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"He's getting less energy, too," said Russ. "We're retreating from his main sources of energy, the Sun and Jupiter. Almost the speed of light and that would cut down his energy intake terrifically. He has to use what he's got in his accumulators, and after that last blast at us, they must be nearly drained."

As Russ watched, the speed needle fell off slightly. Russ held his breath. It edged back slowly, creeping. The speed was being cut down.

"Craven is using whatever power he has," he said. "They're alive back there, all right. He's trying to catch hold of Jupiter and make its gravity work for him."

The Invincible felt the strain of the other ship now. Felt it as Craven poured power into his drive, fighting to get free of the invisible hawser that had trapped him, fighting against being dragged into outer space at the tail-end of a mighty craft heading spaceward with frightening speed.

Girders groaned in the Invincible, the engines moaned and throbbed. The speed needle fell back, creeping down the dial, slowly, unwillingly, resisting any drop in speed. But Craven was cutting it down. And as he cut it, he was able to absorb more energy with his collector lens. But he was fighting two things ... momentum and the steadily decreasing gravitational pull of Jupiter and the Sun. The Sun's pull was dwindling slowly, Jupiter's rapidly.

The needle still crept downward.

"What's his point of equality to us?" demanded Greg. "Will we make it?"

Russ shook his head. "Won't know for hours. He'll be able to slow us up ... maybe he'll even stop us or be able to jerk free, although I doubt that. But every minute takes him farther away from his main source of power, the Solar System's radiation. He could collect power anywhere in space, you know, but the best place to collect it is near large radiant bodies."

Russ continued to crouch over the dial, begrudging every backward flicker of the needle.

This was the last play, the final hand. If they could drag Craven and his ship away from the Solar System, maroon him deep in space, far removed from any source of radiation, they would win, for they could go back and finish the work of smashing Interplanetary.

But if Craven won—if he could halt their mad dash for space, if he could shake free—they'd never have another chance. He would be studying that field they had wrapped around him, be ready for it next time, might even develop one like it and use it on the Invincible. If Craven could win his way back to the Sun, he would be stronger than they were, could top them in power, shatter all their plans, and once again the worlds would bow to Interplanetary and Spencer Chambers.

Russ watched the meter. The speed was little more than ten miles a second now and dropping rapidly. He sat motionless, hunched, sucking at his dead pipe, listening to the thrumming of the generators.

"If we only had a margin," he groaned. "If we just had a few more horsepower. Just a few. But we're wide open. Every engine is developing everything it can!"

Greg tapped him on the shoulder, gently. Russ turned his head and looked into the face of his friend, a face as bleak as ever, but with a hint of smile in the corners of the eyes.

"Why not let Jupiter help us?" he asked. "He could be a lot of help."

Russ stared for a moment, uncomprehending. Then with a sob of gladness he reached out a hand, shoved over a lever. Mirrors of anti-entropy shifted, assumed different angles, and the Invincible sheered off. They were no longer retreating directly from the Sun, but at an angle quartering off across the Solar System.

Greg grinned. "We're falling behind Jupiter now. Letting Jupiter run away from us as he circles his orbit, following the Sun. Adds miles per second to our velocity of retreat, even if it doesn't show on the dial."

The cosmic tug of war went on, grimly—two ships straining, fighting each other, one seeking to escape, the other straining to snake the second ship into the maw of open, hostile space.

The speed was down to five miles a second, then a fraction lower. The needle was flickering now, impossible to decide whether it was dropping or not. And in the engine rooms, ten great generators howled in their attempt to make that needle move up the dial again.

Russ lit his pipe, his eyes not leaving the dial. The needle was creeping lower again. Down to three miles a second now.

He puffed clouds of smoke and considered. Saturn fortunately was ninety degrees around in his orbit. On the present course, only Neptune remained between them and free space. Pluto was far away, but even if it had been, it really wouldn't count, for it was small and had little attraction.

In a short while Ganymede and Callisto would be moving around on the far side of Jupiter and that might help. Everything counted so much now.