“Just hold on a second,” Lea called after him. “Where do you think you’re going?”

“In that direction,” he said, pointing. “I hoped there would be some landmarks, but there aren’t. We’ll have to keep on by dead reckoning. The sun will keep us pretty well on course. If we aren’t there by night the stars will be a better guide.”

“All this on an empty stomach? How about breakfast? I’m hungry—and thirsty.”

“No food.” He shook the canteen that gurgled emptily. It had been only partly filled when he found it. “The water’s low and we’ll need it later.”

“I need it now,” she said shortly. “My mouth tastes like an unemptied ashtray and I’m dry as paper.”

“Just a single swallow,” he said after the briefest hesitation. “This is all we have.”

Lea sipped at it with her eyes closed in appreciation. Then he sealed the top and returned it to the pack without taking any himself. They were sweating as they started up the first dune.

The desert was barren of life; they were the only things moving under that merciless sun. Their shadows pointed the way ahead of them, and as the shadows shortened the heat rose. It had an intensity Lea had never experienced before, a physical weight that pushed at her with a searing hand. Her clothing as sodden with perspiration, and it trickled burning into her eyes. The light and heat made it hard to see, and she leaned on the immovable strength of Brion’s arm. He walked on steadily, apparently ignoring the heat and discomfort.

“I wonder if those things are edible—or store water?” Brion’s voice was a harsh rasp. Lea blinked and squinted at the leathery shape on the summit of the dune. Plant or animal, it was hard to tell. It was the size of a man’s head, wrinkled and grey as dried-out leather, knobbed with thick spikes. Brion pushed it up with his toe and they had a brief glimpse of a white roundness, like a shiny taproot, going down into the dune. Then the thing contracted, pulling itself lower into the sand. At the same instant something thin and sharp lashed out through a fold in the skin, striking at Brion’s boot and withdrawing. There was a scratch on the hard plastic, beaded with drops of green liquid.

“Probably poison,” he said, digging his toe into the sand. “This thing is too mean to fool with—without a good reason. Let’s keep going.”