Lucky said, "Think back, Dr. Peverale, on the night of the banquet and of your own words concerning the Sirian robots… By the way, Dr. Peverale, you've known for a long time there was a robot on the planet, haven't you?"
The astronomer said uneasily, "What do you mean?"
"Dr. Mindes came to you with stories of having sighted moving manlike figures in what seemed like metal space-suits who also seemed to endure solar radiation better than one would expect humans to."
"I certainly did," interposed Mindes, "and I should have known I was seeing a robot."
"You didn't have the experience with robots that Dr. Peverale did," said Lucky. He turned to the old astronomer again. "I'm sure that you suspected the existence of Sirian-designed robots on the planet as soon as Mindes reported what he had seen. His description fit them perfectly."
The astronomer nodded slowly.
"I, myself," Lucky went on, "did not suspect robots when Mindes told me his story any more than he himself did. After the banquet, however, when, Dr. Peverale, you discussed Sirius and its robots, the thought occurred to me very forcefully that here was the explanation. You must have thought so too."
Dr. Peverale nodded slowly again. He said, "I realized that we ourselves could do nothing against a Sirian incursion. That is why I discouraged Mindes."
(Mindes turned pale at this point and muttered savagely to himself.)
Lucky said, "You never reported to the Council of Science?"
Dr. Peverale hesitated. "I was afraid they wouldn't believe me and that I would only succeed in getting myself replaced. Frankly, I didn't know what to do. It was obvious that I could make no use of Urteil. He was interested only in his own plans. When you came, Starr," his voice grew deeper, more flowing, "I felt I might have an ally at last, and for the first time I felt able to talk about Sirius, its dangers, and its robots."
"Yes," said Lucky, "and do you remember how you described the Sirian affection for their robots? You used the word 'love.' You said the Sirians pampered their robots; they loved them; nothing was too good for them. You said they would regard a robot as worth a hundred Earthmen."
"Of course," said Dr. Peverale. "That's true."
"Then if they loved their robots so much, would they send one of them to Mercury, uninsulated, un-adapted to Solar radiation? Would they condemn one of their robots to a slow, torturing death by the Sun?"
Dr. Peverale fell silent, his lower lip trembling.
Lucky said, "I, myself, could scarcely think of blasting the robot even though it endangered my life, and I am no Sirian. Could a Sirian have been so cruel to a robot, then?"
"The importance of the mission… " began Dr.
Peverale.
"Granted," said Lucky. "I don't say a Sirian wouldn't send a robot to Mercury for purposes of sabotage, but, Great Galaxy, they would have insulated its brain first. Even leaving their love for robots out of account, it's only good sense. They could get more service out of it."
There was a murmur of approval and agreement from the assemblage.
"But," stammered Dr. Peverale, "if not the Sirians then who… "
"Well," said Lucky, "let's see what leads we have. Number one. Twice Mindes spotted the robot, and twice it vanished when Mindes tried to draw close. The robot later informed me that it had been instructed to avoid people. Obviously, it had been warned that Mindes was out searching for the saboteur. Obviously, too, it must have been warned by someone inside the Dome. It wasn't warned against me, because I announced that I was going into the mines.
"Lead number two. As the robot lay dying, I asked once more who had given it its instructions. It could only say, 'Er-er… ' Then its radio blanked out, but its mouth moved as though it were making two syllables."
Bigman shouted suddenly, his pale red hair standing on end with passion, "Urteil! The robot was trying to say Urteil! That filthy cobber was the saboteur all the time. It fits in! It fits… "
"Maybe," said Lucky, "maybe! We'll see. It struck me as a possibility that the robot was trying to say, 'Earthman.'"
"And maybe," said Peverale dryly, "it was only a vague sound made by a dying robot and it meant nothing at all."
"Maybe," agreed Lucky. "But now we come to lead number three and it is instantly conclusive. That is this: The robot was of Sirian manufacture, and what human here at the Dome could possibly have had a chance to gain possession of a Sirian robot? Have any of us been on the Sirian planets?"
Dr. Peverale's eyes narrowed. "I have."
"Exactly," said Lucky Starr, "and no one else. That's your answer."
Mad confusion followed and Lucky called for silence. His voice was authoritative and his face stern. "As a Councilman of Science," he said, "I declare this observatory to be in my charge from this moment on. Dr. Peverale is replaced as director. I have been in communication with Council Headquarters on Earth, and a ship is on its way now. Appropriate action will be taken."
"I demand to be heard," cried Dr. Peverale.
"You will be," said Lucky, "but first listen to the case against you. You are the only man here who had the opportunity to steal a Sirian robot. Dr. Cook told us that you were awarded a robot for personal service during your stay on Sirius. Is that correct?"
"Yes, but… "
"You directed him into your own ship when you were through with him. Somehow you managed to evade the Sirians. Probably they never dreamed anyone could commit so horrible a crime, to them, as robot-stealing. They took no precautions against it for that reason, perhaps.
"What's more, it makes sense to suppose the robot was trying to say, 'Earthman' when I asked him who had given it instructions. You were the one Earthman on Sirius. You would be spoken of as 'Earthman' when the robot was first placed in your service, probably. It would think of you as 'Earthman.'
"Finally, who would know better when anyone might be exploring the Sun-side? Who would better inform the robot by radio when it might be safe and when it ought to go into hiding?"
"I deny everything," said Dr. Peverale tightly.
"There's no point in denying it," said Lucky. "If you insist on your innocence, the Council will have to send to Sirius for information. The robot gave me its serial number as RL-726. If the Sirian authorities say that the robot assigned to you during your stay on Skius was RL-726 and that it disappeared about the time you left Sirius, that will condemn you.
"Furthermore, your crime of robot-stealing was committed on Sirius, and because we have an extradi-' tion treaty with the Sirian planets we may be forced to release you into their custody. I would advise you, Dr. Peverale, to confess and let Earth's justice take its course, rather than to maintain innocence and risk what Sirius might do for your crime of having stolen one of their beloved robots and tortured it to death."
Dr. Peverale stared pitifully at the assemblage with unseeing eyes. Slowly, joint by joint, he collapsed and dropped to the floor.
Dr. Gardoma rushed to his side and felt for his heart. "He's alive," he said, "but I think he'd better be moved to bed."
Two hours later, with Dr. Gardoma and Lucky Starr at his bedside and with Council Headquarters in sub-etheric contact, Dr. Lance Peverale dictated his confession.
With Mercury falling rapidly behind and the sure knowledge that Council emissaries now had the situation in hand, relieving him of any feeling of responsibility, Lucky still felt tension. His expression was brooding and thoughtful.
Bigman, face puckered anxiously, said, "What's the matter, Lucky?"
"I'm sorry for old Peverale," said Lucky. "He meant well in his way. The Sirians are a danger, if not quite as immediate as he thought."
"The Council wouldn't have turned him over to Sirius, would it?"
"Probably not, but his fears of Sirius were sufficiently great to force his confession. It was a cruel trick, but necessary. However patriotic his motives, he had been forced into attempted murder. Cook, too, was goaded into his crime, yet it was none the less a crime, however little we think of Urteil."