"Go on."

"Well, as a rule, the manner of death has nothing to do with the personality of the deceased. Whether a person dies of pneumonia, cancer, or in a car accident is not something determined by his personality. Of course there are exceptions, as in the case of a test pilot"s occupational death, but as a rule there"s no correlation between the way a person dies and the way he lives."

"In short, death is unrelated to personality type. Go on."

"But here it is related."

"Ah, now you"re feeding me demonology! Just what are you implying?"

"Exactly what I said. A champion swimmer dies in a drowning accident. A mountain climber falls to his death. A car fiend gets killed in a head-on collision."

"Hold on! Which one was the car fiend-t.i.tz?"

"Yes, He owned three cars, two of them sports cars. To continue: a coward is killed while running away. . . ."

"Who was that?"

"Osborn. The one who abandoned his car and was taken for a member of the road gang."

"You didn"t mention anything about his being a coward."

"I"m sorry. The version I gave you left out many details. Osborn was in the insurance business, was heavily insured himself, and was known as a man who avoided taking any risks. The first time he felt threatened he sat down and wrote a letter to the police, then lost his nerve and took off. Adams, the eccentric, died as he lived-in an unconventional manner. The heroic reporter stuck it out till the end and then shot himself. . . ."

"Wasn"t he trying to escape, too?"

"I don"t think so. He had orders to fly to London. He suffered a momentary breakdown, tried to slash his wrists, then patched himself up and flew off on his new a.s.signment. When he saw he wasn"t up to it, he shot himself. He must have been a very proud man. I have no idea how Swift would have died. As a young man he was known for being wishy-washy, a typical prodigal son, a dreamer, always in need of someone stronger than himself. A wife, a friend. It was the same way in Naples."

Barth sat there with wrinkled brow, tapping his chin, and stared absently into s.p.a.ce.

"Well, that"s easy enough to explain. A case of regression, of reversion to an earlier time period . . . I"m not a specialist in this area, but I believe that some hallucinogens . . . What was the consensus of the toxicologists? Of the psychiatrists?"

"Certain symptomatic a.n.a.logies with LSD, except that LSD does not have such individualized effect. Pharmacology has no record of such a drug. The deeper I delved into their individual backgrounds, the more I saw that not one of them had acted contrary to his nature-quite the opposite, that each had revealed it in grotesquely exaggerated form. A man who"s careful with money becomes a penny pincher. A pedant-I"m referring now to the rare-book dealer-spends the whole day cutting up a trunkful of papers into little strips. Examples abound. If I could leave you the files, you"d see for yourself."

"By all means. So this factor X would have to be something on the order of a "personality drug." Right . . . But such an approach won"t bring us any closer to a solution. Psychological a.n.a.lysis can tell us how the factor behaves, but not how it infiltrates the victim."

He was leaning forward in his chair, his head lowered and his eyes fixed on his hands, which were cupped around his knees. Suddenly he looked me straight in the eye.

"I"d like to ask you a personal question. May I?"

I nodded.

"What was it like during the simulation? Were you confident the whole time?"

"No. It was altogether an awkward situation, not at all as I had imagined it would be. Not because I was using a dead man"s things-I got used to that In a very short time. Because of my profession, I was considered tailor-made for the mission."

"Is that so?" His eyebrows shot up. "The public imagines it to be fascinating, but except for a few brief moments of excitement it"s all routine -boring and monotonous routine."

"I see. In much the same way as in Naples, right?"

"Yes, especially since we"re also trained in the art of self-a.n.a.lysis. If instruments are always subject to error, then the final indicator has to be man."

"Monotonous routine, you say. In what ways were you excited in Naples? When and where?"

"When I was afraid."

"Afraid?"

"At least twice. And each time it gave me something of a thrill."

The words did not come easily, for I was dealing in intangibles. He never took his eyes off me. "Did you enjoy being afraid?"

"I can"t give you a yes or no answer. It"s best when a person"s abilities coincide with his ambitions. My ambitions have always tended toward the impossible. There"s an infinite variety of risks, but I personally have never been attracted by such ordinary risks as, say, Russian roulette. That sort of test strikes me as jejune. On the other hand, I"ve always had a great attraction for the unknown, the unpredictable, the undefinable."

"Is that why you decided to become an astronaut?"

"I don"t know. Maybe that"s the reason. People think of us as clever chimpanzees guided by a remote-control computer. The highest order, the symbol of our civilization, whose opposite pole you see before you." I pointed to the paper featuring a front-page photo of the escalator. "I don"t believe that"s necessarily true. And even if it were true, we"d have been all alone on Mars, completely on our own. I knew all along my physical disability would hang over me like the blooming season, I"m totally worthless. Still, I was counting on the fact that since no vegetation grew on Mars, which everybody, including my superiors, took for granted . . . but anyhow it was the hay fever that got me demoted to the backup crew, where I knew I didn"t stand a chance."

"Of flying to Mars?"

"That"s right."

"And did you go on being a backup member?"

"No."

"Aut Caesar aut nihil."

"That"s one way of putting it."

He unclasped his hands and sank deeper into his armchair. Sitting there with eyelids half open, he seemed to be digesting my words. Then a twitch of the eyebrows and a flicker of a smile.

"Let"s return to earth. Did all the victims have allergies?"

"Just about, though in one case it was never substantiated. The allergies varied, dust allergy being the most common, followed by asthma. . . ."

"And when was it you were afraid? A moment ago you mentioned . . ."

"I remember two different occasions. The first time was in the hotel restaurant, when another Adams was paged to the phone. I knew it was a popular name, I knew they were paging someone else; still, for a moment I had the feeling it wasn"t just a coincidence."

"You had the feeling they were paging a dead man, is that it?"

"Not at all, I thought it was the start of something. That it was a code word being used so none of the other customers would be the wiser."

"Did it ever occur to you it might have been someone from your own team?"

"Out of the question. Under no circ.u.mstances were they to get in touch with me. Only in the event of a catastrophe, say, a declaration of war, was Randy, our leader, supposed to approach me directly. But only under such conditions."

"Excuse me for being so inquisitive, but this strikes me as important. So Adams was paged. But what if the caller really had you in mind; wouldn"t that mean he saw through your disguise and was telling you as much?"

"That"s exactly why I was so scared. I was even tempted to go to the phone."

"What for?"

"To make contact with the other side. Better that than nothing at all."

"I see. But you didn"t go, did you?"

"No. The real Adams beat me to it."

"And the second time?"

"That was during my one night in Rome, at the hotel. I was staying in the room where Adams had died . in his sleep. Oh yes, there"s something else I should explain. You see, various simulation roles were considered. I didn"t have to pose as Adams, there were alternate roles, but I sat in on the meetings and tipped the scale in favor of Adams-"

I broke off, seeing Earth"s eyes momentarily light up.

"Let me guess. It wasn"t the temporary insanity, it wasn"t the seaside, and it wasn"t the highway. It was just the thought of that safe and secluded hotel room -the solitude, the comfort, and death. Am I right?"

"Possibly, though I wasn"t aware of it at the time. I guess they thought I was hoping to find the secret disclosures he was supposed to have stashed away somewhere, but that wasn"t it at all. The truth was, I found the man somehow likable."

Even though he"d stung me a moment ago with his "Aut Caesar aut nihil" I found myself being a lot more talkative than usual, so dependent was I on this man"s help. Exactly when this whole affair had become an obsession with me I couldn"t say. At first I"d treated the impersonation as just another routine exercise, as a necessary part of the game. I don"t know at what point it had pulled me in so completely that at the same time it pushed me away. I was looking forward to the danger, counting on it; I knew it wasn"t my imagination; but just when I seemed to be on the verge of it, it turned out to be an illusion. I was barred from it. I"d done everything Adams had done-everything except share the same fate, and that"s why I had nothing to show for it. Maybe Barth"s remark had offended me so much because it touched on the truth. One of Fitzpatrick"s medical colleagues on the Mars project, Ken, a Freudian, would have said I was trying to force a showdown, that I preferred death to defeat; in other words, he"d have explained my choice of Adams, the mission itself, in terms of a Freudian death wish. You can bet that"s what he would have said. But who cares. Asking for this Frenchman"s help was tantamount to violating the mountain climber"s code: I was giving him the lead so he could pull me up on the rope. But better that than total disaster: I had no intention of winding up a loser.

"Let"s talk about methodology." Barth"s voice roused me from my thoughts. "First of all, the cla.s.s of victims, the mode of differentiation. In this regard you proceeded far too arbitrarily."

"What makes you think so?"

"The fact that the incidents didn"t form categories of their own but were arbitrarily categorized as relevant or irrelevant. Your criteria were death and insanity, or at least insanity, even when the latter failed to result in death. Compare the behavior of Swift and Adams. Swift, you might say, went publicly insane, whereas if it hadn"t been for Adams"s letter to his wife, you never would have found out about his hallucinations. And there"s no telling how many other cases there were like that."

"Excuse me," I said, "but that"s inevitable. What you"ve just accused us of is the cla.s.sic dilemma of every investigation into the unknown. Before its limits can be defined the agent of causality must be identified, but before the agent of causality can be identified one must first of all define the subject under investigation."

He looked at me with undisguised approval.

"Well, well, I see you"re well versed in the language, too. But it surely wasn"t the detectives who taught it to you, now was it?"

I said nothing in reply. He sat rubbing his chin.

"Yes, that is indeed the cla.s.sic dilemma of induction. But let"s turn to some of the discarded facts, to the false clues. Were there any promising leads that in the end proved useless?"

Now it was my turn to look at him with approval.

"Yes, one very interesting one. We really had our hopes pinned on it. Before leaving for Italy all of the American victims had been patients at one of Dr. Stella"s clinics. You"ve heard of Dr. Stella, I suppose?"

"No, I haven"t."

"People say different things about him-some consider him to be one of the best, others claim he"s a quack. Whenever one of his patients was suffering from rheumatism, he would prescribe the mineral baths in Naples."

"What!"

"I jumped, too, when I heard that, but it turned out to be a false lead. He considered the baths around Vesuvius to be far and away the best, even though we have more than our share in the States. The ones who were talked into making the trip were in the minority, for it isn"t true that all Americans are spendthrifts. If a patient said he couldn"t afford a trip to Vesuvius, Stella would send him to an American health spa. We tracked down these people-they numbered about a hundred- and found them all safe and sound. Some of the patients were just as handicapped as before, but in any case we didn"t come across a single fatality of the Italian type. Most of them died of natural causes- heart disease, cancer. . . ."

"I a.s.sume they were married, had families of their own," said Barth, distracted by some thought or other.

I couldn"t help smiling.

"Doctor, now you"re resorting to the same kind of crazy parlance, the same c1iches, as those people in the agency. ... As a matter of fact, most of them did have families, but then there was no shortage of widowers and old bachelors among them, either. Besides, since when are wives and children an antidote? And an antidote against what?"

"You can"t reach the truth without crossing a sea of mistakes," Barth said sententiously but with a wry look in his eye. "And do you happen to know how many patients this Dr. Stella sent to Naples?"

"Yes, I do know. And this is one of the most bizarre coincidences of all. Every time I think about it I feel like I"m on the verge of cracking the case. Altogether he sent twenty-nine rheumatic patients, including five of our Americans: Osborn, Brunner, Coburn, Heyne, and Swift."

"Five of the seven Americans?"

"That"s right. Neither Emmings nor Adams had gone to Stella"s clinic for treatment. Nor had Brigg, but then, as you know, he was never cla.s.sified as a victim."

"This is all extremely relevant. And the other twenty-four patients?"

"I know the statistics by heart. Sixteen of them had been sent before any of the incidents in question had taken place. All returned safely to the States. Last year he sent thirteen. Five of the victims came from this group."

"Five of the thirteen? And of the eight who survived, were there any conforming to the "model victim"?"

"Three of them, in fact. All single men, financially well off, and in their fifties. All safely returned. All alive."

"Only men? Didn"t Stella ever treat women?"

"He did treat women. Prior to the deaths in question he sent four women to Italy, two just last year. None this year."

"How do you explain this disproportion between the s.e.xes?"

"Stella"s clinics first became famous as teatment centers for men. Potency disorders, falling hair . . . Later this was played down, but Stella still has the image of being a man"s doctor. So there"s a very logical explanation for the disproportion."

"Still, the fact remains . . . not a single woman was included among the victims, even though Europe has its share of elderly ladies, too. Does Stella operate any clinics in Europe?"

"No. The European victims never came into contact with Stella. That"s pretty safe to a.s.sume, since none of them had visited the States within the previous five years."

"Did you ever consider the possibility that there might be two separate operations-one for the Americans, another for the Europeans?"

"We did consider that. We compared both groups within the same set, but nothing came of it."

"Why did he insist on sending his patients to Naples and not somewhere else?"

"Very simple. He"s a second-generation Italian, his family comes from somewhere around Naples, and he probably stood to make a profit through his connections with some of the local balneologists, such as Dr. Giono. Medical confidentiality prevented our gaining access to the correspondence, but it"s only logical that a doctor on the other side of the ocean would recommend patients to his Italian colleagues. At any rate, we didn"t uncover anything suspicious in their relationship. I suppose that for every patient he recommended he received a certain percentage."

"How do you explain that mysterious blank letter delivered after Mittelhorn"s death?"

"I suspect it was sent by a member of Mittelhorn"s own family, someone who was familiar with the circ.u.mstances of his death and who was as eager as Mrs. Barbour to see the investigation continued but who, for one reason or another, couldn"t or didn"t want to intervene as openly as she did. Someone who had good reason to believe a crime had been committed and was trying to stir up suspicion so the police would keep the case open. The letter was postmarked Switzerland, where Mittelhorn had a number of relatives. . . ."

"Were there any drug addicts among Dr. Stella"s patients?"