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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 Panner. He placed the watch on the table, and they ate silently.
Panner lifted the watch again. "A little under a min-ute. It should be completely automatic." Although
the chief engineer spoke calmly enough, the hand that held the watch trembled very slightly.
Panner said, "Now," and there was silence. Complete silence.
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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 grav-itational field.
Panner said, "On the nose! Perfect!" He put away his watch, and though the smile on his broad,
homely face was a restrained one, it virtually shouted relief. "We're actually on an Agrav ship now in full
Agrav operation."
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."
Panner's eyes narrowed at the sudden gravity in Lucky's voice. "Had to be?"
"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
Panner stared blankly. Then, "Why?"
"The Sirians would certainly want to know how the ship actually worked. If their method of spying is
fool-proof, 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 Panner.
"I admit it," said Lucky. "There is an alternative."
"Which is?"
"That the humanoid robot is aboard as a stowaway."
"Very unlikely," said Panner.
"But quite possible. It might easily have boarded the
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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."
Panner thought about it. "Not as much room as you might think."
"Still we must search the ship. Will you do that, Dr. Panner?"
"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. Panner, we have still gained something. We'll know we can restrict our
con-sideration to the men legally aboard ship."
"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. Panner. Are you willing to help us search the
ship? I am asking your help in my capacity as a member of the Council of Science."
Reluctantly Panner got to his feet. "I suppose I must then."
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 struc-tures 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
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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.
Panner nodded and said in a low voice, "Everything is as automatic as possible. The need for human
inter-vention has been cut to the minimum."
"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."
Panner moved ahead, guiding them through the narrow openings but moving always slowly as though
at any moment he expected someone, or some thing, to hurl itself murderously upon them.
Level by level, methodically moving out from the central shaft along the side channels, Panner probed
each bit of room with the sureness of the expert.
Eventually they came to a halt at the very bottom, hard against the large tail jets through which the
glow-ing 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 Panner.
"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
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to it and there've been a number of those till an hour ago. No, the jets are out."
"Well, then," said Panner, "there's no one anywhere in the engine compartments. No thing, either."
"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."
Panner said, "Don't forget me. I disobeyed an order. That leaves ten."
"That raises an interesting point," said Lucky. "Do you know anything about robotics?"
"I?" said Panner. "Never dealt with a robot in my life."
"Exactly," said Lucky. "Earthmen invented the positronic robot and developed most of the refinements, yet,
except for a few specialists, the Earth technician knows nothing about robotics, simply because we don't
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