IV

It took their eyes a minute to adjust to the slanting afternoon sunlight into which they were thrust. The rocky backbone of the planet pierced the red sands here, and through the ages the wind-driven sand had carved the outcropping into caves and spires and overhanging ledges and gaunt pockmarked cliffs, all piled together in wildest confusion. They were left in a rough, rocky bowl deep within the outcropping, hidden from the desert by the surrounding cliffs and pinnacles.

The tunnel mouth was merely a black hole, almost indistinguishable from a multitude of shadowed cavities where sand-laden storm winds had found soft spots in the stone.

Cautiously Nick climbed the slanting wall of the bowl.

"Come here, Sue," he called.

Shading their eyes against the red glare of the wasteland they could discern the hangars and barracks of Central Camp a few miles to the south, and beyond that the hulking, dark mass of the ancient Martian city. But it was Central Camp, its buildings and landing ground and the thin metallic ribbon of the barrier, that held their attention.

"No ship," Susan said. The small rocket hangars could not possibly hide the bulk of a spacecraft.

"The supply freighter just left. Not another scheduled for eight weeks."

"What'll we do?" she asked plaintively.

Nick's answer was noncommittal. "First we get out of this sun."

"Then we stay here?" Her knowledge of the Martians was useless in this arid waste, and she turned to him for leadership.

"What else?" he replied with a shrug. "We'd scorch on the desert even if the Mec rocket patrols didn't pick us off. Here we can last for a while at least, and hope for a break."

Darkness fell without twilight, and almost at once the air took on a penetrating chill. They found refuge in a sheltered crevice, huddling close together for warmth while the rising wind howled a dirge of desolation and the two moons of Mars cast wavering shadows. They slept fitfully and uneasily.

A pebble clinked against a stone. Nick's eyes opened in the orange dawn. A silhouette that was not human moved against the 

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