This was placed across the passage, a frail enough barrier. The furred one watched Diskan's actions with concentrated interest. When the young man returned to the room, Julha was on her knees by the pallet, about to administer a Sustain injection to the Zacathan.

  "It would be good to know," Zimgrald remarked, "how much time the Armored Spirit allows us before disaster swoops like a grahawk. But that is another of the puzzles past our solving. Do not hesitate, little one. I am as eager to be away from this hole as the twain of you!"

  His reaction to the reviving injection came swiftly, and when he got to his feet, he moved with only a small hesitation. Diskan swung the larger pack to his back; the girl took up the smaller. They went into the passage where the furred one lingered. As they came out, the animal turned and limped along the unknown way, Zimgrald at its heels with Julha, while Diskan brought up the rear. He glanced back once at the framework of the device he had set up in the corridor. According to the Zacathan, it would deter pursuit; Diskan had no idea how. He only trusted that it would.

  Chapter 12

  Zimgrald carried a torch but did not snap it on. The diffusion of light from the growths appeared to satisfy the Zacathan. Diskan could see no other sign that anyone else had trod this way before them. He began to marvel at the recuperative powers of the Hist Techneer, for Zimgrald was keeping a gliding pace equaling a fast walk for his two companions, while a little to the fore limped the furred one as guide.

  "High One." Julha touched the shoulder of the Zacathan. "That Sustain shot, it will wear off—"

  "All the greater reason, little one, for us to make speed now." There was an almost cheerful note in the alien's voice. "Do not concern yourself; our bodies are not alike. I shall perhaps surprise you with my ability to keep the trail. Fentress—" He raised his voice a little so the name boomed back at Diskan.

  "Yes?"

  "What is your knowledge of this world?"

  "Very little. My ship crashed at setdown and rolled into one of the mud pools. I had been in freeze and so was lucky, for the emergency ejector got me out. There was a rising ridge of solid ground, and I came along that. Then I found the survivor cache—"

  "And the city. But not without guidance. Now that is the truth, is it not? Guidance such as this." One of the four-digited yellow-gray hands gestured toward the furred one.

  "Yes—"

  "But you are the son of the Scout who first discovered Mimir. You must know more—" There was pressure behind that, Diskan knew. Perhaps the Zacathan had his own suspicions under his outward acceptance of Diskan.

  But Diskan was not going to spill all his own past history at the bidding of this alien, even if that would settle the other's doubts.

  "A First-in Scout visits many planets during his service. Not even he can remember them without a tape—" The minute he said that, Diskan knew he had made a mistake.

  "A tape—ah, yes. You crashed on Mimir. Yet this world is far from any transport lane, Fentress. It is not on any commercial or open-travel voyage tape. There would be no normal reason for you to visit Mimir."

  "I came for reasons of my own!" Diskan snapped.

  He could see the pale oval of Julha's face as she glanced back, though Zimgrald had not turned his head. And Diskan thought that, even in this dim light, he could see the wariness again in her eyes.

  "Reasons that might have something to do with those who seek us?" The Zacathan continued to probe.

  "No!" Diskan hoped that the very explosiveness of that reply would carry the accent of truth. "Until my ship planeted here, I did not even know Mimir existed."

  "Yet your ship came on tape if you were in freeze." No hint of suspicion, yet Diskan knew that he must satisfy the other or those questions would chip away at him.

  "Yes, my ship was on tape, but I did not know the tape destination. It was blind chance that it was Mimir. I'm not a pilot; the ship was on auto. I don't even know why it crashed. I wasn't curious until it started the ride down and failed. Why the ship was on tape is my business, but I'll swear by any power you want to name that it had nothing to do with what you have met here!"

  To his own ears that sounded a little too quick, too emphatic. Under the circumstances, he was not sure that had he been Zimgrald, he would have believed it. He was sure that Julha did not, for she walked faster, close to the Zacathan, lengthening the space between them. And perversely, Diskan allowed her to do that. Let them believe it or not—he had told the truth.

  "You have satisfied my curiosity acceptably, Fentress. These oddities of blind chance do exist, as no one can deny. The X factor—"

  "X factor?" Diskan repeated. Had the Zacathan meant what he said? Did he believe that Diskan was speaking the truth or was he only willing, for now, to accept the explanation, cloaking his doubts?

  "Yes, the X factor—that which comes of itself to throw askew equations, speculations, lives, history, that unknown twist or turn of small events that changes a man's personal future, the work he would do, or the future of a people and an empire from one possibility track to another. One may have a problem close to smooth solving. Then the X factor arises to make the simple complex, all calculations wrong. Thus, to Mimir you may be the X factor, and to you Mimir may be the same. So I believe.

  "This chance we cannot control or understand may have delivered you here at just this time. Ah—" There came a sound not unlike a human chuckle. "How interesting life may become without warning! This Mimir is a world of many puzzles; perhaps we shall add to that number. Now—what have we here?"

  The passage ended. Julha gave a little cry, which held an undercurrent of fear. Diskan moved up to join them.

  There was a vast expanse broken only by lines of huge blocks supporting a ceiling above, rising out of a weird marsh.

  Though Zimgrald switched on the lamp, sending its powerful beam down the aisles between the pillars, it revealed nothing but pools of murky water, the fungi growths, a nightmare of swamp. The furred one lowered its head to sniff at the edge of a pool reaching to their feet. It hissed, spat, made a lightning-swift dab with a forepaw. There were ripples on the surface of the water, sending bobbing several padlike plants floating there. Then the Mimiran animal sat up on its haunches to look at the off-worlders. In warning? Diskan wondered.

  Dare he try contact? He knew the danger of that reaching out, or thought he did. Why did it come to mind again now and with so strong an urge? He pushed aside fear and tried to reach the brain behind those burning eyes.

  There was a sensation of dizzy spinning, of being caught and whirled about by a power much stronger than he was. Diskan heard himself cry out. He was in a panic because no effort of his could free him from the spin.

  "Diskan!"

  His head bobbed loosely on his shoulders; he swayed in the grip of the Zacathan on the very edge of that poisonous pool. Still the furred one sat upright, watching, reaching. Reaching, that was it! Of his own free will, Diskan had opened a door and through it something had reached for him, almost sucked him out into an unknown so appalling that he shuddered with the sickness the thought of it aroused in him. Had he been lost in that unthinkable, he would never have returned.

  With the Zacathan's hands still on him, Diskan backed away from the animal, feeling as weak as if he had survived, just barely survived, some indescribable ordeal.

  "What happened?" Zimgrald's voice in Diskan's ear was very steadying, as if he leaned his whole trembling body against a solid and sustaining support.

  "I—I tried to make mental contact with—with that!"

  His hand rose almost of itself and pointed stiffly at the furred one. The outthrust fingers might have been a stunner he was aiming in his own defense.

  "Contact? You are a xeno-path?"

  "I—sometimes I can make an animal, or a bird, do as I wish. Before I was afraid, but I did it now, I don't know why—!"

  "And you found far more than you expected." No question, a brisk statement of fact. "Yes, these are telepaths to a high degree, thou
gh not of any order I have had previous knowledge of. But, again, this is luck. If you can establish better communication with them than I have been able to do—"

  Diskan twisted free from the other's hold. "No! Never again! I tell you, it—it would take me!" He tried to explain, and his old inability to fit words and thoughts neatly together made him stammer. He was ready to defend himself from such a risk with a stunner—with his bare hands if need be!

  Then common sense reasserted control. The Zacathan could not make him try contact, not unless the alien put him under some form of hypo-control. And he would make sure that did not happen. Diskan was about to voice that defiance when they were startled by a sound echoing down the passage from which they had just emerged.

  Zimgrald's features, with their lizard cast, sharpened; his neck frill arose in a wide fan behind head and shoulders.

  "So, they found our surprise." His words were close to a hiss. "We have very little time after all!"

  Julha caught at the Zacathan's arm. "High One, what do we do?"

  The Zacathan's frill fluttered and began to refold. "Why, little one, we splash forward—or rather we pick the best footing possible." He looked at the furred one. "This one knows what we want—escape. It will, I believe, continue to aid us. Certain emotions are strong enough to project in themselves—fear, hate, love—and fear we shall depend upon now to do our pleading for us. But it is best we move on. That surprise will deter them from the trail for a space, but it is no lasting barrier."

  But they did not go forward, out into the swamp. The furred one dropped to all fours and headed right, along the wall through which the passage had entered. Zimgrald appeared quite content to follow the animal's lead. A hand on Diskan's arm, he pulled the young man forward, Julha on his other side.

  Once again the Zacathan switched off the lamp. Diskan was about to protest when he saw the wisdom of that action. The far-flung beam might not only advertise their coming to some unknown menace ahead, but it could also be sighted readily by those following.

  Here the luminescence of the growths was not quite so concentrated as it had been in the passage, but there was enough radiance to show them their footing, and the animal's, a few paces in advance.

  "What is this place?" Julha ventured after they had gone a short way.

  "Who knows?" Zimgrald answered. "For some reason, the city builders needed it. These piers must support a goodly portion of buildings above. But the why of this cave? Who can tell that?" His frill lifted a little as he shrugged. "In its time it had a use or it would not be. This city has always been wedded to water—"

  "Yes," Diskan broke in dreamily, "the flowing streets, the cool, clean flowing streets—"

  "Yes," prompted the Zacathan gently. "What of these flowing streets?"

  For a second of time Diskan was back in his dream. "Sweet water, scented water—water of the streets of Xcothal—" His voice trailed off as he came out of that half spell and knew that both of them were listening to him alertly.

  "You have dreamed?" Not gently now—a demand, quick and pressing.

  "Once I walked in Xcothal with the water washing about me." Diskan gave the alien the truth.

  "And what did you learn of Xcothal when you walked thus?"

  "That it was beauty, color, light—a very fair place."

  "And that you would walk there again if you could?"

  "Yes—" At that admission he felt the Zacathan's grasp on his arm tighten and then relax.

  "So they reached you—with that they reached you! You see, little one." Zimgrald spoke to the girl. "The dreams are not evil; they were reaching—"

  She shook her head emphatically. "No! Those dreams were horrible; they threatened! I did not walk streets of water in beauty; I fled through dark hallways and ever they hunted me!"

  "Who?" Diskan asked. "The Jacks?"

  Again she shook her head, with even more force. "No, I never saw who—only knew that they wanted me. And it was very bad. We did not dream alike, though I, too, was in a city—"

  "Xcothal—" Zimgrald repeated the name thoughtfully. "This name for the city, it is from your dream?"

  "It is. And this is Xcothal—but not the one I saw then."

  "Living flesh for a moment laid across the crumbling bones. You have some strange gift, Fentress, one that I envy you. In my mind I can build a picture when I look out over tumbled stones and long deserted buildings. Training, memory, surmise all give me bits to fit together into a picture, but I know that never is the picture the full truth. Sometimes it may fit close, but a line is wrong here and a curve there—"

  Diskan had an inspiration. "The X factor?"

  Zimgrald chuckled again. "Undoubtedly—the X factor. It is missing for me; it may not be for you. Perhaps you can evoke the picture that fits perfectly!"

  "I'm no archaeologist."

  "What are you, Diskan Fentress?" asked the Zacathan.

  The old bitterness shadowed his reply. "Nothing—nothing at all. No—" The desire arose in him to shock, to break the Zacathan's calm. "That is not the truth. I am a criminal—a subject for stabilizing treatment if I am found!"

  Julha missed a step, but Zimgrald gave a small sound like a snort.

  "I do not doubt that either, Fentress; you are so proud of it, as a definite victory for you. But why do you consider it a victory? What life-vise are you fleeing in such haste? No, do not fret—I shall not pick below the surface you have chosen to shell you in. Only you are far more than you guess. Do not crawl into the mud when you can soar. Ha—do you notice anything about the atmosphere now, children?"

  The quick change of subject left Diskan tongue-tied, but Julha responded.

  "It is warmer!"

  "I thought so, though the Sustain has given me protection against any chill. Now why is this so?"

  Not only was it indeed warmer—the warmest Diskan had known, save directly by the fireside, since he had landed on Mimir—but the rank air carried another taint. Zimgrald sniffed, drawing in deep breaths and expelling them several times, before he gave a small nod.

  "Warm springs, perhaps. A natural phenomenon, but hardly to be expected under a city, though we should always disabuse our minds of the 'expected.' There is never just what we expect. Our friend waits—"

  The Mimiran animal had indeed halted at the foot of a broad stone, slimed here and there with splotches of evil-looking growths, angled to their left and lifting at an incline out into the open marsh. Zimgrald surveyed what they could see of it.

  "A bridge of sorts. But watch the footing. On stone, those slime patches can be highly treacherous."

  "They were!" Julha darted forward, to pick up and bring back a gleaming object. She held it out to Zacathan. "Mik dropped this!"

  "A refill tube for a hand beam." Zimgrald identified it. "Yes, we might reasonably suppose this to be s'Fan's." He clicked on his more powerful lamp, bringing into brilliant focus that rising arch of stone and its approaches. Well up the incline was a smear. A body crushing one of the growths in a fall could well have left that sign.

  "Mik!" Julha clapped her hands together. "He must be ahead of us—on this very way! He could still be alive, he could be!"

  "It is possible," Zimgrald agreed. But inwardly Diskan doubted that the Zacathan was any more hopeful of finding the missing explorer than he was. "No, child." The alien put out a hand to restrain Julha. "Hurry here we do not! We cannot risk any accidents. See, observe the caution of our guide—"

  The furred one had started up the bridge, if bridge it was, but as the Zacathan pointed out, the animal advanced with caution, weaving a crooked way that took it around those slime patches. And, gingerly, the three fell into a single line, to track in the same way.

  As they went, the chemical fumes grew thicker, rising from the swamp. The reek reached them in puffs, as if exhaled in regular gasps. Once up the first approach, the ramp ceased to climb but leveled off and ran, as a rampart or road, straight out between two ranks of the thick block supports, into the genera
l gloom of the cavern.

  For spaces, the slime patches failed and the furred one hurried. Then would come another line of splotches, and they went back to their weaving in and out among them. Diskan thought that their guide not only feared the slipperiness of those smears but also knew that contact with them was dangerous. He remembered the stinging burn from the growth he had brushed against back in the passage and decided that such caution was well merited.

  "Where can the end of this be?" Julha asked at last.

  Time was only relative to action, Diskan knew, but they had been walking this raised road for what seemed a long period. He glanced back several times, trying to make out the wall from which they had come, but the limited light from the fungi made shadows close in behind them, and he could see very little. Meanwhile, the ramp stretched endless before them.