"Where did she say she went?"

"Nobody asked her at the time. She was asked afterward and she said she had gone to her cabin to go to the bathroom. Maybe she did. But her cabin was reasonably near mine."

"No one saw her at all?"

"No one would. Everyone was in the dining room and to the Indonesians all Americans look alike."

Avalon said, "What's the fuss over the hot chocolate you referred to?"

Long said, "That's where one of the married couples

comes in. Call them the Smiths and the other one the Joneses, or the other way around. It doesn't matter. Mr. Smith was the raucous type. He reminded me, in fact, of-"

"Oh, Lord," said Rubin. "Don't say it."

"All right, I won't. He was one of the lecturers. In fact, both Smith and Jones were. Smith talked fast, laughed easily, turned everything into a double-entendre, and seemed to enjoy it all so much he had the rest of us doing it, too. He was a very odd person. The kind of fellow you can't help but take an instant dislike to and judge to be stupid. But then, as you get used to him, you find you like him after all and that under the surface nonsense, he's extremely intelligent. The first evening, I remember, the Doctor kept staring at him as if he were a mental specimen, but by the end of the cruise, he was clearly pleased with Smith.

"Jones was much quieter. He seemed horrified, at first, by Smith's outrageous comments but eventually he was matching him, I noticed-rather, I think, to Smith's discomfiture."

Avalon said, "What were their fields?"

"Smith was a sociologist and Jones a biologist. The idea was that space exploration was to be viewed in the light of many disciplines. It was a good concept but showed serious flaws in the execution. Some of the talks, though, were excellent. There was one on Mariner 9 and the new data on Mars that was superb, but that's beside the point.

"It was Mrs. Smith who created the confusion. She was a moderately tall, thin girl. Not very good-looking by the usual standards but with an extraordinarily attractive personality. She was soft-spoken and clearly went through life automatically thinking of others. I believe everyone quickly grew to feel quite affectionate to her and Smith himself seemed devoted. The evening I shot my mouth off, she ordered hot chocolate. It came in a tall glass, very top-heavy, and, of course, as a mistaken touch of elegance, it was brought on a tray.

"Smith, as usual, was talking animatedly and waving

his arms as he did so. He used all his muscles when he talked. The ship swayed, he swayed-well, anyway, the hot chocolate went into Mrs. Smith's lap.

"She jumped up. So did everyone else. Miss Robinson moved quickly toward her to help. I noticed that and that's how I know she was back by then. Mrs. Smith waved help away and left in a hurry. Smith, looking suddenly confused and upset, tore off the paper Dutch hat he was wearing and followed. Five minutes later he was back, talking earnestly to the head steward. Then he came to the table and said that Mrs. Smith had sent him down to assure the steward that she was wearing nothing that couldn't be washed, that she hadn't been hurt, that it wasn't anyone's fault, that no one was to be blamed.

"He wanted to assure us she was all right, too. He asked if we could stay at the table till his wife came back. She was changing clothes and wanted to join us again so that none of us would feel as though anything very terrible had happened. We agreed, of course. None of us were going anywhere."

Avalon said, "And that means she had time to get to your cabin."

Long nodded. "Yes, I suppose so. She didn't seem the type but I suppose in this game you disregard surface appearances."

"And you all waited?"

"Not the Doctor. He got up and said he would get some ointment from his office in case she needed it for burns, but he came back before she did by a minute or so."

Avalon said, tapping his finger on the table slowly to lend emphasis, "And he might have been at the cabin, too, then. And Miss Robinson might, when she left before the hot-chocolate incident."

Rubin said, "Where do the Joneses come in?"

Long said, "Let me go on. When Mrs. Smith came back she denied having bean burned and the Doctor had no need to give her the ointment, so we can't say if he even went to get it. He might have been bluffing."

"What if she had asked for it?" said Halsted.

"Then he might have said he couldn't find what he had been looking for but if she came with him he'd do what he could. Who knows? In any case, we all sat for a while almost as though nothing had happened and then, finally, it broke up. By that time, we were the last occupied table. Everyone left, with Mrs. Jones and myself lingering behind for a while."

"Mrs. Jones?" asked Drake.

"I haven't told you about Mrs. Jones. Dark hair and eyes, very vivacious. Had a penchant for sharp cheeses, always taking a bit of each off the tray when it was brought round. She had a way of looking at you when you talk that had you convinced you were the only object she saw. I think Jones was rather a jealous type in his quiet way. At least, I never saw him more than two feet from her, except this one time. He got up and said he was going to the cabin and she said she would be there soon. Then she turned to me and said, 'Can you explain why those terraced icefields on Mars are significant? I've been meaning to ask you all during dinner and didn't get a chance.'

"It had been that day that we had had the magnificent talk on Mars and I was rather flattered that she turned to me instead of to the astronomer who had given the talk. It seemed as though she were taking it for granted I knew as much as he did. So I talked to her for a while and she kept saying, 'How interesting.' "

Avalon said, "And meanwhile, Jones could have been in your cabin."

"Could be. I thought of that afterward. It was certainly atypical behavior on both their parts."

Avalon said, "Let's summarize, then. There are four possibilities. Miss Robinson might have done it when she left before the hot-chocolate incident. The Smiths might have done it as a team, Mr. Smith 'deliberately spilling the hot chocolate, so that Mrs. Smith could do the dirty work. Or the Doctor could have done it while going for the ointment. Or the Joneses could have done it as a team, with Jones doing the dirty work while Mrs. Jones kept Dr. Long out of action."

Long nodded. "All this was considered and by the time the ship was back in New York, security agents had begun the process of checking the background of all six. You see, in cases like this, suspicion is all you need. The only way any secret agent can remain undetected is for him or her to remain unsuspected. Once the eye of coun-terintelligence is upon him, he must inevitably be unmasked. No cover can survive an investigation in depth." Drake said, "Then which one did it prove to be?" Long sighed. "That's where the trouble arose. None of them. All were clean. There was no way, I understand, of showing any of them to be anything other than what they seemed."

Rubin said, "Why do you say you 'understand.' Aren't you part of the investigation?"

"At the wrong end. The cleaner those six are, the dirtier I appear to be. I told the investigators-I had to tell them-that those six are the only ones who could possibly have done it, and if none of them did, they must suspect me of making up a story to hide something worse."

Trumbull said, "Oh, hell, Waldemar. They can't think that. What would you have to gain by reporting the incident if you were responsible?"

"That's what they don't know," said Long. "But the information did leak and if they can't pin it on any of the six, then they're going to pin it on me. And the more my motives puzzle them, the more they think those motives must be very disturbing indeed. So I'm in trouble."