She was concentrating on keeping her numb legs going like pistons, telling her brain to ignore damage signals from her tortured feet, lungs, and chest, when a shadow covered the moon. She looked around to see it glowing dimly behind a haze about forty degrees above the horizon. They hadn't much time left. Shortly after that, Storm worked his way up the now-elongated column of marchers speaking encouragingly to each one. The Lehiroh reached the front, panting, and paced along to exchange a few words with Jindigar. "I took Shorwh off the sled and had him drop back to march with Frey until I get back. I gave his sled back to Terab."

Terab, the Holot female, had been hardest hit by the heat of the day. If she collapsed, what would Jindigar do? Strap her to one of the sleds like cargo? They'd lose one of the sleds then.

"How is Viradel holding up?" asked Jindigar.

The Lehiroh drew closer to Jindigar and said, "Swearing luridly in nine languages and determined not to be shamed by Krinata. But I think she may have sustained some injury she hasn't mentioned."

"Who do you think will be the first to collapse?"

"Well, we're all right, of course, and the human males aren't in bad shape. The Holot are in the most physiological distress, but they've got spirit. The Cassrians have perked up since sundown. But the male, Trassle, is in difficulty."

Jindigar clamped a hand on Storm's near shoulder. "Not a good situation, I know."

"If this was an Oliat expedition, there'd be no problem! It's trying to drag a bunch of cityworms out of their lairs that's making it hard. We've already got enough breeze to rig the sails and ride out of here! They couldn't sail a dinghy in a reservoir!"

Jindigar laughed. "Don't look down on them. The whole purpose of exploration is to build more cities, so we can breed more cityworms, so we can explore more territory. You and I are as awkward in their territory as they are in ours. And by the time they learn to cope with ours, they'll have built a city in which we'll be awkward."

"Well, if they do, exploring the rest of this planet will take the rest of my life—if not yours!"

"We've got to win that life first, my friend. When you drop back, tell Frey I'm extremely pleased with him, but he should pay attention now to the wind. If we have to cut losses, we must save the water sled at all costs."

"I told him that before I came up here. But I'm praying we can hang on to Sled Four as well."

As Storm stepped out of line to wait for the end, Krinata realized their conversation had carried to her because a definite wind had arisen. At first it blew toward her, then, as they passed the end of another dune, it swirled around to come at her from behind, adding a gentle push to her sled. She had to walk faster to keep ahead of it.

Gradually the rocks became more prevalent. She had thought the footing impossible already, but now her pant legs caught in snarls of dead vegetation, adding bruises and scratches to her miseries. Her throat was on fire, and she could barely swallow, let alone speak, when Jindigar called to her, "Pass the word back, everyone should take a stimtab now, and drink well. The climb is just ahead."

We made it? Her fingers were clumsy at the belt pouch as she got out the precious energy capsule, and she spilled some of the irreplaceable water as she gulped it. But then she was able to pass the word back to Gibson, and she heard him hollering to the other humans strung out far behind.

In moments they hit a gentle slope, and she had to pull the sled upward, at an awkward angle. Then Jindigar called, "Here we must set our sleds on tilt-climb!"

Fuzzily she remembered being shown how to do it, but not in the dark! Letting the harness go slack, she waited for the sled, then danced backward before it as she fumbled with the control cover. She ran numb fingers over the controls, and then, panicked, she called, "I can't do it!"

Jindigar dropped back, free of his sled, risking letting the wind take it away in order to help her. Two moves and he had the cover closed again, the sled now climbing obediently. "Gibson, can you set your sled on climb?" he called.

"I got it now. I passed the word back."

Then Jindigar was gone into the forward gloom, chasing his sled. Krinata squinted against the curtain of fine grit in the air. She had given up trying to keep it out of her mouth. Before long, her feet rolled on fist-size rocks, a dry riverbed that felt like a highway after the sand.

When it was so dark she couldn't make Jindigar's sled out ahead of her, his voice floated back on the whipping wind, "Tune to break out the handlights!" A tiny point of light flared to mark his place. He swung it in an arc to mark the path, and Krinata passed the signal back. He led them from side to side, over a fallen log swept down from some distant hilltop. The wind tore at them, their desert cloaks no protection. The sand abraded Krinata's face right through her face screen. Her whole body was raw, and she was about to give up when she smashed full-tilt into Jindigar.

While she was still stunned, he stopped her sled next to his own, making it settle to the ground. "You can sit here!" he yelled over the roaring wind. Her light showed his face whitened by the sand powdering his indigo nap. His eyes were closed, the bulging eyeballs shrouded by opaque lids, but he moved as if he could see clearly as he helped Gibson stop his sled at an angle to hers, making a shelter. She rested as sleds accumulated and people huddled, exhausted. Then there was an ominous gap in the line of arrivals, and Jindigar took off into the murk, saying, "I'll be right back." His tone said he knew, through Frey, what had gone wrong.

Krinata forced her protesting legs to carry her after Jindigar. Walking into the wind was harder than pulling the sled with the wind. But it was downhill. Her feet slid out from under her, and she fetched up at the bottom of a slope. One of the Cassrians sprawled behind a sled which was dragging him while Frey wrestled it to a halt.

''It's Trassle," Frey announced to Jindigar.

Storm freed the Cassrian of the harness as Krinata joined them. Jindigar swept his light over her, then bent to examine the stiff sectioned body as Frey said, "Cassrians don't have a central circulatory system, but he could be suffering a kind of circulatory collapse."

"Maybe it's just exhaustion," suggested Storm. "If we get him onto the sled, I can pull—"

Jindigar interrupted. "I've got everyone stopped near a place where we can climb to a cave. It's not the best choice, but we've got to try it while we have the strength."

"And before the storm hits," agreed Frey.

"It hasn't?!" asked Krinata.

"Not yet," answered Jindigar. "Frey, can you climb onto the cargo and make a place to tie Trassle securely?"

Handlight swinging from his belt, the young Dushau swarmed up the cargo heap as if he hadn't been hiking all day. Jindigar fashioned a rope cradle for the exoskeletal body, and the three men easily hoisted the Cassrian to the top.

Surveying the situation, Jindigar said, "Krinata, would you be willing to ride on top with Trassle in case he comes to? It may be a dangerous ride."

"I can do it," she replied.

Frey jumped down as if it were no height at all, and Krinata took a grip to climb, wondering where she'd get the strength. Jindigar said, "Let's pamper that arm of yours a bit. Here, I'll give you a boost."

He made a cradle of his two hands. She placed her boot gingerly, and his strength seemed limitless as he raised her until she could scramble aboard and secure herself beside the Cassrian. The three men maneuvered the sled up the slope, keeping it almost level. Another sled followed, and then they were all gathered in one place.

Allel, Trassle's mate, scrambled up beside Krinata, calling piteously to her mate in the Cassrians' multitoned speech, and Krinata slid off the cargo and joined Jindigar, Frey, and the four Lehiroh beneath a forbidding cliff at the side of the river wash. "I think we can get the sleds up there," said Storm, and the three other Lehiroh agreed. "But you've got to get the cityworms out of our way."