of Shapelessness. Picked up almost eight thousand Grom, and I don't know how many more we missed."

Pid knew that Shapelessness was a lure of The Shapeless One, the greatest evil that the Grom mind could conceive of. But why, he wondered, did so many Grom fall for His lures?

he Chief guessed his question. "Pid," he said, "I suppose it's difficult for you to understand. Do you enjoy Piloting?"

"Yes, sir," Pid said simply. Enjoy Piloting! It was his entire life! Without a ship, he was nothing.

"Not all Grom feel that way," the Chief said. "I don't understand it either. All my ancestors have been Invasion Chiefs, back to the beginning of time. So of course I want to be an Invasion Chief. It's only natural, as well as lawful. But the lower castes don't feel that way." The Chief shook his body sadly. "I've told you this for a reason. We Grom need more room. This unrest is caused purely by crowding. All our psychologists say so. Another planet to expand into will cure everything. So we're counting on you, Pid."

"Yes, sir," Pid said, with a glow of pride.

The Chief rose to end the interview. Then he changed his mind and sat down again.

"You'll have to watch your crew," he said. "They're loyal, no doubt, but low-caste. And you know the lower castes."

Pid did indeed.

"Ger, your Detector, is suspected of harboring Alterationist tendencies. He was once fined for assuming a quasi-Hunter shape. Ilg has never had any definite charge brought against him. But I hear that he remains immobile for suspiciously long periods of time. Possibly, he fancies himself a Thinker."

"But, sir," Pid protested. "If they are even slightly tainted with Alterationism or Shapelessness, why send them on this expedition?"

The Chief hesitated before answering. "There are plenty of Grom I could trust," he said slowly. "But those two have certain qualities of resourcefulness and imagination that will be needed on this expedition." He sighed. "I really don't understand why those qualities are usually linked with Shapelessness."

"Yes, sir," Pid said.

"Just watch them."

"Yes, sir," Pid said again, and saluted, realizing that the interview was at an end. In his body pouch he felt the dormant Displacer, ready to transform the enemy's power source into a bridge across space for the Grom hordes.

"Good luck," the chief said. "I'm sure you'll need it."

he ship dropped silently toward the surface of the enemy planet. Ger the Detector analyzed the clouds below, and fed data into the Camouflage Unit. The Unit went to work. Soon the ship looked, to all outward appearances, like a cirrus formation.

Pid allowed the ship to drift slowly toward the surface of the mystery planet. He was in Optimum Pilot's Shape now, the most efficient of the four shapes alloted to the Pilot caste. Blind, deaf and dumb, an extension of his controls, all his attention was directed toward matching the velocities of the high-flying clouds, staying among them, becoming a part of them.

Ger remained rigidly in one of the two shapes alloted to Detectors. He fed data into the Camouflage Unit, and the descending ship slowly altered into an alto-cumulus.

There was no sign of activity from the enemy planet.

Ilg located an atomic power source, and fed the data to Pid. The Pilot altered course. He had reached the lowest level of clouds, barely a mile above the surface of the planet. Now his ship looked like a fat, fleecy cumulus.

And still there was no sign of alarm. The unknown fate that had overtaken twenty previous expeditions still had not showed itself.

Dusk crept across the face of the planet as