The planet was mostly rock, cold gray rock, with vast shadows and pits, a corroded sickly surface, hostile and bleak.

Abruptly the Adharan ship came to life. Hatches popped open. Tiny black dots rushed from the ship. The dots increased in number, a flood of specks pouring out of the freighter, scurrying across the sand. Some of them reached the mountains and disappeared among the craters and peaks. Others gained the far side, where they were lost in the long shadows.

"I'll be damned," Shure muttered. "It doesn't make sense. What are they after? We've gone over these planets with a fine tooth comb. There's nothing anyone would want, down there."

"They may have different wants, or different methods."

Shure stiffened. "Look. Their cars are coming back to the ship."

The black dots had reappeared, emerging from the shadows and craters. They hurried back toward the mother worm, racing across the sand. The hatches opened. One by one the cars popped into the ship and disappeared. A few belated cars made their way to the ship and entered. The hatches clamped shut.

"What in hell could they have found?" Shure said.

Communications Officer Barnes entered the control room, craning his neck. "Still down there? Let me have a look. I've never seen an Adharan ship."

On the surface of the planet the Adharan ship stirred. Suddenly it shuddered, quivering from stem to stern. It rose from the surface, gaining altitude rapidly. It headed for the ninth planet. For a time it circled the ninth planet, observing the pitted, eroded surface below. Empty basins of dried-up oceans stretched on like immense pie pans.

The Adharan ship selected one of the basins and settled down to a landing, blowing clouds of exhaust up into the sky.

"The same damn thing again," Shure murmured.

Hatches opened. Black specks leaped out onto the surface and rushed off in all directions.

Shure's jaw jutted out angrily. "We have to find out what they're after. Look at them go! They know exactly what they're doing." He grabbed up the communication mike. Then he dropped it. "We can handle this alone. We won't need Terra."

"It's armed, don't forget."

"We'll catch it as it lands. They're stopping at each planet in order. We'll go all the way in to the fourth planet." Shure moved rapidly, bringing the command chart into position. "When they land on the fourth planet we'll be there waiting for them."

"They may put up a fight."

"Maybe. But we have to find out what they're loading – and whatever it is, it belongs to us."

The fourth planet of the Sirius system had an atmosphere, and some water. Shure landed his cruiser in the ruins of an ancient city, long deserted.

The Adharan freighter had not appeared. Shure scanned the sky and then raised the main hatch. He and Barnes and Nelson stepped outside cautiously, armed with heavy-duty Slem rifles. Behind them the hatch slammed back in place and the cruiser took off, soaring up into the sky.

They watched it go, standing together with their rifles ready. The air was cold and thin. They could feel it blowing around their pressure suits.

Barnes turned up the temperature of his suit. "Too cold for me."

"Makes you realize we're still Terrans, even though we're light years from home," Nelson said.

"Here's the outline," Shure said. "We can't blast them. That's out. We're after their cargo. If we blast them we'll blast the cargo along with them."

"What'll we use?"

"We'll shoot a vapor cloud around them."

"A vapor cloud? But -"

"Captain," Nelson said, "we can't use a vapor cloud. We won't be able to get near them until the vapor has become inert."

"There's a wind. The vapor will dissipate very quickly. Anyhow, it's all we can do. We'll have to take the chance. As soon as the Adharan is sighted, we must be ready to open fire."

"What if the cloud misses?"

"Then we're in for a fight." Shure studied the sky intently. "I think it's coming. Let's go."

They hurried to a hill of piled up rocks, remains of columns and towers heaped in great mounds, mixed with debris and rubble.

"This will do." Shure crouched down, his Slem rifle held tightly. "Here they come."

The Adharan ship had appeared above them. It was preparing to land. Down it settled, its jets roaring, exhaust particles rising. With a crash it struck the ground, bouncing a little and finally coming to rest.

Shure gripped his phone. "Okay."

Above them in the sky the cruiser appeared, sweeping down over the Adharan. From the cruiser a blue-white cloud shot, drilled out by pressure jets directly at the black Adharan ship. The cloud reached the parked freighter. It billowed around it, fusing into it.

The surface of the Adharan hull glowed briefly. It began to fall in, eaten away. Corroded. The Terran cruiser swept past, completing its run. It disappeared into the sky.

From the Adharan ship figures were emerging, jumping out onto the ground. The figures sprang in all directions, long-legged, leaping wildly around. Most of the figures hopped excitedly up onto their ship, dragging hoses and equipment, working frantically, disappearing into the vapor cloud.

"They're spraying."

More Adharans appeared, leaping frantically up and down, onto their ship, onto the ground, some this way, others in no particular direction at all.

"Like when you step on an ant hill," Barnes muttered.

The hull of the Adharan ship was covered with clinging Adharans, spraying desperately, trying to halt the corrosive action of the vapor. Above them the Terran cruiser reappeared, entered a second run. It grew, swelling from a dot into a tear-shaped needle, flashing in the sunlight from Sirius. The freighter's bank of guns jutted up desperately, trying to align themselves with the swiftly moving cruiser.

"Bomb close by," Shure ordered into his phone. "But no direct hits. I want to save the cargo."

The cruiser's bomb racks opened. Two bombs fell, singing down in an expert arc. They straddled the inert freighter, bursting on both sides. Towering clouds of rock and debris rose up, billowing over the freighter. The black form shuddered, Adharans sliding off the hull onto the ground. The bank of guns fired a few futile blasts and the cruiser swept past and disappeared.

"They haven't got a chance," Nelson murmured. "They can't leave the ground until they've got their hull sprayed."

Most of the Adharans were beginning to flee from their ship, scattering onto the ground.

"It's almost over," Shure said. He got to his feet and stepped out from the ruins. "Let's go."

A white flare burst up from the Adharans, showering sparks in the sky. The Adharans milled aimlessly around, confused by the attack. The cloud of vapor had virtually dissipated. The flare was the conventional signal of capitulation. The cruiser was circling again, above the freighter, waiting for orders from Shure.

"Look at them," Barnes said. "Insects, big as people."

"Come on!" Shure said impatiently. "Let's go. I'm anxious to see what's inside."

The Adharan commander met them outside its ship. It moved toward them, apparently dazed from the attack.

Nelson and Shure and Barnes gazed at it in revulsion. "Lord," Barnes muttered. "So that's what they're like."

The Adharan stood almost five feet tall, enclosed in a black chitin shell. It stood on four slender legs, two more weaving uncertainly half-way up its body. It wore a loose belt, holding its gun and equipment. Its eyes were complex, multi-lensed. Its mouth was a narrow slit at the base of its elongated skull. It had no ears.

Behind the Adharan commander a group of crew members stood uncertainly, some of them with weapon tubes partly raised. The Adharan commander made a series of sharp clicks with its mouth, waving its antennae. The other Adharans lowered their tubes.