"Commander!" Crag came to with a start Prochaska was leaning over him. Urgency was written across his face.

"Come quick!" The Chief stepped back and motioned with his head toward the instrument corner. Crag sprang to his feet with a sense of alarm. Richter and Larkwell were still asleep. He glanced at the master chrono, 0610, and followed him into the electronics corner. Nagel was standing by the scope, a frightened look on his face.

"What's up?"

"Nagel woke me at six. I came in to get ready for Drone Baker ...."

"Get to the point," Crag snapped irritably.

"Sabotage." He indicated under the panel. "All the wiring under the main console's been slashed."

Crag felt a sense of dread. "How long will it take to make repairs?"

"I don't know—don't know the full extent of the damage."

"Find out," Crag barked. "How about the communicator?"

"Haven't tried it," Prochaska admitted. "I woke you up as soon as I found what had happened." He reached over and turned a knob. After a few seconds a hum came from the console. "Works," he said.

"See how quickly you can make repairs," Crag ordered. "We've got to hook onto the drone pretty quick."

He swung impatiently toward Nagel. "Was anyone up during your watch? Did anyone go to the commode?"

Nagel said defensively: "No, and I was awake all the time." Too defensive, Crag thought. But no one had stirred during his watch. Therefore, the sabotage had occurred between midnight and the time Nagel wakened Prochaska. But, wait ... Prochaska could have done the sabotage in the few moments he was at the console after Nagel woke him. It would have taken just one quick slash—the work of seconds. That left him in the same spot he'd been in with regard to the time bomb.

He grated harshly at Nagel: "Wake Larkwell and get on with the airlock. And don't chatter about what's happened," he added.

"I won't," Nagel promised nervously. He retreated as if glad to be rid of Crag's scrutiny.

"A lousy mess," Prochaska grunted.

Crag didn't answer.

"If we don't solve this, we're going to wind up dead," he pursued.

Crag turned and faced him. "It could be anybody. You ... me."

"Yeah, I know." The Chief's face got a hard tight look. "Only it isn't ... it isn't me."

"I don't know that," Crag countered.

Prochaska said bitterly: "You'd better find out."

"I will," Crag said shortly. He got on the communicator. It took several minutes to raise Alpine. He wasn't surprised when Gotch answered, and briefly related what had happened.

"Is there any possibility of telemetering her all the way in?" He knew there wasn't, but he asked anyway.

"Impossible."

"Okay, well try and make it from here."

The Colonel added a few comments. They were colorful but definitely not complimentary. He got the distinct impression the Colonel wasn't pleased with events on the moon. When his cold voice faded from the communicator, Crag tried the analog. The grid scope came to life but it was blank. Of course, he thought, Drone Baker was cut off from earth by the body of the moon. It could not be simulated on the analog until it came from behind the blind side where the earth saucers could track its flight.

"Morning," Larkwell said, sticking his head around the curtain. "How about climbing into your suits so we can get out of this can?" Crag studied his face. It seemed void of any guile. Nagel stood nervously behind him.

"Okay," Crag said shortly. He hated to have Prochaska lose the precious moments. They hurriedly donned their suits and Nagel decompressed the cabin, Larkwell opened the hatch and they left. Crag closed it after them and released fresh oxygen into the cabin. Richter took off his suit and returned to his corner. His eyes were bright with interest. He knows, Crag thought.

At 0630 the communicator came to life. A voice at the other end gave Drone Baker's position and velocity as if nothing had happened. The drone, on the far side of the moon, was decelerating, dropping as servo mechanisms operating on timers activated its blasters. It was guided solely by the radio controlled servos, following a flight path previously determined by banks of computers. Everything was in apple-pie order, except for the snafu in Arzachel, Crag thought bitterly.

Prochaska worked silently, swiftly. Crag watched with a helpless feeling. There wasn't room for both of them to work at one time. The Chief's head and arms literally filled the opening of the sabotaged console. Once he snapped for more light and Crag beamed a torch over his shoulder, fretting from the inaction.

Sounds came through the rear bulkhead where Larkwell and Nagel were working in the tail section. Strange, Crag thought, to all appearances each crew member was a dedicated man. But one was a traitor. Which one? That's what he had to find out. Richter would have been the logical suspect were it not for the episode of the time bomb. No, it hadn't been the German. It was either the competent Prochaska, the sullen Nagel or the somehow cheerful but inscrutable Larkwell. But there should be a clue. If only he knew what to look for. Well, he'd find it. When he did ... He clenched his fists savagely.

At 0715 Alpine simulated the drone on the analog. Fifteen minutes later Prochaska pulled his head from the console and asked Crag to try the scope. It worked.

"Now if I can get those damn wires that control the steering and braking rockets ..." He dived back into the console. Crag looked at the chrono, then swung his eyes to the instruments. Drone Baker was coming in fast. The minutes ticked off. The communicator came to life with more data. Baker was approaching Ptolemaeus on its final leg. The voice cut off and Gotch came on.

"We're ready to transfer control."

Prochaska shook his head negatively without looking up.

"What's the maximum deadline?" Crag asked.

"0812, exactly three minutes, ten seconds," Gotch rasped. Prochaska moved his head to indicate maybe. The communicator was silent. Crag watched the master chrono.

At 0812 Prochaska was still buried in the panel. Crag's dismay grew—dismay and a sense of guilt over the sabotage. Gotch had warned him against the possibility innumerable times. Now it had happened. The loss of Drone Able had been a bad blow; the loss of Baker could be fatal, not only to the success of their mission but to their survival.

Survival meant an airlock and the ability to live on their scant supplies until Arzachel was equipped to handle incoming rockets on a better-than-chance basis. Well, one thing at a time, he thought. He suppressed the worry nagging at his mind. Just now it was Drone Baker's turn at bat.

At 0813 Prochaska sprang to his feet and nodded. Crag barked an okay into the communicator while the Chief got his bearings on the instruments. Crag hoped the lost minute wouldn't be fatal. By 0814 Prochaska had the drone under control. It was 90,000 feet over Alphons traveling at slightly better than a thousand miles per hour. He hit the braking rockets hard.

"We're not going to make it," he gritted. He squinted his eyes. His face was set, grim.

"Hold it with full braking power."

"Not sufficient fuel allowance."

"Then crash it as close as possible."

Prochaska nodded and moved a control full over. The drone's braking rockets were blasting continuously. Crag studied the instruments. It was going to be close. By the instrument data they couldn't make it. Drone Baker seemed doomed. It was too high, moving too fast despite the lavish waste of braking power. His hand clenched the back of Prochaska's seat. He couldn't tear his eyes from the scope. Baker thundered down.

Suddenly the drone was on them. It cleared the north rim of Arzachel at 3,000 feet. Too high, Crag half-whispered. The difference lay in the lost minute. Prochaska pushed and held the controls. Crag pictured the rocket, bucking, vibrating, torn by the conflict of energies within its fragile body.

Prochaska fingered the steering rockets and pushed the drone's nose upward. Crag saw it through the port. It rushed through space in a skidding fashion before it began to move upward from the face of the moon. Prochaska hit the braking jets with full power. Crag craned his head to follow its flight. Out of one corner of his eye he saw Nagel and Larkwell on the plain, their helmeted heads turned skyward. He scrunched his face hard against the port and caught the drone at the top of its climb.

It was a slender needle with light glinting on its tail—the Sword of Damocles hanging above their heads. It hung ... suspended in space ... then began backing down, dropping stern first with flame and white vapor pouring from its tail jets. It came fast. Occasional spurts from radial jets around its nose kept its body perpendicular to the plain. Vapor from the trail fluffed out hiding the body of the rocket. The flame licked out while the rocket was still over a hundred feet in the air.

Prochaska cursed softly. The rocket seemed riveted to the black sky for a fraction of a second before it began to fall. Faster ... faster. It smashed into the lunar surface, lost from sight.

"Exit Baker," Prochaska said woodenly. Quietly Crag got on the communicator and reported to Gotch. There was a brief silence when he had finished.

Finally Gotch said, "Drone Charlie will be launched on schedule. We'll have to reassess our logistics, though. Maybe we'd better knock off the idea of the airlock-in-the-gully idea and shoot along extra oxygen and supplies instead. How does the meteorite problem look?"

"Lousy," said Crag irritably. "We've had a scary near miss. I wouldn't bet on being able to survive too long in the open. Again there was a silence.

"You'll have to," Gotch said slowly, "unless you can salvage Baker's cargo."

"We'll check that."

"You might investigate the possibility of covering the Aztec with ash."

"Sure ... sure," Crag broke in. "Good idea. I'll have the boys break out the road grader immediately."

"Don't be facetious," Gotch reprimanded. "We have a problem to work out."

"You're telling me!"

"In the meantime, try and clean up that other situation."

By "other situation" Crag knew he was referring to the sabotage. Sure, be an engineer, intelligence agent, spaceman and superman, all rolled into one. He wrinkled his face bitterly. Still he had to admire the Colonel's tenacity. He was a man determined to conquer the moon.

"Will do," Crag said finally. "In the meantime we'll look Baker over. There might be some salvage."

"Do that," the Colonel said crisply. He cut off.