The feeling was so powerful that it was almost terrifying. Blade clung to Twana, not only in passion, but in the need to hold on to some part of the real world. She clutched him in an even greater frenzy, and he could feel her shaking as he moved within her.

He moved slowly at first, although it cost him a heroic effort at self-restraint. If he'd let himself go, he would have taken Twana with a desperate fury certain to frighten her half out of her wits. So he was gentle, almost delicate. Gradually he felt Twana's movements rise to match his and then move beyond them. Under the fear there was a core of passion in her, and he was reaching it.

Blade threw off all restraint and no longer held himself back. He no longer needed to, and he couldn't have done so even if he'd wanted to. Twana clutched him tighter and began to moan.

Suddenly the moans turned into a shrill scream. Twana writhed and twisted, her mouth pouring out wild, meaningless sounds, her legs clamped tight around Blade and her nails raking his back. He could feel her twisting within as well, as every part of her body threw itself into a wild convulsion of released desire.

Then Twana's convulsion drew Blade up to his own peak and pushed him over. She cried out again as she felt him pouring himself hotly into her, and a third time as his arms tightened around her like steel bands. Then Blade was sagging down on her, as though all his strength had poured out of him along with all his desire. His head came to rest between Twana's breasts, and her hands drifted down to rest lightly in his tangled hair.

It was a while before they found the strength to untangle themselves long enough to pull the blankets over them. Even that strength didn't last long. Both of them were asleep within a few minutes, and it didn't matter whether the Shoba's men and sniffers were one mile away or a thousand.

They lay snugly together until just before dawn. Then Blade woke, crept out from the blankets without waking the sleeping girl, and drank some water. He woke Twana, and together they collected their gear and headed toward the hills.

Twana's face grew more strained as the hills and the Wall on top loomed higher and higher above them. She stayed quiet until they'd reached the very foot of the nearest hill. Blade unslung his pack and turned toward the slope, and that drew a wild cry from her.

«No, Blade! Do not! You must not go up there! The Watchers will take you. You must not die and leave me alone!»

Blade turned. This seemed as good a time as any to find out what made Twana so fearful of the hills and the Wall. «What are the Watchers, Twana, that a warrior needs to be afraid of them? The Shoba's men found me hard to kill. Why should the Watchers have it any easier?»

«You do not understand, Blade. The Watchers who defend the Wall are not men. You are strong against men, but… «

Blade held up a hand to interrupt her. «The Watchers are not men? Then what are they?»

Twana swallowed. «It-they-no one can say for sure. Those who could know-they are dead. The Watchers killed them.»

«How?»

Once more Blade had to piece together a picture out of Twana's disjointed answers to a series of questions. When he'd finished, he understood why the Watchers of the Wall, like the Shoba's sniffers, were something to be feared.

The Wall had marched along the crests of the hills to the west as far back as the memory of Twana's people went. During all that time, it had been protected by the Watchers. These were not men, but great monsters that seemed to have something of the shape of a man. They were many times the size of the largest man though. They moved in ways no living creature ever could, and they shone all over as if they were made of metal.

They caught and killed anyone who came too close to the Wall. This was certain, for they had been seen to do it. No one knew exactly how they killed or why, but it was certain that they did. No one who had gone up to the base of the Wall had ever come back down. Even the Shoba's men would not go where they might have to face the invincible Watchers. They would not even light fires or post sentries when they were close to the Wall, for fear of drawing the anger of the Watchers.

Twana's story of the Watchers still further aroused Blade's curiosity. Like the Wall itself, the Watchers hinted at an advanced civilization lying somewhere to the west. Unlike the Wall, which could have stood a thousand years after the last of its builders vanished, the Watchers suggested that civilization still survived.

For the moment this would make no difference to Blade's plans. He would cheerfully risk his own neck many times over to satisfy his curiosity, but he would not put Twana in danger if he could avoid it. They would continue their flight as if the Wall and the Watchers didn't exist, until either they were safe or the Shoba's men overtook them.

«Very well. We shall not go near the Wall unless the Shoba's men are about to catch us. Then we will go up the hill and take our chances with the Watchers.»

«But…»

«Twana, the Shoba's men will kill us when they catch us, won't they?» She nodded, shuddering. «Then what do we have to lose? Even if the Watchers do kill us, it will surely be a quicker, cleaner death than the Shoba's men would give us. And who knows? The Watchers may not kill us after all. Perhaps the men who went up to the Wall found a rich land, with beautiful women and rivers of beer. They didn't come back because they didn't want to.» It was a feeble joke, but enough to make Twana smile. She was still smiling as Blade turned to the slope and began scrambling upward.

The smile died swiftly when he returned, his face set as hard as the rocks of the hillside. «They are coming after us, aren't they?» she said.

«Yes. Mounted men, light carts, and two things that move low along the ground.»

The sniffers. Neither of them said the word, because it wasn't necessary. Blade had a brief, bleak moment of realizing that Twana had been right. If the Shoba's men had been willing to follow this far, they were not easily discouraged. If the sniffers could follow such a faint trail, they were as good as Twana said they were. The odds were not good.

They weren't hopeless either. If the Shoba's men weren't easily discouraged, neither was Blade. Sniffers might have supernatural powers of scent, but not after they were dead. If all else failed, there was still the Wall.

Blade slung his pack and took Twana's hand. The chase was on again, deadlier than before.

The next three days were exhausting, but also a challenge to Blade's skill and experience. He could almost have enjoyed it if Twana hadn't been with him and if the stakes hadn't been so high. If they were caught, the best they could hope for was a swift death.

Blade used every trick that he'd ever learned and a few he made up on the spot. He sought out the rockiest ground, where there was nothing to show a footprint or hold a scent. He zigzagged and doubled back whenever he could afford the time and distance. He marched for miles in his bare feet, carrying Twana on his back. He led the chase through every stream and pond that was shallow enough to wade. Once they even took off their clothes and swam a mile down a small river. Another time they came to a stand of trees that grew close together. They climbed the nearest tree and covered several hundred yards by swinging from branch to branch, like Tarzan of the Apes. They did everything except walk on their hands, and Blade would have done that if possible.

It was not enough.

The sniffers never lost the trail, at least not for more than an hour or two. Every time Blade climbed the hill to look to the north, the Shoba's men were a little bit closer.