And for a job like that, MacMaine's special abilities weren't needed.

He could only watch and wait until it was over.

So he watched and waited. Unlike the short-time fury of a s.p.a.ce battle, the reduction of a planet took days of steady pounding. When it was over, the blaster-boats of the Kerothi fleet and the shuttles from the great battle cruisers landed on Houston's World and took possession of the planet.

MacMaine was waiting in his cabin when General Hokotan brought the news that the planet was secured.

"They are ours," the HQ spy said with a superior smile. "The sniveling animals didn't even seem to want to defend themselves. They don't even know how to fight a hand-to-hand battle. How could such things have ever evolved intelligence enough to conquer s.p.a.ce?" Hokotan enjoyed making such remarks to MacMaine's face, knowing that since MacMaine was technically a Kerothi he couldn't show any emotion when the enemy was insulted.

MacMaine showed none. "Got them all, eh?" he said.

"All but a few who scattered into the hills and forests. But not many of them had the guts to leave the security of their cities, even though we were occupying them."

"How many are left alive?"

"An estimated hundred and fifty million, more or less."

"Good. That should be enough to set an example. I picked Houston's World because we can withdraw from it without weakening our position; its position in s.p.a.ce is such that it would const.i.tute no menace to us even if we never reduced it. That way, we can be sure that our little message is received on Earth."

Hokotan's grin was wolfish. "And the whole weak-hearted race will shake with fear, eh?"

"Exactly. Tallis can speak English well enough to be understood. Have him make the announcement to them. He can word it however he likes, but the essence is to be this: Houston's World resisted the occupation by Kerothi troops; an example must be made of them to show them what happens to Earthmen who resist."

"That's all?"

"That's enough. Oh, by the way, make sure that there are plenty of their cargo s.p.a.ceships in good working order; I doubt that we've ruined them all, but if we have, repair some of them.

"And, too, you'd better make sure that you allow some of the merchant s.p.a.cemen to 'escape,' just in case there are no s.p.a.ce pilots among those who took to the hills. We want to make sure that someone can use those ships to take the news back to Earth."

"And the rest?" Hokotan asked, with an expectant look. He knew what was to be done, but he wanted to hear MacMaine say it again.

MacMaine obliged.

"Hang them. Every man, every woman, every child. I want them to be decorating every lamppost and roof-beam on the planet, dangling like overripe fruit when the Earth forces return."

_The Results_

"I don't understand it," said General Polan Tallis worriedly. "Where are they coming from? How are they doing it? What's happened?"

MacMaine and the four Kerothi officers were sitting in the small dining room that doubled as a recreation room between meals. The nervous strain of the past few months was beginning to tell on all of them.

"Six months ago," Tallis continued jerkily, "we had them beaten. One planet after another was reduced in turn. Then, out of nowhere, comes a fleet of ships we didn't even know existed, and they've smashed us at every turn."

"If they _are_ ships," said Loopat, the youngest officer of the _Shudos_ staff. "Who ever heard of a battleship that was undetectable at a distance of less than half a million miles? It's impossible!"

"Then we're being torn to pieces by the impossible!" Hokotan snapped.

"Before we even know they are anywhere around, they are blasting us with everything they've got! Not even the strategic genius of General MacMaine can help us if we have no time to plot strategy!"

The Kerothi had been avoiding MacMaine's eyes, but now, at the mention of his name, they all looked at him as if their collective gaze had been drawn to him by some unknown attractive force.

"It's like fighting ghosts," MacMaine said in a hushed voice. For the first time, he felt a feeling of awe that was almost akin to fear. What had he done?

In another sense, that same question was in the mind of the Kerothi.

"Have you any notion at all what they are doing or how they are doing it?" asked Tallis gently.

"None," MacMaine answered truthfully. "None at all, I swear to you."

"They don't even behave like Earthmen," said the fourth Kerothi, a thick-necked officer named Ossif. "They not only outfight us, they outthink us at every turn. Is it possible, General MacMaine, that the Earthmen have allies of another race, a race of intelligent beings that we don't know of?" He left unsaid the added implication: "_And that you have neglected to tell us about?_"

"Again," said MacMaine, "I swear to you that I know nothing of any third intelligent race in the galaxy."

"If there were such allies," Tallis said, "isn't it odd that they should wait so long to aid their friends?"

"No odder than that the Earthmen should suddenly develop superweapons that we cannot understand, much less fight against," Hokotan said, with a touch of anger.

"Not 'superweapons'," MacMaine corrected almost absently. "All they have is a method of making their biggest ships indetectable until they're so close that it doesn't matter. When they do register on our detectors, it's too late. But the weapons they strike with are the same type as they've always used, I believe."

"All right, then," Hokotan said, his voice showing more anger. "One weapon or whatever you want to call it. Practical invisibility. But that's enough. An invisible man with a knife is more deadly than a dozen ordinary men with modern armament. Are you sure you know nothing of this, General MacMaine?"

Before MacMaine could answer, Tallis said, "Don't be ridiculous, Hokotan! If he had known that such a weapon existed, would he have been fool enough to leave his people? With that secret, they stand a good chance of beating us in less than half the time it took us to wipe out their fleet--or, rather, to wipe out as much of it as we did."

"They got a new fleet somewhere," said young Loopat, almost to himself.

Tallis ignored him. "If MacMaine deserted his former allegiance, knowing that they had a method of rendering the action of a s.p.a.ce drive indetectable, then he was and is a blithering idiot. And we know he isn't."

"All right, all right! I concede that," snapped Hokotan. "He knows nothing. I don't say that I fully trust him, even now, but I'll admit that I cannot see how he is to blame for the reversals of the past few months.

"If the Earthmen had somehow been informed of our activities, or if we had invented a superweapon and they found out about it, I would be inclined to put the blame squarely on MacMaine. But----"

"How would he get such information out?" Tallis cut in sharply. "He has been watched every minute of every day. We know he couldn't send any information to Earth. How could he?"

"Telepathy, for all I know!" Hokotan retorted. "But that's beside the point! I don't trust him any farther than I can see him, and not completely, even then. But I concede that there is no possible connection between this new menace and anything MacMaine might have done.

"This is no time to worry about that sort of thing; we've got to find some way of getting our hands on one of those ghost ships!"

"I do suggest," put in the thick-necked Ossif, "that we keep a closer watch on General MacMaine. Now that the Earth animals are making a comeback, he might decide to turn his coat now, even if he has been innocent of any acts against Keroth so far."

Hokotan's laugh was a short, hard bark. "Oh, we'll watch him, all right, Ossif. But, as Tallis has pointed out, MacMaine is not a fool, and he would certainly be a fool to return to Earth if his leaving it was a genuine act of desertion. The last planet we captured, before this invisibility thing came up to stop us, was plastered all over with notices that the Earth fleet was concentrating on the capture of the arch-traitor MacMaine.

"The price on his head, as a corpse, is enough to allow an Earthman to retire in luxury for life. The man who brings him back alive gets ten times that amount.