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"Thank you," Lucky said. "It's kind of you to invite us."
"Well," said Pa
"Aren't you leery of me, Dr. Pa
"Of course not. You tested me, remember, and I passed."
Pa
If ever the ancient belief of the "music of the spheres" could be said to have come literally true, it was in that hum of hyperatomics that was the very essential of space flight.
Pa
Lucky said, "That means we're in free fall down to Jupiter."
"With fifteen million miles to fall, yes. Once we've piled up enough velocity to make it worthwhile, we'll shift to Agrav."
, He took a watch out of his pocket as he spoke. It was a large disc of gleaming, featureless metal. He pressed a small catch, and luminous figures appeared upon its face. A glowing line of white encircled it, turning red in a sweeping arc until the redness closed in upon itself and the arc turned white again.
Lucky said, "Are we scheduled to enter Agrav so soon?"
"Not very long," said Pa
Pa
Pa
The hum of the hyperatomics had stopped. The very power to keep the ship's lights on and its pseudo-grav field in operation were now coming from Jupiter's gravitational field.
Pa
Lucky was smiling, too. "Congratulations. I'm pleased to be on board."
"I imagine you are. You worked hard enough for it. Poor Donahue."
Lucky said gravely, ''I'm sorry I had to push the commander so hard, but I had no choice. One way or another, I had to be on board."
Pa
"Had to be! It seems almost certain to me that on board this ship at the present moment is the spy we're looking for."
10. In the Vitals of the Ship
Pa
"The Sirians would certainly want to know how the ship actually worked. If their method of spying is foolproof, as it has been till now, why not continue it on board the ship?"
"What you're saying, then, is that one of the fourteen men on board the Jovian Moon is a robot?"
"That is exactly what I mean."
"But the men aboard ship have been chosen long since."
"The Sirians would know the reasons for choosing and the method of choice just as they know everything else about the project and they would maneuver their humanoid robot so as to have him chosen."
"That's giving them a lot of credit," muttered Pa
"I admit it," said Lucky. "There is an alternative."
"Which is?"
"That the humanoid robot is aboard as a stowaway."
"Very unlikely," said Pa
"But quite possible. It might easily have boarded the ship in the confusion before the commander made his christening speech. I tried to watch the ship then, but it was impossible. Furthermore, nine tenths of the ship seems to be made up of engine compartment, so there must be plenty of room to hide."
Pa
"Still we must search the ship. Will you do that, Dr. Pa
"I?"
"Certainly. As chief engineer, you would know the contents of the engine compartment better than anyone else. We'll go with you."
"Wait. It's a fool's errand."
"If there is no stowaway, Dr. Pa
"Just three of us?"
Lucky said quietly, "Whom can we trust to help us, when anyone we might ask might be the robot we're looking for? Let us not discuss this any further, Dr. Pa
Reluctantly Pa
They clambered down the hand holds of the narrow shaft leading to the first engine level. The light was subdued and, naturally, indirect, so that the huge structures on either side cast no shadow.
There was no sound, no slightest hum to indicate activity or to show that vast forces were being trapped and dealt with. Bigman, looking about, was appalled to find that nothing seemed familiar; that of the ordinary workings of a space ship, such as that of their own Shooting Starr, nothing seemed left.
"Everything's closed in," he said.
Pa
"What about repairs?"
"There shouldn't have to be any," the engineer said grimly. "We have alternate circuits and duplicated equipment at every step, all allowing for automatic cut-in after self-check."
Pa
Level by level, methodically moving out from the central shaft along the side cha
Eventually they came to a halt at the very bottom, hard against the large tail jets through which the glowing hyperatomic forces (when the ship was in ordinary flight) pressed backward to push the ship forward.
From within the ship the test jets showed as four smooth pipes, each twice as thick as a man, burrowing into the ship and ending in the tremendous featureless structures that housed the hyperatomic motors.
Bigman, said, "Hey, the jets! Inside!"
"No," said Pa
"Why not? A robot could hide there fine. It's open space, but what's that to a robot?"
"Hyperatomic thrusts," said Lucky, "would be plenty to it and there've been a number of those till an hour ago. No, the jets are out."
"Well, then," said Pa
"You're sure?"
"Yes. There isn't a place we haven't looked, and the route I followed made it impossible for anything to get around and behind us."
Their voices made small echoes in the lengths of shafts behind them.
Bigman said, "Sands of Mars, that leaves us with the fourteen regulars."
Lucky said thoughtfully, "Less than that. Three of the men aboard ship showed emotion: Commander Donahue, Harry Norrich, Red Summers. That leaves eleven."
Pa