, in rough blue denim trousers, faded work-shirt, open at the neck, old-fashioned rubber shoes and battered skipper's cap askew on his flaxen hair; Ku Sui, suavely impeccable in high-collared green silk blouse, full-length trousers of the same material, and red slippers, to match the wide sash which revealed the slender lines of his waist. A perfume hung about the man, the indescribable odor of tsin-tsin flowers from the humid jungles of Venus.

"You see I meet you halfway, my friend," the Eurasian said with delicate mock courtesy. "A surpa.s.sing pleasure I have antic.i.p.ated for a long time. _No, no!_ I see that already I shall have to ask you a small favor. A thousand pardons: it's my deplorable ability to read your mind that requires me to ask it. Your so justly famed speed on the draw might possibly overcome this advantage"--he raised his ray-gun slightly--"and, though I know you would not kill me--save in the direst emergency, since you wish to take me a living prisoner--I would find it most distressing to have to carry for the rest of my life a flaw on my body. So, may I request you to withdraw your ray-guns with two fingertips and put them on the floor? Observe--your fingertips. Will you be so kind?"

The Hawk looked at him for a minute. Then silently he obeyed. He knew that the Eurasian would have no compunctions about shooting him down in cold blood; but, on the other hand, even as the man had said, he could not kill Ku Sui, but had to capture him, in order to take him to Earth to confess to crimes now blamed on Eliot Leithgow. "Do as he says, Friday," he instructed the still staring negro; and, like a man in a trance, Friday obeyed.

"Thank you," the Eurasian said. "It was a most friendly thing to do." He paused. "I suppose you are wondering how I arrived here, and why you did not see me come. Well, I shall certainly tell you, in return for your favor. But first--ah, friend Ca.r.s.e--your gesture! A reminder, I a.s.sume."

Slowly the Hawk was stroking the bangs of hair which had been trained to obscure his forehead. There was no emotion on his chilly face as he answered, no slightest sign of feeling unless it were a slight trembling of the left eyelid--significant enough to those who could read it.

"Yes," he whispered, "a reminder. I do not like to wear my hair like this, Ku Sui, and I want you to know that I've not forgotten; that, though I'm now in your power, there'll be a day----"

"But you wouldn't threaten your host!" the other said with mock surprise. "And surely you wouldn't threaten me, of all men. Must I point out how useless it has always been for you to match yourself, merely a skilful gunman, against me, against a brain?"

"Usually," the cold whisper came back, "the brain has failed in the traps it has laid for the gunman."

"Only because of the mistakes of its agents. Unfortunately for you, the brain is dealing with you directly this time, my friend. It's quite a different matter. But this small talk--although you honor----"

"Of course you intend to kill me," said the Hawk. "But when?"

Dr. Ku gestured deprecatingly. "You insist on introducing these unpleasant topics! But to relieve your mind, I've not yet decided how I can entertain you most suitably. I have come primarily to ask you one trifling thing."

"And that is?"

"The whereabouts of Master Scientist Eliot Leithgow."

Hawk Ca.r.s.e smiled. "Your conceit lends you an extraordinary optimism, Dr. Ku."

"Not unfounded, I am sure. I desire very much to meet our old friend Leithgow again: his is the only other brain in this universe at all comparable to mine. And did I tell you that I always get what I desire?

Well, will you give me this information? Of course, there are ways...."

For a moment he waited.

The Hawk only looked at him.

"Always in character," the Eurasian said regretfully. "Very well." He turned his head and took in Friday and Sako, standing near-by. "You are Sako?" he asked the latter. "It is most unfortunate that you had to deceive me a little while ago. We shall have to see what to do about it.

Later. For the present, move farther back, out of the way. So. You, black one, next to my friend Ca.r.s.e: we must be moving along. So."

Ku Sui surveyed then with inscrutable eyes. Gracefully, he drew close.

Ca.r.s.e missed not a move. He watched the Eurasian draw, from one of the long sleeves of his blouse, a square of l.u.s.trous black silk.

"This bears my personal insignia, you see," he murmured. "You will remember it." And he languidly waved it just under their eyes.

Friday stared at it; Ca.r.s.e too, wonderingly. He saw embroidered in yellow on the black a familiar insignia composed of an asteroid in the circle of ten planets. And then alarm lit his brain and he grimaced.

There was a strange odor in his nostrils and it came from the square of silk.

"Characteristic, Dr. Ku," he said. "Quite characteristic."

The Eurasian smiled. An expression of stupid amazement came over Friday's face. The design of asteroid and planets wavered into a blur as the Hawk fought unconsciousness; a short, harsh sound came from his lips; he lurched uncertainly. The negro crumpled up and stretched out on the deck. Ca.r.s.e's desire to sleep grew overpowering. Once more, as from a distance, he glimpsed Ku Sui's smile. He tried to back to the wall; made it; then a heavy thump suggested to his dimming mind that he had collapsed to the deck. He was asleep at once....

CHAPTER IV

_Soil_

Hawk Ca.r.s.e awoke with a slight feeling of nausea, and the smell of the drug faint in his nostrils. He found he was lying on the floor of a large, square cell whose walls and ceiling were of some burnished brown metal and which was bare of any kind of furnishing. In one wall was a tightly closed door, also of metal and studded by the k.n.o.b of a lock.

Barred slits, high in opposite walls, gave ventilation; a single tube set in the ceiling provided illumination.

He was not bound. He sat up and regarded the outflung figure of Friday, lying to one side. "Something in his look seemed to reach the giant negro, for, as he watched, the man's eyelids flickered, and a sigh escaped his full lips. He stared up at Ca.r.s.e, recognition, followed by gladness, flooding his eyes. The Hawk smiled also. There were close bonds between these two.

"Lord, I'm sure thankful to be with you, suh!" said the negro with relief. His eyes rolled as he took in the cabinlike cell. "Hmff--nice homey little place," he remarked. "Where do you reckon we are, suh?"

"I think we're at last at that place we have searched so long for--Ku Sui's headquarters, his own s.p.a.ceship."

It will be remembered by those who have read their history that the Eurasian's actual base of operations was for a long time the greatest of the mysteries that enveloped him. Half a dozen times had the Hawk and his comrade in arms, Eliot Leithgow, hunted for it with all their separate skill of adventurer and scientist, and, although they had twice found the man himself, always they had failed to find his actual retreat.

For those who are unacquainted with the histories of that raw period a hundred years ago, it will be impossible to understand the spell of fear which accompanied mention of Dr. Ku throughout the universe--a fear engendered chiefly by the man's unpredictable comings and goings, thanks to his secret hiding place. Those who were as close to him as henchmen could be--which was not very close--only added to the general mystery of the whereabouts of the base by their sincerely offered but utterly contradictory notions and data. One thing all agreed on: the outlaw's lair was a place most frightening.

Therefore it can be understood why, on hearing the Hawk's opinion, Friday's face fell somewhat.