"You know why we chose the arctic for our base; it lies in a section of the world never populated by other than roving hunters. But I'll wager anything you want to name that their point is somewhere in Europe where they have people to contend with. If they are using a plane, they can't risk its being seen——"

  "I don't see why not," Ross broke in. "These people couldn't possibly know what it was—Lurgha's bird—magic—"

  Ashe shook his head. "They must have the interference-with-history worry as much as we have. Anything of our own time has to be hidden or disguised in such a way that the native who may stumble upon it will never know it is man-made. Our sub is a whale to all appearances. Possibly their plane is a bird, but neither can bear too close an examination. We don't know what could result from a leak of real knowledge in this or any primitive time ... how it might change history——"

  "But," Ross advanced what he believed to be the best argument against that reasoning, "suppose I handed Lal a gun and taught him to use it. He couldn't duplicate the weapon—the technology required lies so far beyond this age. These people couldn't reproduce such a thing."

  "True enough. On the other hand, don't belittle the ingenuity of the smiths or the native intelligence of men in any era. These tribesmen might not be able to reproduce your gun, but it would set them thinking along new lines. We might find that they would think our time right out of being. No, we dare not play tricks with the past. This is the same situation we faced immediately after the discovery of the atom bomb. Everybody raced to produce that new weapon and then sat around and shivered for fear we'd be crazy enough to use it on each other.

  "The Reds have made new discoveries which we have to match, or we will go under. But back in time we have to be careful, both of us, or perhaps destroy the world we do live in."

  "What do we do now?" McNeil wanted to know.

  "Murdock and I came here only for a trial run. It's his test. The sub is to call for us about nine days from now."

  "So if we sit tight—if we can sit tight—" McNeil lay down again—"they will take us out. Meanwhile we have nine days."

  They spent three more days in the cave. McNeil was on his feet and impatient to leave before Ashe was able to hobble well enough to travel. Though Ross and McNeil took turns at hunting and guard duty, they saw no signs that the tribesmen were tracking them. Apparently Lal had done as he promised, withdrawing to the marsh and hiding there apart from his people.

  In the gray of pre-dawn on the fourth day Ashe wakened Ross. Their fire had been buried with earth, and already the cave seemed bleak. They ate venison roasted the night before and went out into the chill of a fog. A little way down the valley McNeil joined them out of the mist from his guard post. Keeping their pace to one which favored Ashe's healing wound, they made their way inland in the direction of the track linking the villages.

  Crossing that road they continued northward, the land beginning to rise under them. Far away they heard the blatting of sheep, the bark of a dog. In the fog, Ross stumbled in a shallow ditch beyond which lay a stubbled field. Ashe paused to look about him, his nostrils expanding as if he were a hound smelling out their trail.

  The three went on, crossing a whole series of small, irregular fields. Ross was sure that the yield from any of these cleared strips must be scanty. The fog was thickening. Ashe pressed the pace, using his handmade crutch carefully. He gave an audible sigh of relief when they were faced at last by two stone monoliths rising like pillars. A third stone lay across them, forming a rude arch through which they saw a narrow valley running back into the hills.

  Through the fog Ross could sense the eerie strangeness of the valley beyond the massive gate. He would have said that he was not superstitious, that he had merely studied these tribal beliefs as lessons; he had not accepted them. Yet now, if he had been alone, he would have avoided that place and turned aside from the valley, for that which waited within was not for him. To his secret relief Ashe paused by the arch to wait.

  The older man gestured the other two into cover. Ross obeyed willingly, though the dank drops of condensing fog dripped on his cloak and wet his face as he brushed against prickly-leafed shrubs. Here were walls of evergreen plants and dwarfed pines almost as if this tunnel of year-round greenery had been planted with some purpose in mind. Once his companions had concealed themselves, Ashe called, shrill but sweetly, with a bird's rising notes. Three times he made that sound before a figure moved in the fog, the rough gray-white of its long cloak melting in the wisps of mist.

  Down that green tunnel, out of the heart of the valley, the other came, a loop of cloak concealing the entire figure. It halted right in back of the arch and Ashe, making a gesture to the others to stay where they were, faced the muffled stranger.

  "Hands and feet of the Mother, she who sows what may be reaped——"

  "Outland stranger who is under the Wrath of Lurgha," the other mocked him in the voice of Cassca. "What do you want, outlander, that you dare to come here where no man may enter?"

  "That which you know. For on the night when Lurgha came you also saw——"

  Ross heard the hiss of a sharply drawn breath. "How knew you that, outlander?"

  "Because you serve the Mother and you are jealous for her and her service. If Lurgha is a mighty god, you wanted to see his acts with your own eyes."

  When she finally answered, there was anger as well as frustration in her voice. "And you know of my shame then, Assha. For Lurgha came—on a bird he came, and he did even as he said he would. So now the village will make offerings to Lurgha and beg his favor, and the Mother will no more have those to harken to her words and offer her the first fruits——"

  "But from whence came this bird which was Lurgha, can you tell me that, she who waits upon the Mother?"

  "What difference does it make from what direction Lurgha came? That does not add nor take from his power." Cassca moved beneath the arch. "Or does it in some strange way, Assha?"

  "Perhaps it does. Only tell me."

  She turned slowly and pointed over her right shoulder. "From that way he came, Assha. Well did I watch, knowing that I was the Mother's and that even Lurgha's thunderbolts could not eat me up. Does knowing that make Lurgha smaller in your eyes, Assha? When he has eaten up all that is yours and your kin with it?"

  "Perhaps," Assha repeated. "I do not think Lurgha will come so again."

  She shrugged, and the heavy cloak flapped. "That shall be as it shall be, Assha. Now go, for it is not good that any man come hither."

  Cassca paced back into the heart of the green tunnel, and Ross and McNeil came out of concealment. McNeil faced in the direction she had pointed. "Northeast—" he commented thoughtfully, "the Baltic lies in that quarter."

  CHAPTER 8

  "... and that is about all." Ten days later Ashe, a dressing on his leg and a few of the pain lines smoothed from his face, sat on a bunk in the arctic time post nursing a mug of coffee in his hands and smiling, a little crookedly, at Nelson Millaird.

  Millaird, Kelgarries, Dr. Webb, all the top brass of the project had not only come through the transfer point to meet the three from Britain but were now crammed into the room, nearly pushing Ross and McNeil through the wall. Because this was it! What they had hunted for months—years—now lay almost within their grasp.

  Only Millaird, the director, did not seem so confident. A big man with a bushy thatch of coarse graying hair and a heavy, fleshy face, he did not look like a brain. Yet Ross had been on the roster long enough to know that it was Millaird's thick and hairy hands that gathered together all the loose threads of Operation Retrograde and deftly wove them into a workable pattern. Now the director leaned back in a chair which was too small for his bulk, chewing thoughtfully on a toothpick.

  "So we have the first whiff of a trail," he commented without elation.

  "A pretty strong lead!" Kelgarries broke in. Too excited to sit still, the major stood with his back against the door, as alert as if he were about to turn and face
the enemy. "The Reds wouldn't have moved against Gog if they did not consider it a menace to them. Their big base must be in this time sector!"

  "A big base," Millaird corrected. "The one we are after, no. And right now they may be switching times. Do you think they will sit here and wait for us to show up in force?" But Millaird's tone, intended to deflate, had no effect on the major.

  "And just how long would it take them to dismantle a big base?" that officer countered. "At least a month. If we shoot a team in there in a hurry—"

  Millaird folded his huge hands over his barrel-shaped body and laughed, without a trace of humor. "Just where do we send that team, Kelgarries? Northeast of a coastal point in Britain is a rather vague direction, to say the least. Not," he spoke to Ashe now, "that you didn't do all you could, Ashe. And you, McNeil, nothing to add?"

  "No, sir. They jumped us out of the blue when Sandy thought he had every possible line tapped, every safeguard working. I don't know how they caught on to us, unless they located our beam to this post. If so, they must have been deliberately hunting us for some time, because we only used the beam as scheduled——"

  "The Reds have patience and brains and probably some more of their surprise gadgets to help them. We have the patience and the brains, but not the gadgets. And time is against us. Get anything out of this, Webb?" Millaird asked the hitherto silent third member of his ruling committee.

  The quiet man adjusted his glasses on the bridge of his nose, a flattish nose which did not support them very well. "Just another point to add to our surmises. I would say that they are located somewhere near the Baltic Sea. There are old trade routes there, and in our own time it is a territory closed to us. We never did know too much about that section of Europe. Their installation may be close to the Finnish border. They could disguise their modern station under half a dozen covers; that is strange country."

  Millaird's hands unfolded and he produced a notebook and pen from a shirt pocket. "Won't hurt to stir up some of the present-day agents of the M.I. and the rest. They might just come up with a useful hint. So you'd say the Baltic. But that is a big slice of country."

  Webb nodded. "We have one advantage—the old trade routes. In the Beaker period they are pretty well marked. The major one into that section was established for the amber trade. The country is forested, but not so heavily as it was in an earlier period. The native tribes are mostly roving hunters, and fishermen along the coast. But they have had contact with traders." He shoved his glasses back into place with a nervous gesture. "The Reds may run into trouble themselves there at this time——"

  "How?" Kelgarries demanded.

  "Invasion of the ax people. If they have not yet arrived, they are due very soon. They formed one of the big waves of migratory people, who flooded the country, settled there. Eventually they became the Norse or Celtic stock. We don't know whether they stamped out the native tribes they found there or assimilated them."

  "That might be a nice point to have settled more definitely," McNeil commented. "It could mean the difference between getting your skull split and continuing to breathe."

  "I don't think they would tangle with the traders. Evidence found today suggests that the Beaker folk simply went on about their business in spite of a change in customers," Webb returned.

  "Unless they were pushed into violence." Ashe handed his empty mug to Ross. "Don't forget Lurgha's Wrath. From now on our enemies might take a very dim view of any Beaker trade posts near their property."

  Webb shook his head slowly. "A wholesale attack on Beaker establishments would constitute a shift in history. The Reds won't dare that, not just on general suspicion. Remember, they are not any more eager to tinker with history than we are. No, they will watch for us. We will have to stop communication by radio——"

  "We can't!" snapped Millaird vehemently. "We can cut it down, but I won't send the boys out without some means of quick communication. You lab boys put your brains to work and see what you can turn out in the way of talk boxes that they can't snoop. Time!" He drummed on his knee with his thick fingers. "It all comes back to a question of time."

  "Which we do not have," Ashe observed in his usual quiet voice. "If the Reds are afraid they have been spotted, they must be dismantling their post right now, working around the clock. We'll never again have such a good chance to nail them. We must move now."

  Millaird's lids drooped almost shut; he might have been napping. Kelgarries stirred restlessly by the door, and Webb's round face had settled into what looked like permanent lines of disapproval.

  "Doc," Millaird spoke over his shoulder to the fourth man of his following, "what is your report?"

  "Ashe must be under treatment for at least five days. McNeil's burns aren't too bad, and Murdock's slash is almost healed."

  "Five days—" Millaird droned, and then flashed a glance at the major. "Personnel. We're tied down without any useful personnel. Who in processing could be switched without tangling them up entirely?"

  "No one. I can recall Jansen and Van Wyke. These ax people might be a good cover for them." The momentary light in Kelgarries' eyes faded. "No, we have no proper briefing and can't get it until the tribe does appear on the map. I won't send any men in cold. Their blunders would not only endanger them but might menace the whole project."

  "So that leaves us with you three," Millaird said. "We'll recall what men we can and brief them again as fast as possible. But you know how long that will take. In the meantime——"

  Ashe spoke directly to Webb. "You can't pinpoint the region closer than just the Baltic?"

  "We can do this much," the other answered him slowly, and with obvious reluctance. "We can send the sub cruising offshore there for the next five days. If there is any radio activity—any communication—we should be able to trace the beams. It all depends upon whether the Reds have any parties operating from their post. Flimsy——"

  "But something!" Kelgarries seized upon it with the relief of one who needed action.

  "And they will be waiting for just such a move on our part," Webb continued deliberately.

  "All right, so they'll be watching!" the major said, about to lose his temper, "but it is about the only move we can make to back up the boys when they do go in."

  He whipped around the door and was gone. Webb got up slowly. "I will work over the maps again," he told Ashe. "We haven't scouted that area, and we don't dare send a photo-plane over it now. Any trip in will be a stab in the dark."

  "When you have only one road, you take it," Ashe replied. "I'll be glad to see anything you can show me, Miles."

  If Ross had believed that his pre-trial-run cramming had been a rigorous business, he was soon to laugh at that estimation. Since the burden of the next jump would rest on only three of them—Ashe, McNeil, and himself—they were plunged into a whirlwind of instruction, until Ross, dazed and too tired to sleep on the third night, believed that he was more completely bewildered than indoctrinated. He said as much sourly to McNeil.

  "Base has pulled back three other teams," McNeil replied. "But the men have to go to school again, and they won't be ready to come on for maybe three, four weeks. To change runs means unlearning stuff as well as learning it——"

  "What about new men?"

  "Don't think Kelgarries isn't out now beating the bushes for some! Only, we have to be fitted to the physical type we are supposed to represent. For instance, set a small, dark-headed pugnose among your Norse sea rovers, and he's going to be noticed—maybe remembered too well. We can't afford to take that chance. So Kelgarries had to discover men who not only look the part but are also temperamentally fitted for this job. You can't plant a fellow who thinks as a seaman—not a seaman, you understand, but one whose mind works in that pattern—among a wandering tribe of cattle herders. The protection for the man and the project lies in his being fitted into the right spot at the right time."

  Ross had never really thought of that point before. Now he realized that he and Ashe and McNeil were of a
common mold. All about the same height, they shared brown hair and light eyes—Ashe's blue, his own gray, and McNeil's hazel—and they were of similar build, small-boned, lean, and quick-moving. He had not seen any of the true Beakermen except on the films. But now, recalling those, he could see that the three time traders were of the same general physical type as the far-roving people they used as a cover.

  It was on the morning of the fifth day while the three were studying a map Webb had produced that Kelgarries, followed at his own weighty pace by Millaird, burst in upon them.

  "We have it! This time we have the luck! The Reds slipped. Oh, how they slipped!"

  Webb watched the major, a thin little smile pulling at his pursed mouth. "Miracles sometimes do happen," he remarked. "I suppose the sub has a fix for us."

  Kelgarries passed over the flimsy strip of paper he had been waving as a banner of triumph. Webb read the notation on it and bent over the map, making a mark with one of those needle-sharp pencils which seemed to grow in his breast pocket, ready for use. Then he made a second mark.

  "Well, it narrows it a bit," he conceded. Ashe looked in turn and laughed.

  "I would like to hear your definition of 'narrow' sometime, Miles. Remember we have to cover this on foot, and a difference of twenty miles can mean a lot."

  "That mark is quite a bit in from the sea." McNeil offered his own protest when he saw the marking. "We don't know that country—"

  Webb shoved his glasses back for the hundredth time that morning. "I suppose we could consider this critical, condition red," he said in such a dubious tone that he might have been begging someone to protest his statement. But no one did. Millaird was busy with the map.

  "I think we do, Miles!" He looked to Ashe. "You'll parachute in. The packs with which you will be equipped are special stuff. Once you have them off sprinkle them with a powder Miles will provide and in ten minutes there won't be enough of them left for anyone to identify. We haven't but a dozen of these, and we can't throw them away except in a crisis. Find the base and rig up the detector. Your fix in this time will be easy—but it is the other end of the line we must have. Until you locate that, stick to the job. Don't communicate with us until you have it!"