The piloting compartment was empty. Somewhat relieved, he sneaked back through the hold, empty also, and into the drive compartment. Empty. Nothing seemed disturbed.

He left the ship cautiously, this time making sure that the door was locked. He made a wide sweep around the cabin and machine shop and tried to assure himself that no one was inside the corral. But in the starlight, fifty men might have hidden in the sage, simply by crouching down and holding still.

He returned to the cabin, whistling to Art as he approached. "About time you got back," Art complained. "I was just about to roust out the others and come and get you. Find anything?"

"No. Anything more out of the squawk box?"

"Not a peep."

"Could it have been a coyote brushing against the wire?"

"How would a coyote get through the outer fence?" Art wanted to know.

"Dig under it. There are coyotes in here. We've heard them."

"You can't tell how far a coyote is from you by its howl."

"Listen to the old desert rat! Well, leave the light on, but go back to bed. I'll be awake. I've got to be up in another hour in any case. Crawl in the sack." Cargraves settled down to a pipe and some thought.

Cargraves was too busy on the trip to Albuquerque to worry about the preceding night. Ross's style of herding his hot rod left little time to think about anything but the shortness of life and the difficulty of hanging on to his hat. But Ross poured them into the city with plenty of time for shopping.

Cargraves selected two Garand rifles, Army surplus stock at a cheap price, and added a police thirty-eight special, on a forty-five frame. His mouth watered at a fancy sporting rifle with telescopic sights, but money was getting short; a few more emergency purchases or any great delay in starting would bankrupt the firm.

He ordered a supply of army-style C-rations and K-rations for the trip. Ross remarked privately, while the clerk wrote up the order, "In most stories about space travel, they just eat pills of concentrated food. Do you think it will ever come to that?"

"Not with my money," the physicist answered. "You guys can eat pills if you want to. I want food I can get my teeth in."

"Check," said Ross.

They stopped at a nursery where Cargraves ordered three dozen young rhubarb plants. He planned to use a balanced oxygen-carbon-dioxide air-refreshing system during the stay on the moon, if possible, and the plants were to supply the plantlife half of the cycle. Enough liquid oxygen would be carted along for breathing throughout the round trip, but a "balanced aquarium" arrangement for renewing their air supply would enable them to stay on the moon as long as their food lasted.

The chemical fertilizers needed for hydroponic farming of the rhubarb were ordered also. This done, they grabbed a chocolate malt and a hamburger apiece and high-tailed it for the camp.

Morrie and Art swarmed out of the machine shop as they arrived. "Hi, Doc!

Hi, Ross! What's the good word?"

Ross showed them the guns. Art was eager to try them and Cargraves okayed it. Morrie hung back and said, "By the way, Doc, the CAB inspector was here today."

"The what?"

"The Civil Aeronautics inspector. He had a letter from you."

"From me? What did it say?"

"Why, it requested them to send an inspector to go over the rebuilt parts of the rocket and approve it for flight. I told him it wasn't ready." "What else did you say? Did you tell him it was atomic-powered?"

"No, but he seemed to know it. He knew that we planned a space flight, too. What's the pitch, Doc? I thought you were going to keep it quiet a while longer?"

"So did I," Cargraves said bitterly. "What did you tell him?"

"Nothing—so help me. I decided you ought to handle it, so I played stupid. I tipped Art and he did the same. Did we do wrong?" he went on anxiously. "I know he was CAB, but it seemed to me he ought to talk to you. Do you suppose we offended him?"

"I hope you gave him apoplexy," Cargraves said savagely. "He was no CAB inspector, Morrie. He was a phony."

"Huh? Why... . But he had your letter."

"Faked. I'll bet he's been holed up somewhere outside the gate, waiting for me to be away. Did you leave him alone at any time?"

"No. Wait a minute—only once, for about five minutes. We were down at the ship and he sent me back for a flashlight. I'm sorry." The boy looked miserable.

"Forget it. It was the natural, polite thing to do. You didn't know he was phony. I wonder how he got through the gate? Did he come in a car?"

"Yes. I... Was the gate locked?"

"Yes, but he might have bulldozed the forester into letting him in." They had been moving down toward the ship as they talked. Cargraves made a quick examination of the ship, but found nothing amiss. It seemed likely that the intruder had not found what he was looking for, probably because the drive was not yet installed.

He still worried about the matter of the locked gate. "I'm going to run down to the gate," he announced, heading for the car. "Tell the boys." "I'll drive you." None of the boys approved the way Cargraves drove a car; it was one respect in which they did not look up to him. Privately, they considered his style stuffy.

"Okay. Snap it up."

Morrie ran down toward where the other two were wasting ammunition on innocent tin cans and bellowed at them. Seconds later he had the engine revved up and was ready to gun the rig when Cargraves slid into the seat beside him.

The padlock was intact, but one link of the bullchain had been hack-sawed away and replaced with wire. "So that's that," Cargraves dismissed the matter.

"Hadn't we better put on a new chain?" inquired Morrie.

"Why bother? He's still got the hacksaw."

The trip back was gloomy. Cargraves was worried. Morrie felt responsible for not having unmasked and made prisoner the impostor. In retrospect he could think of a dozen dramatic ways to have done it. Cargraves told him to keep his lip buttoned until after supper. When the dishes were out of the way, he brought the others up to date on the ominous happenings. Art and Ross took it with grave faces but without apparent excitement. "So that's how it is," Ross said. "Seems like somebody doesn't like us."

"Why that dirty so-and-so," Art said softly. "I thought he was too smooth.

I'd like to have him on the other end of one of those Garands."

"Maybe you will," Cargraves answered him soberly. "I might as well admit, fellows, that I've been worried... ."

"Shucks, we knew that when you ordered that watch-dog hook-up."

"I suppose so. I can't figure out why anybody would do this. Simple curiosity I can understand, once the fact leaked out- as it seems to have done -that we are after space flight. But whoever it is has more than curiosity eating him, considering the lengths he is willing to go to."

"I'll bet he wants to steal your space drive, Uncle Don."

"That would make a swell adventure yarn, Art; but it doesn't make sense. If he knows I've got a rocket drive, all he has to do is apply for a license to the commission and use it."

"Maybe he thinks you are holding out some secrets on the commission?"

"If he thinks so, he can post a bond for the costs and demand an examination. He wouldn't have to fake letters, or bust open gates. If he proves it on me, I go to jail."

"The point is," Morrie asserted, "not why he's snooping but what we can do to stop him. I think we ought to stand watches at night." He glanced at the two rifles.

"No," Cargraves disagreed. "Art's squawk circuit is better than a guard. You can't see enough at night. I found that out."

"Say," put in Art. "Look—I could take the pilot radar and mount it on the roof of the cabin. With it set to scan for a landing it'll pick up anything in the neighborhood."