"All set, Astro!" shouted Strong. "Right on course. Now pile on the neutrons!"

"Aye, aye, sir."

On the power deck, the big cadet turned to his control panel, took a deep breath, and opened the reactant feeders wide. The ship leaped through the airless void under the sudden burst of power and Astro watched the acceleration indicator climb to the danger line. He gulped as the needle pa.s.sed the danger point and was about to cut down speed when the needle stopped. Astro breathed easily and settled back satisfied. If it was up to him, they would reach Tom in record time.

Up on the radar deck, Roger continued to read the flashing signals on the radar scanner. Over and over, he read the same message.

"I guess that's all he can say, sir," said Roger, turning to Strong.

"Yes, I guess so, Roger," agreed Strong. "He's probably sending it out blind, on an open circuit, hoping that anyone near enough would pick it up. Wonder how he did it?"

Roger thought a moment. "I'm not sure, sir, but I think he's crossed the impulse on the scanner from positive to negative."

"How do you mean?" asked Strong. The young captain was well acquainted with the principle of radar but, admittedly, could not match Roger's natural ability.

"By making the impulse negative, sir," said Roger, "he could create interference on the scanner. Instead of bouncing against something and returning an image to a scanner, the impulse hits itself and creates static which shows up in the form of those white flashes."

"Well, in any case," said Strong with a sober nod toward the scanner, "he's done something the whole Solar Guard couldn't do. He's quite a boy!"

Roger smiled. "I'll say he is, skipper!"

Strong turned away and climbed down to the control deck. He sat in front of the great control panel and watched the countless dials and needles.

But his mind wasn't on the delicate handling of the great ship. He was thinking about Tom, alone aboard a ship with a crew of desperate criminals.

Tom had taken his life in his hands to send out the message, that much Strong was sure of! And the young skipper noted with pride that there was no appeal for help in the desperate call.

He shook his head wearily and flipped the teleceiver switch to report to Commander Walters.

"Emergency ... attention...." Tom continued to tap out the message slowly and carefully. Behind him, he could hear Brooks hammering against the locker door. Tom felt like opening the door and freezing the pirate with his paralo-ray gun to keep him quiet, but he didn't dare to stop sending.

Finally Tom decided it was time to go. "If anyone's going to pick up the message," he thought, "they've picked it up by now. I may still have time to get away in a jet boat."

He tied the wires together, causing a continuous interference to be sent out, and secured the radar casing. "If I'm lucky enough to get away in a jet boat," thought Tom, "at least they won't be able to pick me up on that!"

Without a glance at the locker where Brooks continued to pound and yell, Tom turned to the hatch leading to the pa.s.sageway. He gripped the paralo-ray gun and opened the hatch. Peering into the pa.s.sageway and finding it deserted, he slipped out and closed the hatch behind him.

From below, he could hear the roar of the crew as the last of them received his share of the stolen credits.

Tom raced down the companionway toward the jet-boat deck. He made the first deck safely and was about to climb down to the next when he was spotted by Attardi, the scar-faced s.p.a.ceman, who stood at the bottom of the ladder.

"Hey, Kid!" Attardi shouted. "The skipper's been looking for ya. You got the biggest cut. Three thousand credits for that fancy shooting you did!"

Tom noticed the gleam of the knife at the man's side. The young cadet could imagine the criminal sinking the knife in his back without hesitation, if he suspected anything.

"Well," demanded Attardi, "are you going to collect or not? The skipper sent me to look for you."

Tom smiled, and while still smiling, whipped the paralo-ray gun into sight and fired. His aim was true. Attardi froze, every nerve in his body paralyzed. He could still breathe and his heart continued to beat, but otherwise, he was a living statue, unable to even blink his eyes.

Tom jumped past the s.p.a.ceman and dashed for the jet-boat deck. He had to hurry now. Attardi would be discovered any moment and be neutralized.

When neutralized, the victim returned to normal, with only violent muscle soreness remaining.

Tom reached the jet-boat deck, opened the hatch, and raced for the nearest small craft. Suddenly from behind he could hear the buzz of a paralo-ray on neutralizing charge. Attardi had been discovered.

Tom jumped into the nearest jet boat, closed the hatch, and pressed the b.u.t.ton releasing the sliding side of the ship's hull. Slowly, the great wall of metal slid back exposing the cold black velvet of deep s.p.a.ce. As soon as the opening was wide enough, Tom pressed the acceleration lever and the small ship shot out, its jets roaring.

Tom quickly glanced around to locate his position by the stars and saw that he was close to the asteroid belt. He opened up to full acceleration, and since there was nothing else to do but wait for time to pa.s.s and hope for escape, he began to examine the contents of the small ship. He opened the emergency food locker and was relieved to see it fully stocked with synthetics and water. Every second carried him farther away from the _Avenger_, and when he looked back, Tom saw no evidence of pursuit. The cadet smiled. They would depend on the radar to find him, instead of sending out the other jet boats. Tom almost laughed out loud. With the radar jammed, he was safe. He would make it. Once inside the asteroids, they would never find him.

Glancing around the few indicators on the control board of the small vessel, Tom's smile changed to a grimace of sudden terror. The jet boat had not been refueled after their raid on the jet liner. There was less than three days' oxygen remaining in the tanks. In three days the jet boat would become an airless sh.e.l.l. A vacuum no different than the cold silent void of s.p.a.ce!

CHAPTER 15

"What's our position, Roger?" Captain Strong called into the intercom.

"s.p.a.ce quadrant B, section twenty-three, sir," replied Roger from the radar bridge. "But I can't see a thing on the radar. That static flash Tom sent out is scrambling everything."

"But you're sure this is our position?"

"Yes, sir. I checked it three times."

"All right, then," said Strong grimly. "There's only one thing to do.

We're too near the asteroid belt to use the _Polaris_ without radar, so we'll search in jet boats. Astro! We're parking right here! Give me full braking rockets and secure the power deck. Then prepare the jet boats for flight."

"Aye, aye, sir," came the reply from the Venusian.

The ship bucked under the tremendous power of the braking rockets and came to a dead stop in s.p.a.ce. Strong dashed up the ladder to the radar bridge where Roger was still hunched before the radar scanner.

"Any chance of switching the scanner to another frequency and offsetting the effects of the static, Roger?" asked the Solar Guard captain.

Roger shook his head. "I don't think so, sir. The interference would have to be eliminated at its source."

"Well," sighed Strong, "to go looking for Tom without the help of radar would be like looking for an air bubble in the ammonia clouds of Jupiter. And we don't even know if he's still aboard the _Avenger_ or not!"

"You know, sir," said Roger speculatively, "I've been thinking. I might be able to get a fix on this interference."

"A fix? How?"

"By blanking out the radar range, so that it would only work at one point of the compa.s.s at one time, then testing each heading separately until the flash appears. When it does, we'd at least know in which direction to blast off and trail c.o.xine.

"If you can do that, Roger," exclaimed Strong, "it would take us right into c.o.xine's lap! Do you think you can work it?"

"I can try, sir."

"All right, then," decided Strong. "Astro and I will take the jet boats and go looking around. Meantime, you stay aboard and try to pin point the heading on that flash."