Newland nodded. "I understand that much. Go ahead."

"Well," Troy said, "whatever that first Earth survey ship had to report

about the Cassa system looked good enough so that the administration

put Cassa down for a major expedition some day. Twenty years later, we

got here again--the interstellar exploration carrier _Atlas_ with eight

hundred men on board. I'm one of her engineers. And we found the

Tareegs--that's what the Hammerheads call themselves--waiting for us.

Not another bunch of scientists and assistants but a war-party. They'd

learned enough from the two survey ship men they'd caught to figure out

we'd be coming back and how to handle us when we got here.

"Now get straight on a few things about the Hammerheads, Jerry. Their

weapons systems are as good or better than ours. In other ways,

they're behind us. They've got a fair interstellar drive but can't make

the same use of it we do, because they've still a lot to learn about

inertial shielding. They have a couple of robot-directed interstellar

drones standing in a hangar a few hundred yards from here which can hit

half the speed of your courier, but no Hammerhead or human being could

ride 'em up and live. The two big carriers that brought them to Cassa

One are dead-slow boats compared to the _Atlas_. And that's about the

best they have at present.

"Just the same, they're out to get us. War is the best part of living

as far as they're concerned, and they're plenty good at it. So far

they've only been fighting among themselves but they're itching for a

chance at another race, and now we're it. Capturing an Earth expedition

in the Cassa System was only part of the plan to take Earth by

surprise."

Newland blinked, said slowly, "How's that? You'd think that might tip

their hand. We'll be missed, won't we?"

"Sure we'll be missed," Troy said. "But when? We were to stay here

eight years ... don't remember that either, eh? The Hammerheads will

have all the time they need to be set for whoever comes looking for us

eventually."

"But would they know that?"

Troy said bitterly, "They know everything about Earth that our top

brass scientists of the Cassa Expedition were able to tell them.

Pearson and Andrews--those names mean anything? They were the

Expedition Chiefs when we were captured. One of the first things the

Hammerheads did was to have the science staff and other department

heads look on while they tortured those two men to death. As a result,

they've had all the cooperation they could ask for--more than any

decent human being would think of giving them--from our present

leadership, the senior scientists Dr. Chris Dexter and Dr. Victor

Clingman. They're a couple of lousy traitors, Jerry, and I'm not sure

they're even capable of realizing it. Clingman's in charge here at the

ground base, and he acts as if he doesn't see anything wrong in helping

the Hammerheads."

"Helping the...." Vacancy showed for a moment in the pilot's

expression; he frowned uncertainly.

* * * * *

"Try to stay awake, Jerry! There're just a few other things you should

try to get nailed down in your memory this time. The Hammerheads are

water animals. They can waddle around on land as long as they keep

themselves moist, but they don't like it. They've got a religion based

on a universal struggle between water and land. Cassa One's nothing but

hot desert and rock and big salt beds, so it's no good to them. And the

other two planets in the system have no oxygen to speak of.

"Now here's the thing that's hard to swallow. There's a huge lumped-up

asteroid swarm in the system. The _Atlas_ stopped for a few days on

the way in to look around in it. Dexter and Clingman, after we'd been

captured, volunteered the information to the Hammerheads that a lot of

that stuff was solid H_{2}O and that if they wanted Cassa One fixed up

the way they'd like it--wet--the _Atlas_ could ferry enough asteroid

ice over here in billion-ton loads to turn most of the surface of the

planet into a sea.

"You understand it wasn't the Hammerheads who had the idea. They don't

have anything resembling the ship power and equipment to handle such a

job; it hadn't even occurred to them that it could be possible. But you

can bet they bought it when it was handed to them. It will give them a

base a third of the way between their own system and Sol. That's what's

been going on since we landed and were grabbed off ... almost three

years ago now.

"And these last weeks there've been, for the first time since we got

here, a few clouds in the sky. It means the boys on the _Atlas_ have

as many of those mountains of ice riding on orbit as are needed, and

they've started shoving them down into the atmosphere to break up and

melt. So we ... Jerry, wake up!"

Troy Gordon paused, watching Newland, then shrugged, stood up and

went over to take the butt of the cigarette from the pilot's slack

fingers. Newland had slid back into catatonic immobility; he offered no

resistance as Troy swung his legs up on the bunk and straightened him

out on his back.

How much would he remember the next time he awoke? Troy didn't know; he

had no medical experience and was working on the basis of remembered

scraps of information about the treatment given men recovering from an

experience such as Newland's. There were people on the ground station

who could have told him what to do, but he hadn't dared ask questions.

It was chiefly a matter of time now. Or of lack of time. What would

happen when the giant hauling operation was concluded, when the water

which had been carried in from space came creeping across the vast

desert plateaus about the station, was something he didn't know. But

it was almost certain that if his own plans hadn't been carried out by

that time, they never would be.

* * * * *

"Jerry," he addressed the sleeping pilot softly, "if you've wondered

why I'm risking my neck to bring you back to life and keep you hidden

away from the Hammerheads and Clingman, it's because you're the one

man I still can trust in this lousy expeditionary group. It's because

you tried to do something about the situation on your own. You don't

remember it yet, but when the Hammerheads took over the _Atlas_ you

made a break for it in the courier boat. You tried to get away and warn

Earth. They shot you down before you could clear atmosphere; but then

they couldn't find the wreck. They thought it was down in one of the

salt beds and gave up looking for it.

"But I found it in the desert a couple of months later. You'd dropped

through into the emergency tank and you were still more or less alive.

I smuggled the tank into the station here as soon as I'd rigged up a

place where I could keep it. I can use some help, and you'll be the

best possible man for the job...."

He stopped, surprised to see that Newland's mouth had begun to work

awkwardly as if he were trying to speak. Then a few words came, slow

and slurred, but indicating that the pilot's mind had not sunk nearly

as far from full wakefulness as during his previous relapses.

"Wha ... want me ... do?"

Troy didn't answer. Not yet, he thought. Not until Newland was no

longer helpless. Because, in spite of all precautions, he might be

discovered here at any hour; and if that should happen, Troy's secret

must still be his own. He could act without Newland's help if necessary.

He waited a few seconds longer, while the pilot's face slowly smoothed

out again into comatose blankness. Then Troy turned around quietly and

left the room.

* * * * *

Troy Gordon's personal living quarters were on the lowest of the

station's three underground levels, behind the central power plant and

utilities section. Considerable privacy was their only attraction; and

since the arrangement kept Troy, during his off-duty hours, close to

his responsibilities as the station's maintenance engineer, neither Dr.

Clingman nor the Hammerheads had objected to it. He was a useful man;

and to the useful, minor privileges could be extended.

Troy had been able to take advantage of that circumstance. The room

in which Newland was hidden lay behind his own quarters, forming an

extension to them. The entrance to it was concealed, and while a

careful search should have disclosed it, Troy--so far as he knew--had

as yet given no one a reason to initiate such a search. The back room

was not part of the station's original design; he had cut it secretly

out of the rock. With the equipment at his disposal, it had been a

relatively minor job.

But it involved a very ugly risk. Discovery would have meant death, and

no easy one. With the exception of the cooperating chief scientists,

the Hammerheads' attitude towards their captives was largely one of

watchful indifference, so long as no one got out of line. But they

had taken one measure which insured that, after a short time, there

was very little inclination left among the prisoners to get out of

line knowingly. At intervals of about a month, whether or not an overt

offense had been committed, one more member of Earth's Cassa Expedition

was methodically tortured to death by the aliens; and a group of his

fellows, selected apparently at random, was obliged to witness the

matter while fastened to a device which allowed them to experience the

victim's sensations in modified form.

Troy had been included twice in the observing group. He hadn't known

whether it implied a personal warning or not. In the Hammerheads' eyes,

he was a useful servant; it might be that he was also a suspected

one. Nevertheless, it had been necessary to construct the back room.

One day, he was returning through the desert from one of the outlying

automatic stations under his care when he caught the momentary whisper

of a distress signal in his groundcar's receiver. The slight sound had

put his hair on end. It was an Earth signal, on an Earth band; and

with the _Atlas_ off-planet it could have only one possible source. In

seconds, it wavered out and was lost, but Troy already had established

the direction.

* * * * *

A week passed before he had the opportunity to obtain a second fix;

then, hours later, he was standing beside the wreck of the courier

ship. It had plunged into a deep cleft in the rocks and was now half

covered by sand; it began to seem less of a miracle that the Hammerhead

fliers had not found it. Troy shut off the quavering signal projector,

discovered next that the emergency tank had a living occupant, but

left Newland where he was while he hurriedly examined the rest of the

ship. The courier was hopelessly damaged, but before Troy concluded

the examination, his plan against the Hammerheads had been born, at

least as a possibility. It took more than two and a half years then to

convert the possibility into an operation which seemed at last to have

something better than a fighting chance to succeed. For, of course,

Troy had told no one of the discovery. A few words might have gained

him eager helpers, but might also have reached a man paralyzed by

the fear of torture to the extent that he would reveal everything to

safeguard himself.

Troy left his rooms, locking the outer door behind him. Moving thirty

feet down the narrow steel-floored passage behind the power plant,

he entered one of the tool rooms, again closing and locking the door

as he went through. It had been a much more difficult and lengthy

undertaking to drill a tunnel from the station's lowest level up to the

force-screened Hammerhead hangar outside than to carve an additional

room out of the rock, but it had been completed months before. The

tunnel's hidden station entrance was beneath the tool room floor, the

other opening out of the polished rock base of the hangar twenty feet

from one of the interstellar drones. The most careful human scrutiny

would hardly have read any significance there into the hairline crack

which formed an irregular oval on the rock; and since Troy hadn't been

found out, he could assume that the Hammerheads' powers of observation

were no more acute.

It had been night in the surrounding desert for some hours by now,

but the hangar was brightly lit--a very unusual occurrence at such a

time. Troy paused, momentarily disconcerted, studying the scene in the

hangar through the vision screen installed in the tunnel just below the

exit. If the Hammerheads--there were only Hammerheads--present--were

initiating some major new activity in the next day or two, his plans

might be, if not ruined, at least very dangerously delayed. He counted

over a hundred of the creatures, mostly assembled near the far end of

the hangar in three orderly groups. A few officers stood together,

somewhat closer to him.

Troy chewed his lip anxiously, the moisture-conserving suits they wore

for outside duty on Cassa One, which concealed the two sets of swim

flippers along their sides and left the top pair of upper limbs ...

short, sturdy brown arms with hands larger than human hands, quite

as capable and rather unpleasantly human in appearance ... free for

use. The transparent, inverted-triangle helmets were clamped down. As

he looked on, one of their big atmospheric personnel carriers came

gliding into sight behind the immobile ranks. There were commands, and

the Tareegs turned and filed into the vehicle, moving with the rapid,

awkward little waddle which was their method of progress on land. A

minute or two later, the loaded carrier moved out of the hangar, and

the lights in the vast structure slowly faded away.

* * * * *

Where were they going? They were carrying the usual weapons, but this

was not some dryland drill. Troy could not remember seeing so large a

group leave the station before. The uneasy conviction returned that

the move must be connected with the fact that clouds had begun to show

in Cassa One's skies, that the mile-thick boulders of ice which had

been brought across space already were falling through the atmosphere

of the desiccated world.

One or two more undisturbed days, Troy thought. In that time it would

become clear whether Newland was going to recover sufficiently to be

able to play a part in his plans. Only two sections of the shattered

courier ship, the inertial shielding and the autonav, had been needed

to transform the Hammerheads' interstellar drone twenty feet from the

tunnel exit into a spaceship which men could ride and direct. Both

those sections had been repairable, and everything else Troy had been

able to steal or build in the station. Month after month passed as

he brought it all together in the tunnel, familiarized himself with

every necessary detail of the drones' mechanisms and fitted in the

new installations ... first in theory, then in actual fact. A part

of almost every night was spent in the darkened hangar, assembling,

checking and testing one section or another, then disassembling

everything and taking it back down into the tunnel before the moment

came when the Tareeg watch-beams would sweep again through the hangar.

The beam-search was repeated each three hours and twenty-seven minutes

throughout the night. Within that period of time, Troy would have to

carry out a final complete assembly, let the drone roar into life and

send it flashing up through the force-screen and into space.

By now, he knew he could do it. And if he had calculated the drone's

capacity correctly, he would then be less than six months from Earth.

The Hammerheads had nothing they could send after him.

But once in space, he needed Newland's experience. Everything else

would be on board to get them to Earth, but without a trained pilot the

probability of arriving only on autonav was something Troy couldn't

calculate. With a great deal of luck, he thought, it still should

be possible. Newland's skills, on the other hand, would give them

something considerably better than an even chance.

But Newland would have to be recovered first. He was still under the

ministrations of the emergency tank, embedded now in the wall of the

back room beyond the bunk. The tank had to stay there; no amount of

planning had shown a way it could be fitted into the drone besides

everything else; there simply was no room left for it. And what Troy

had learned made it clear that if he lifted into space with Newland

before the pilot's behavior was very nearly normal, he would have a

half-dead zombie on his hands before the trip was well begun.

That had been his reason for waiting. But the question was now whether

he mightn't already have waited a little too long....

* * * * *

Troy checked his watch. Take a chance and begin the final installation

at once? It would be an hour before the search-beams came back. The

interior of the ships was inspected at irregular periods; he hadn't

been able to establish any pattern for that. But to leave his equipment

in place in the drone for one day, or two at the most, might not be

stretching his luck too far. Then, if Newland shaped up, there would be

that much less delay in leaving, that much less time to spend in the

Tareeg hangar finishing the job at the end. And no one could tell what

new developments the next few days might bring, or how much time they

would find that they had left....

He twisted the direction dials on the vision screen, swinging it slowly

once more about the darkened hangar. Then he unlocked and shifted the

exit switch, and the irregularly carved section of rock above him moved

on its lifting rods out of the hangar floor. Troy swung up and out

behind it, got to his feet and started over to the drone.

There was a thin, burring noise close to his ear.

Troy stopped in mid-stride, his face tight and wary. The noise meant

that his room communicator was being called. Probably some minor

technical emergency on the station, but.... He counted off twenty

seconds, then turned on the relay mike under his coat collar. Trying to

make his voice thick with drowsiness, he said, "Gordon speaking. Who's

it?"

"Reese," a carefully uninflected voice told him from the speaker. "Dr.

Clingman wants you to come up to his office immediately, Gordon."

Troy felt a sudden sharp prickling of fear.

"At this time of night?" he demanded petulantly. "It's the middle of my

sleep period! What's gone wrong now?"

"I wouldn't know," Reese said. "Our senior scientist"--he made the two

words sound like a worn, habitual curse--"didn't go into details."

* * * * *

Dr. Victor Clingman was a large, untidy man inclined to plumpness,

with stringy blond hair and protuberant pale eyes. His office adjoined

that of the Tareeg station commandant--a Low Dsala, in Hammerhead

terms--and it was permeated from there with a slightly salty, vaguely

perfumed moistness. Rank had its privileges; only the Low Dsala enjoyed

the luxury of keeping his station work quarters damp enough to make

the wearing of a suit unnecessary. The other Hammerheads waddled about

the cold, dry halls completely covered, breathing through humidifiers,

and were only occasionally permitted, and then after much ceremony, to

enter an area in their section called the Water Room and linger there

for several hours.

Troy came into Clingman's office with his tool kit through the double

doors designed to prevent moisture from escaping, shivering slightly as

the sudden clamminess touched his skin. Clingman, engaged as usual in

pecking out something on a writer, shirt sleeves rolled up on his plump

arms, ranked piles of notes on the table beside him, turned a pale,

unhealthy-looking face towards the door.

"Mister Gordon," he said mildly, dragging the "mister" out a little as

was his habit. He nodded at the wall to Troy's left. "Our recording

mechanisms became inoperative again ... and just as I was in the

process of noting down some very interesting fresh clues as to the

probable origin of the Tareeg coup system. Will you try to attend to

it?"

"Right away," Troy said, his vague fears dispelled. Clingman's

recorders were a standard problem; the repair parts for such items were

on the _Atlas_ which had not come down into atmosphere for almost a

year. There probably had been no reason to feel apprehensive about a

night call to the office. It had happened on such occasions before.

* * * * *

He went to work, glancing over from time to time at the senior

scientist who was frowning down pensively at the writer. Before the

Hammerheads executed his predecessors, Dr. Victor Clingman had been

head of the Biology Department on the Cassa Expedition, and his

interest in the subject had not changed, though it was now centered

exclusively on the life habits of their captors. The Tareegs did not

seem to object to his preoccupation with them. Possibly it amused them;

though Clingman had told Troy once, rather complacently, that his

research already had proved to be of some usefulness to the Tareegs in

answering certain questions they had had about themselves. That might

also be true. On several occasions, at any rate, Troy had found either

the Low Dsala or another Hammerhead officer in Clingman's office,

answering the scientist's questions in high-pitched, reedy voices

which always had the suggestion of a whistle in them. All of them

apparently had been taught human speech, though they rarely chose to

use it.

Clingman cleared his throat, asked without turning his head, "Did

I tell you, Gordon, that the Tareegs' known history goes back to

considerably less than a thousand years, by human time reckoning?"

"Yes, you did, doctor," Troy said. It had become almost impossible for

him to do work for Clingman--and Clingman invariably called on him

personally when he had some mechanical chore on hand--without listening

to a lengthy, rambling discourse on the scientist's latest discoveries

about the Tareegs. It was an indication, he thought, that Clingman had

grown increasingly hungry for human companionship of any kind. He could

hardly fail to know that the majority of the station's human component

was aware he had originated the suggestion made by the leading

scientific group to the Hammerheads concerning the possibility of

turning Cassa One into a Tareeg water world, and that he was generally

despised for it. Troy's noncommittal attitude might have led him to

believe that Troy either had not been informed of the fact or happened

to be a man who saw nothing very objectionable in such an act.

Troy was, as it happened, less certain than some of the others that

Clingman and the men like Dr. Chris Dexter, who had been directing

the ice-hauling operations of the _Atlas_, had come to a deliberate,

cold-blooded agreement among themselves to save their own skins by

offering to help the Hammerheads against mankind. It was perhaps more

likely that they had acted in unthinking panic, following the gruesome

executions the Hammerheads had forced them to witness. That would be

more forgivable, if only slightly so. It was difficult to be sure about

Clingman in any way. He might be unpardonably guilty in his own mind

and still no less frightened than before--for who knew, after all, what

the Tareegs ultimately intended with their prisoners? On the other

hand, he might actually have buried all such considerations beneath the

absorbed, objective interest he appeared to take in them.

* * * * *

Troy had paid no more attention than he could help at first to

Clingman's scholarly monologues on his favorite theme. His own thoughts

avoided the Hammerheads as far as possible. But as his personal plans

began to develop and the chance that he might reach Earth grew into

something more than a wildly improbable hope, he realized that the

more he learned about the new enemy, the more valuable an eventual

report would be. Thereafter he listened carefully, memorizing all

of Clingman's speculations, and gradually developed some degree of

detached interest of his own in the creatures. They had a curious

history, short though it was, a history of merciless strife on twin

water worlds of the same system in which any records of a common

background had been long lost or destroyed. Then had come the shock of

mutual discovery and renewed battling, now on an interplanetary scale,

which ended in a truce of carefully guarded equality between the rival

worlds.

"That situation, it seems possible," Clingman had said once, "may

have led to the legend of the lost home-world of the Tareegs." It was

a cautious reference to the obvious fact that neither Tareeg planet

would have been willing to admit that it might be no more than an

ancient colony of its twin. A remote and glorious ancestral world which

had brought both colonies forth as equals was a much more acceptable

theory. "And yet," Clingman went on, "the legend might well be based in

fact. And it may be that we, with our skills, will enable the Tareegs

to rediscover that world...."

It sounded, Troy had thought, with something like amused disgust, as if

the scientific brass had prudently worked out a new scheme to preserve

itself after the Cassa One operation closed out.

"There also, of course," Clingman continued, blinking his pale eyes

reflectively at Troy, "we have the origin of the parallel legend of

the Terrible Enemy. What except the conquest of the home-world by a

monstrous foe could have caused it to forget its colonies? In that

light, it becomes a little easier to understand the ... ah, well ...

the ... cautious distrust the Tareegs have shown towards the first

intelligent species they encountered in interstellar space."

And _that_ sounded like an attempted apology--not so much for the

Tareegs and their manner of expressing cautious distrust as for Dr.

Victor Clingman's collaboration with them. But Troy said nothing. By

then he was very eager to hear more.

He did. Almost week by week, something new was added to the Hammerhead

data filed away in his mind. Much of it might be unimportant detail,

but Earth's strategists could decide that for themselves. The Tareeg

coup system Clingman was mulling over again tonight had been of

significance at least to the prisoners; for it probably was the reason

the majority of them were still alive. The two High Dsalas who, each

representing one of the twin worlds, were in joint command of the

Tareeg forces here would have gained great honor merely by returning to

their system at once with the captured Earth expedition. But to have

stayed instead, silently to have assumed personal responsibility for

the creation of a new world fit for Tareeg use--_that_ assured them

honor and power beyond belief when the giant task was over and the

announcement went out....

* * * * *

The awareness that Clingman was speaking again broke into Troy's

thoughts.

"Almost everything they do," the scientist observed musingly, "is

filled with profound ceremonial meaning. It was a long while before we

really understood that. You've heard, I suppose, that cloud formations

have appeared on this side of the planet?"

Troy was about to answer, then checked himself, frowning down at the

cleanly severed end of the lead he had been tracing. Severed? What....

"Gordon?"

"Uh ... why, yes, I've seen them myself, doctor." Troy's mind began to

race. The lead had been deliberately cut, no question of that. But why?

He might have spent another hour checking over the recording equipment

before discovering it--

"It means, of course," he heard Clingman saying, "that the dry sea

basins of Cassa One gradually are filling with water. Now, we know the

vital importance to the Tareegs of being able to immerse themselves in

the--to them--sacred fluid, and how severely they have been rationed in

that respect here. One might have thought that, from the High Dsalas

down, all of them would have plunged eagerly into the first bodies of

water to appear on the planet. But, no ... so great a thing must not be

approached in that manner! A day was set, months in advance, when it

could be calculated that the water level would reach a certain point.

At that hour, every Tareeg who can be spared from essential duty will

be standing at the shore of the new sea. And together...."

Abruptly, the meaning of Clingman's words faded out of Troy's mind.

The sudden nighttime summons to Clingman's office--had it been no

accident after all? Had he done something in the past few hours to

arouse suspicion, and was he being detained here now while his rooms

were searched? Troy felt sweat start out on his face. Should he say

anything? He hesitated, then reached quietly into the tool kit.

"... and only then"--Clingman's voice returned suddenly to his

consciousness--"will the word be prepared to go back, and the messenger

ships filled with the sacred water so that it can be blended at the

same moment with the twin worlds' oceans, to show that Cassa One has

become jointly a part of each...."

Messenger ships--the interstellar drones, of course. And the big troop

of Hammerheads which had been taken from the station in the personnel

carrier less than an hour ago.... His hands trembling a little, Troy

quickly closed the recorder, picked up the tool kit.

Clingman checked himself. "Oh ... you've finished, Gordon?" He sounded

startled.

Troy managed to work a grin on his face. "Yes, doctor. Just a broken

lead. And now, if you'll excuse me...." He started to turn away.

"Ah, one moment!" Clingman said sharply. "There was ... I ... now

where...." He gazed about the table, pushing fretfully at the piles

of notes. "Oh, yes! Dr. Rojas ... Room 72. You were on your way up

here when he attempted to reach you. Something that needed ... well, I

forget now what he said. Would you mind going over there immediately?"

"Not at all." Troy's heart was pounding. If there had been any doubt

he was being deliberately delayed, it would have vanished now. Dr.

Rojas, of course, _would_ have something waiting that "needed" Troy's

attention before he got to Room 72. A call from Clingman would arrange

for it.

But if they were suspicious of him, why hadn't he been placed under

arrest? They don't want to scare me off, Troy thought. They're not

sure, and if I'm up to something they don't want to scare me off before

they know just what it is....

* * * * *

He'd swung around to the hall, mind reaching ahead through the next

few minutes, outlining quickly the immediate steps he would have to

take--and so he was almost past the Hammerhead before he saw it. The

door to the Low Dsala's offices had opened quietly, and the Low Dsala

stood there five feet away, the horizontally stalked eyes fixed on Troy.

Troy started involuntarily. He might be very close to death now. To

approach a Hammerhead ... let alone the station's ranking officer ...

unbidden within a dozen steps was a dangerous thing for a prisoner to

do. The Dsala's left hand hung beside the ornament-encrusted bolt-gun

all the officers carried--and those broad torturers' hands could move

with flashing speed. But the creature remained immobile. Troy averted

his eyes from it, keeping his face expressionless, walked on with

carefully unhurried steps, conscious of the Dsala's stare following him.

It was one of the comparatively few times he had seen a Hammerhead

without its suit. If one knew nothing about them, they would have

looked almost comical--there was a decided resemblance to the penguins,

the clown-birds of Earth, in the rotund, muscular bodies and the double

set of swimming flippers. The odd head with its thick protruding

eyelobes and the small, constantly moving crimson triangle of the

mouth were less funny, as were the dark, human-shaped hands. Troy felt

a chill on his back when he heard the Dsala break into sudden speech

behind him: a high, quick gabble in its own language. Was it expressing

anger? Drawing the door quietly shut, he heard Clingman begin to reply

in the same tongue.

* * * * *

Reese looked briefly up from the intercom desk as Troy stopped before

it. "Finished with Clingman?" he asked.

"Uh-huh," Troy said. "Any other little jobs waiting before I can get

back to sleep?"

"Not so far," Reese told him sourly. "Pleasant dreams." He returned his

attention to the panels before him.

So Dr. Rojas, as had seemed almost certain, had put in no call for him.

But if he didn't show up at Room 72, how long before they began to

wonder where he was? Perhaps four or five minutes....

Troy stepped out of the elevator on the maintenance level forty

seconds after leaving Reese, went quickly on into the engine room.

One Hammerhead guard stood watching him from the far end. As a rule,

three of them were stationed here. They were accustomed to Troy's

appearances, and he had been careful to establish as irregular a

pattern as was practicable in attending to routine chores, so that in

an emergency his motions would draw a minimum of attention. Ignoring

the guard now, he carried out a desultory inspection of a set of wall

controls, paused four times to remove four minor sections of machinery

and drop them into his tool kit, and was leaving the big room again a

minute and a half later.

Out in the passage, he re-opened the kit, quickly snapped three of the

small steel parts together. The carrying of firearms naturally was

not a privilege the Tareegs extended to human beings; but the newly

assembled device was a quite functional gun. Troy thumbed three dozen

hand-made shells out of the fourth piece removed from the control

equipment, loaded the gun and shoved it into his pocket.

The door to his quarters was locked, and there were no immediate

signs inside that an inspection might have been carried out during

his absence. Troy moved over to the rarely used intercom view-screen,

changed some settings behind it, and switched it on. The hidden back

room appeared in the screen, and--in spite of his near-certainty about

Clingman's purpose in detaining him--Troy felt his face whiten slowly

with shock.

Jerry Newland was no longer lying on his bunk, was nowhere in the room.

A gaping opening in the wall behind the bunk showed where the emergency

tank Troy had brought in from the crashed courier ship had been

installed. So they not only had the pilot in their hands--they already

were aware of his identity and of the condition he was in.

Troy felt a surge of physical sickness. Left to himself, Newland would

have died in the desert without regaining consciousness as the tank's

independent power source began to fail. Troy had saved him from that;

but very probably it was the Tareeg death the pilot faced now. Troy

switched off the screen, started back to the door, fighting down his

nausea. Self-blame was a luxury for which he had no time. He couldn't

help Newland, and there was not an instant to lose. Within a few

hours, he could still be in space and take his chances alone at getting

the warning to Earth.

But first the search for him must be directed away from the Tareeg

hangar. And that, very fortunately, was an action for which he had long

been thoroughly prepared....

* * * * *

The Hammerhead guard at the station's ground-level exit also had been

reduced to one soldier. And here the appearance of the maintenance

engineer's groundcar on its way to one of the automatic installations

out in the desert was as familiar an occurrence as Troy's irregular

inspection visits in the engine room. The guard watched him roll past

without moving and without indication of interest. Troy glanced at his

watch as the exit closed behind him. Not quite six minutes since he'd

left Clingman's office ... they should already have begun to check on

his whereabouts, and the fact that he alone of all the humans at the

station had access to a groundcar would then be one of the first things

to come to their minds.

He slowed the car near a tiny inspection door in the outer wall of the

station, cut its lights, jumped out and watched it roll on, picking

up speed as it swerved away to the east and rushed down into the

dark desert. Months before he had installed the automatic guidance

devices which would keep the car hurrying steadily eastwards now,

changing direction only to avoid impassable obstacles. It might be

that, at a time of such importance to the Tareegs, they would not

attempt to follow the car. If a flier did discover it from the air,

the vehicle would be destroyed ... and it was rigged to disintegrate

with sufficient violence then to conceal the fact that it had lacked a

driver.

* * * * *

Troy opened the inspection door, then stopped for a moment, staring

back at the Tareeg hangar beyond the station. Light had been glowing

through its screens again when he came out; now the hazy translucence

of the screens was drawing sideways and up from the great entrance

rectangle. Another of the big personnel carriers nosed slowly out,

moved up into the air and vanished against the night sky. If it was

loaded as close to capacity as the one he had watched from inside the

tunnel, almost two thirds of the Hammerhead force at the station had

gone by now to attend the rites at Cassa One's new sea.

He waited while the force-screen restored itself over the entrance.

Immediately afterwards, the lights in the hangar turned dim and faded

away. Troy climbed in through the inspection door, locked it and

started back down to the maintenance level.

With a little luck, he thought, he might even be able to work

undisturbed now inside the interstellar drone he had selected for his

escape. He would have to be back in the tunnel when the search-beams

came through again ... he suspected they might be quite sensitive

enough to detect the presence of a living being inside one of the

ships. But the Hammerheads themselves might not show up again until

he was prepared to leave. And then it wouldn't matter. If they did

appear--well, he would get some warning from the fact that the hangar

lights would begin to come on first. Not very much warning, but it

might be enough.

The passage leading past his quarters was empty and quiet. Troy

remained behind a corner for a minute or two listening. If Dr. Rojas

had reported his failure to arrive at Room 72, the Tareegs must also

have learned by now that he had left the station, and the last place

they would think of hunting for him was here. But somebody--Hammerhead

or human stooge--might be in his rooms, making a second and more

thorough investigation there.

* * * * *

Everything remained still. Troy came quietly out into the passage, went

down it to the tool room next to his quarters, opened the door, taking

the gun from his pocket, and slipped inside. With the door locked, he

stood still a moment, then turned on the lights.

A glance around showed that nobody was lurking for him here. He

darkened the room again, crossed it, removed the floor section over the

tunnel entrance and slipped down into the tunnel. Working by touch,

he pulled the floor section back across the opening, snapped it into

place and started up the familiar narrow passage he had cut through the

desert rock.

He couldn't have said exactly what warned him. It might have been the

tiny click of a black-light beam going on. But he knew suddenly that

something alive and breathing stood farther up the passage waiting for

him, and the gun came quickly from his pocket again.

His forehead was struck with almost paralyzing force. Stungun ... they

wanted him alive. Troy found himself on his knees, dizzy and sick,

while a voice yelled at him. _Human_, he thought, with a blaze of

hatred beyond anything he'd ever felt for the Tareegs. _Traitor human!_

The gun, still somehow in his hand, snarled its answer.

Then the stungun found him again, in three quick, hammering blows, and

consciousness was gone.

* * * * *

There came presently an extended period of foggy, groping thoughts

interspersed with sleep and vivid nightmares. After a time, Troy was

aware that he was in a section of the sick bay on the _Atlas_, and that

the great carrier was in interstellar flight. So the operation on Cassa

One was over.

He wondered how long he had been knocked out. Days perhaps. It was the

shrill, rapid-fire voice of a Tareeg which had first jolted him back

into partial awareness. For confused seconds, Troy thought the creature

was addressing him; then came the click of a speaker and the sounds

ended, and he realized he had heard the Tareeg's voice over the ship's

intercom system. A little later, it occurred to him that it had been

using its own language and therefore could not have been speaking to

him.

During that first muddled period, Troy knew now and then that he was

still almost completely paralyzed. Gradually, very gradually, his mind

began to clear and the intervals of sleep which always ended with

terrifying nightmares grew shorter. Simultaneously he found he was

acquiring a limited ability to move. And that, too, increased.

It might have been three or four hours after his first awakening

before he began to plan what he might do. He had made a number of

observations. There were three other men in this section with him. All

seemed to be unconscious. He thought the one lying in the bed next to

his own was Newland, but the room was dim and he had been careful to

avoid motions which might have been observed, so he wasn't certain.

There was a single human attendant in the small room beyond the open

doorspace opposite his bed. Troy didn't recall the man's face. He was

in the uniform of a medical corpsman; but whatever else the fellow

might be, he was here primarily in the role of a guard because he had

a gun fastened to his belt. It classed him as a human being whose

subservience to the Hammerheads was not in question. Twice, when the

man in the bed at the far end of the room had begun to groan and move

about, the guard came in and did something that left the restless one

quiet again. Troy couldn't see what he used, but the probability was

that it had been a drug administered with a hypodermic spray.

Getting his hands on the gun, Troy decided, shouldn't be too difficult

if he made no mistakes. His life was forfeit, and to lie and wait

until the Tareeg inquisitors were ready for him wasn't to his taste.

Neither ... though somewhat preferable ... was personal suicide. A

ship, even as great a ship as the _Atlas_, had certain vulnerabilities

in interstellar flight--and who knew them better than one of the ship's

own engineers? The prime nerve centers were the bridge and the sections

immediately surrounding it. It might be, Troy thought, it just might

be that the Hammerheads never would bring their prize in to the twin

worlds to have its treasures of technological information pried out of

it. And that in itself would be a major gain for Earth.

* * * * *

He turned various possibilities over in his mind with the detachment of

a man who has acknowledged the inevitable fact of his own death. And he

felt his strength flowing back into him.

The guard in the other room presently heard renewed groans and the

slurred muttering of a half-conscious man. As he came in through the

doorspace with the drug spray he walked into Troy's fist. It didn't

quite put him to sleep, but the spray did thirty seconds later, and

shortly he was resting, carefully bound and gagged since Troy didn't

know how long the drug would retain its effect, in the back of a large

clothes locker.

The man in the next bed was Newland. He seemed uninjured but was

unconscious, presumably drugged like the other two. Troy left the

section in the corpsman's uniform, the gun concealed in his pocket. It

was improbable that the guard's authority to carry it extended beyond

the sick bay area. In another pocket--it might come in handy--was the

refilled drug spray.

He was two decks closer to the bridge section when it struck him how

deserted the _Atlas_ seemed. Of course, he had avoided areas where he

would be likely to run into sizable groups of either men or Tareegs.

But he had seen only six humans so far, only two of the Hammerheads.

These last had come out of a cross-passage ahead of him and vanished

into another, two men following quietly behind, the high-pitched alien

voices continuing to make a thin, complaining clamor in the otherwise

empty hall seconds after they had disappeared. And the thought came to

Troy: suppose most of the ship's complement was down in the sleepers?

It wasn't impossible. The _Atlas_ must still be provisioned for years

to come, but an excellent way to avoid human mutiny on the approach

to the Hammerhead worlds would be to put any captives not needed for

essential duty to sleep. And the _Atlas_ hadn't been built for the

convenience of water-creatures. To control a human skeleton crew would

require a correspondingly small number of Tareegs. Most of their force,

he thought, very well might be making the return in their own vessels.

* * * * *

The reflection literally stopped Troy in his tracks. Because that could

change everything he'd had in mind, opened up possibilities he hadn't

thought existed ... including the one, still remote though it might be,

of returning the _Atlas_ to Earth. Perhaps the men now in charge of

the ship would be almost as unwilling to allow that to happen as the

Hammerheads; they had too much to answer for. But if the situation he

had imagined did exist, his thoughts raced on ... why then....

Troy's mind swam briefly with a wild premonition of triumph. There

_were_ ways in which it might be done! But because of that, there was

also now the sudden need for much more caution than he had intended to

use. What he needed first was somebody who could tell him exactly how

things stood on board--preferably somebody in a position of authority

who could be persuaded or forced to fall in then with Troy's subsequent

moves.

* * * * *

The bridge deck was as quiet as the others. On the old _Atlas_, most

of this area had been officers' country, reserved for the expedition

heads and top ship personnel; and presumably that arrangement had been

changed only by the addition of Tareeg commanders and guards. Troy kept

to the maintenance passages, encountered no one but presently found

unused crew quarters and exchanged the corpsman uniform there for less

conspicuous shipboard clothes. This would make a satisfactory temporary

base of operations. And now to get the information he wanted....

The voice was coming out of the only door open on the dim hall. There

were six staterooms on either side, and Troy remembered that the room

beyond the open door had been occupied by Dr. Clingman on the trip

out from Earth. The voice--preoccupied, mild, a little tired--was

unmistakably Dr. Victor Clingman's.

Was he alone? Troy thought so. He couldn't make out the words, but

it was a monologue, not a conversation. He had the impression of

Clingman dictating another rambling dissertation on Tareeg ways into

a recorder; and the conviction came to him, not for the first time,

that the man was in some essential manner no longer sane, that he had

come to believe that his observations on these deadly enemies some day

really could be compiled into an orderly and valuable addition to human

knowledge.

Sane or not, he was a frightened man, the perfect quarry for Troy's

present purpose. With a gun on him, he would talk. And once having

assisted Troy to any degree, he would be too terrified of Tareeg

reprisals to do anything but switch sides again and go along with Troy,

hoping that thereby the worst--once more--could be avoided. The worst

for Victor Clingman. It would be impossible, Troy thought, to trust

Clingman, but he could make very good use of him in spite of that.

He came quietly along the passage, his attention as much on the

closed doors about him as on the one which was open. The guard's gun

unfortunately wasn't a noiseless type, but he had wrapped a small

cushion around its muzzle and across it, which should muffle reports

satisfactorily if it came to that. Words became distinguishable.

"It is not a parasite in the ordinary sense," Clingman's tired voice

said. "It is a weapon. It kills and moves on. A biological weapon

limited to attack one species: the enemy. It is insidious. There is no

warning and no defense. Unconsciousness and death occur painlessly

within an hour after contact, and the victim has not realized he is

being destroyed. The radius of infection moves out indetectably and

with incredible swiftness. And yet there was a method of containing

this agent. That knowledge, however, is now lost.

"As an achievement of the Tareeg genius for warfare, the weapon seems

matched--in some respects surpassed--only by the one used to counteract

it. And in that, obviously, there were serious faults. They...."

The man, Troy decided, was quite close, perhaps twelve feet to the

right side of the door. He glanced back along the silent hall, slipped

the cover from the gun--with Clingman, he would only need to show

it--then came into the room in two quick strides, turning to the right

and drawing the door shut behind him.

* * * * *

There was no one in sight. The voice continued:

"... desperate, with no time to complete essential testing. A terrible

gamble, but one which inevitably...." The meaning faded from Troy's

mind as he discovered the wall-speaker from which the words were

coming. His eyes darted across the room to a comfortable chair drawn

up beside a table, to a familiar picture of untidily arrayed piles of

notes on the table, a thread of smoke still rising from a cigarette

in the tray among them. Clingman had been in the room within minutes,

listening to one of his previous recordings as he worked. Troy's glance

shifted to a closed door on his right. Bedroom and bath of the suite

lay behind it. Clingman might be there. He might also ... Troy reached

back, quietly opened the door to the hall again, moved on and slipped

out of sight behind an ornamental screen on the other side of the

speaker.

Clingman could have left his quarters for some reason. In any event, it

was obvious that he had intended to return to the room very shortly. If

he brought someone with him, the situation might be more difficult. But

hardly too difficult to be handled.

Troy worked the improvised silencer back over the gun muzzle, senses

straining to catch either the opening of the door on his right or the

sound of an approach down the hall.

"So it was possible," he heard the wall-speaker say, "to reconstruct,

in almost every essential detail, what the concluding situation must

have been on the world where the Tareeg species had its origin. The

attacking section was safely screened, presumably by a form of energy

barrier, against the deadly agent it had released. The section under

attack had no defense against an agent so nearly indestructible that it

subsequently survived for over a thousand years in its inert, frozen

condition without losing effectiveness in the least--"

Troy thought: What ... WHAT HAD IT SAID?

He stepped out from behind the screen as the door on his right opened.

Dr. Clingman stood in the door, mouth open, eyes bulging in surprise

and alarm at the gun in Troy's hand. Then his gaze shifted to Troy's

face, and his expression slowly changed.

"Mister Gordon," he murmured, smiling very cautiously, "you are really

the most difficult man to keep stopped!"

Troy pointed a shaking finger at the speaker. "That!" he cried.

"That ... it said _a thousand years in the ice_!"

Clingman nodded. "Yes." His eyes returned, still rather warily, to

the gun. "And I'm rather glad, you know, you happened to catch that

particular part before I appeared."

Troy was staring at him. "That was their lost home-world--the one

you've kept talking about. That great asteroid cloud here...."

"No, not here." Clingman came forward more confidently into the room,

and Troy saw now that the left side of the scientist's face and head

was covered with medical plastic. "The Cassa system is a long way

behind us, Gordon," Clingman said. "We've been on our way back to Earth

for more than two days."

"To Earth," Troy muttered. "And I...."

* * * * *

Clingman jabbed a stubby finger down on a control switch at the table,

and the wall-speaker went silent. "It will be easier to tell you

directly," he said. "You've already grasped the essential fact--our

Tareeg captors, for the most part, are dead. They were killed, with

some careful assistance from the men in charge of this expedition, by a

weapon developed approximately twelve centuries ago on their ancestral

world. A world which still circles today, though in a rather badly

disintegrated condition, about the Cassa sun....

"But let's be seated, if you will. You gave me a very unpleasant

fright just now." Dr. Clingman touched the side of his face. "I had an

ear shot off recently by a man who didn't wait to have the situation

explained to him. His aim, fortunately, was imperfect. And there is

still a minor war in progress on the _Atlas_. Oh, nothing to worry

about now--it's almost over. I heard less than twenty minutes ago that

the last of the Tareeg guards on board had surrendered. About fifty of

them have become our prisoners. Then there is a rather large group of

armed men in spacesuits in one section of the ship with whom we have

been unable to communicate. They regard us as traitors to the race,

Dr. Dexter and myself in particular. But we have worked out a system

of light signals which should tell them enough to make them willing to

parlay...."

He settled himself carefully into the big chair, turning a white,

fatigued face back to Troy. "That," he said, waving his pudgy hand at

the wall-speaker, "is a talk I made up to explain what actually has

happened to the main body of the mutineers. They comprised a large

majority of the crew and of the expedition members, of course, but

fortunately we were able to gas most of them into unconsciousness

almost at once, so that no further lives have been lost. We have begun

to arouse them again in small groups who are told immediately that the

space ice we were bringing in to Cassa One carried a component which

has resulted in the destruction of the Tareeg force, and who are then

given as much additional information as is needed to answer their

general questions and convince them that we are still qualified to

command the Cassa Expedition. I believe that in a few more days normal

conditions on the ship will have been restored...."

Clingman glanced over at the smoldering cigarette in the tray, stubbed

it out and lit another. "We had been aware for some time of your

plan to escape back to Earth in one of the Tareeg drones," he said.

"It was an audacious and ingenious scheme which might very well have

succeeded. We decided to let you go ahead with it, since it was by no

means certain until the very last day that our own plans would be an

unqualified success. On the other hand, we couldn't let you leave too

early because the Tareegs certainly would have taken the _Atlas_ to

the twin worlds then without completing the Cassa One operation. And

we didn't care to let you in on our secret, for reasons I'm sure you

understand."

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