"Exactly," said Lucky, "and there was no obvious reason why that should be, as in Mindes's case, for instance. I thought there might be some reason I knew nothing about."

"Is that what put you on to him first, Lucky?" "No, it was something else. It was the slashed inso-suit in our own room. The man with the best opportunity to do that was obviously Peverale himself. He also would be in the best position to dispose of the suit after it had killed its man. He best knew our assigned room, and he could assign an inso-suit too. What bothered me, though, was the motive? Why should he want to kill me?

"My name apparently meant nothing to Mm. He asked if I were a sub-temporal engineer like Mindes the first time we met. Now Mindes had recognized my name and tried to get me to help him. Dr. Gardoma had heard of me in connection with the poisonings on Mars. Urteil knew all about me, of course. I wondered if Dr. Peverale might not have heard of me too.

"There was Ceres, for instance, where you and I stayed a while during the battle against the pirates. The largest observatory in the System is there. Might not Dr. Peverale have been there then? I asked him that, and he denied having met me there. He admitted that he visited Ceres, and Cook later told us the old man visited Ceres frequently. Peverale went on to explain, without any prompting from me, that he had been sick in bed during the pirate raid, and Cook later backed that statement. That was the giveaway. In his anxiety, Peverale had talked too much." The little Martian stared. "I don't get that." "It's simple. If Peverale had been on Ceres a number of times, how was it he felt it necessary to alibi that particular time when the pirates had attacked?

Why that time and not another? Obviously, he knew on which occasion I had been on Ceres and was trying to alibi that one. Obviously, again, he knew who I was.

"If he knew me, why should he try to kill me, and Urteil too? Both of us suffered from slashed inso-suits, you know. We were both investigators. What was it Peverale feared?

"Then he began to talk about Sirians and robots at the banquet table, and things began to drop into place. Mindes's story suddenly made sense, and I knew at once that the only ones who could have brought a robot to Mercury were either Sirians or Dr. Peverale. To me it seemed that Peverale was the answer, that he was talking about Sirians now as a kind of insurance. If the robot were found and the sabotage stopped, it would serve as a smoke screen to hide his own part and, furthermore, it would make good anti-Sirian propaganda.

"I needed proof. Otherwise, Senator Swenson would shout we were setting up a smoke screen to cover the Council's own incompetence and extravagance. I needed good proof. With Urteil right on the ground, I dared not talk about the matter to anyone, Bigman, not even to you."

Bigman groaned in disgust. "When are you going to trust me, Lucky?"

"When I can count on you to avoid tricks like rough-and-tumbles with men twice your size," said Lucky with a smile that robbed the statement of some of its sting. "Anyway, I set out to capture the robot on the Sun-side and use him as evidence. That failed and I was forced to work a confession out of Peverale."

Lucky shook his head.

Bigman said, "What about Swenson now?"

"It's a draw, I think," said Lucky. "He can't do much with Urteil's death, since we can use Dr. Cook as a witness to show some of Urteil's dirty tactics. We can't do much against him, either, since the two top men at the Mercurian Observatory have had to be relieved of duty for felonies. It's a standoff."

"Sands of Mars!" moaned Bigman, "We'll have that cobber on our necks later on then."

But Lucky shook his head. "No, Senator Swenson is not a real cause for worry. He's ruthless and dangerous, but for that very reason he keeps the Council on its toes, keeps us from getting flabby.

"Besides," he added thoughtfully, "the Council of Science needs its critics, just as Congress and the government do. If ever the Council began to consider itself above criticism, then the time might come when it would establish a dictatorship over the Earth, and certainly I wouldn't want that to happen."

"Well, maybe," said Bigman, unsatisfied, "but I don't like that Swenson."

Lucky laughed and reached out to tousle the Martian's hair. "Nor I, but why worry about that now. Out there are the stars, and who knows where we'll be going next week, or why?"