Sitting beside him at the infirmary desk, Yang Meilin scanned the short list as a woman lost on the desert would search the horizon for an oasis.
"The answer is here," she said, barely loud enough for Reed to hear her. "I am certain of it."
The anger that Tony had felt earlier was gone now. Yang was not going to upstage him. She was just as bewildered and frustrated as he was. He felt almost sorry for her. Sorry for both of them. The two great medical experts, he said to himself, as stymied as a pair of chimpanzees. Says worlds for the selection board, doesn’t it?
"I have a feeling," Yang said, pressing one hand flat against her middle, "that we have seen the answer, but we do not yet recognize it."
Reed let a thin sigh escape. "Feelings are one thing," he said almost gently. "What we need are facts."
"The one clear fact that we have," she said, "is that everyone here on the ground is ill, except you."
Tony felt a pang of guilt. "Yes. That’s what’s so damned puzzling about all this, isn’t it?"
"What are you doing that the others are not?"
He shook his head. "Not a damned thing, as far as I can tell. I breathe the same air, I eat with them…"
"Something in the food?"
Leaning back in his chair, Tony replied, "I can’t imagine that there is something in my meals that is protecting me from whatever the others have come down with. Or conversely, that their food is tainted in some way and mine just happens not to be."
"Vitamin deficiency is on the computer’s list."
"Yes, I know." Some of the old exasperation was creeping back into Tony. "But we’ve checked that out time and again. They all take their vitamin supplements, just as I take mine. It can’t be that."
"You take the same pills they take?"
"Yes, of course."
"Every day?"
"Yes."
Yang lapsed into silence and turned her eyes back to the screen, as if she thought that by staring at it hard enough the answer would come clear.
Something nagged at Reed’s consciousness. Something peripheral, subliminal. As if they had touched on the answer without knowing it. As if…
It can’t be the vitamins, he told himself. I take the same dietary supplements that the others do every day. I watch them all swallow them down with their breakfasts every morning. The four in the rover are out of my sight, of course, but I check with them every day.
Could it be radiation poisoning? Something so subtle that the dosage meters aren’t equipped to detect it? After all, everyone else has been outside the dome much more than I have. I’ve stayed in here while they’ve been out doing their work.
That couldn’t be it. There’s no strange radiation on Mars. Naguib and the others have been measuring the radiation environment since we landed. And the unmanned probes were measuring it for years before we arrived here.
Still the unconscious thought pecked at him. Something about the vitamins.
Reed closed his eyes and envisioned his morning routine. He came to the infirmary and took his own vitamin pills, then went to the galley and made certain that there were enough there for all the others and that they took theirs with their breakfasts. He no longer mixed his morning cocktail; he wanted his head absolutely clear of drugs during this emergency. He personally watched everyone swallow their pills each morning, except for the occasional early bird who finished breakfast before he got to the galley. Since this malady had struck, there had been no one up and stirring earlier than Tony, not even Vosnesensky.
His eyes suddenly shot to the cabinet where the vitamin bottles stood. Each bottle held five hundred of the ovoid orange pills.
And locked in his medicine chest was a smaller bottle, the one he took his own pills from.
"Oh no," he groaned.
Yang jerked from her self-absorbed study as if Reed had slapped her. "What? What did you say?"
"I don’t take my vitamin pills from the same jar as the others."
She looked hard at him. "Does that make a difference?"
"It shouldn’t… except—"
Yang Meilin watched him expectantly. Tony could feel the anticipation radiating from her tense body.
"That first jar there," he pointed to the glass-fronted cabinet, "was open when the meteor strike punctured the dome. The other jars have never been opened; they’re still in their original seals."
Tony felt his face flush deeply with guilt. When the meteoroid had punctured the dome and all the alarms had gone off, that one big jar had been sitting open on his desk. He had knocked the bottle over in his rush to get out of the infirmary and into his hard suit. Afterward, when the emergency was over, he had picked up the pills scattered across his desktop and replaced them in the same bottle, discarding only those he had found on the floor.
Nothing wrong with them, he had told himself. Then he had transferred the pills to the smaller bottles that fit into the galley shelves.
His own supply of vitamin supplement was already in a smaller bottle, safely sealed in his medicine cabinet along with his amphetamines and other drugs. That medicine cabinet was not only locked; it was airtight.
"Their pills were exposed to pure oxygen," he muttered.
Yang put a hand to her lips.
"Yes," Reed said, putting the scenario together as he spoke, "the dome was pressurized with pure oxygen for almost thirty-six hours. It took a couple of days before we pulled enough nitrogen from the air outside to make an Earth-normal mixture in here again."
"Pure oxygen…"
"Pure oxygen will destroy ascorbic acid," Reed said absently, as if recalling some obscure test question from a college examination.
"The pills they are taking have no vitamin C in them."
"Right. They’ve all come down with scurvy."
"Scurvy!" Yang immediately grabbed the computer keyboard and typed furiously for a few moments. The machine hummed to itself, while Tony writhed inwardly in mental agony. My fault. Every bit of it is my own stupid fault.
"It correlates," Yang said, eyeing the new data displayed on the computer screen. "They all show the symptoms of scurvy."
Reed sat back in his chair feeling as weak and hollow as if he had come down with the affliction himself. Scurvy. And it’s all my fault. If only I had seen it earlier. Of course it had to be that. The oxygen, the pills…
He looked up and saw that Yang was striding through the infirmary doorway.
"Where are you going?" Tony called to her as he scrambled from behind his desk.
"Wardroom," she answered over her shoulder. Little though she was she marched like a trained soldier, arms swinging, boots clacking on the plastic floor. Tony hurried to catch up with her.
"Looking for anyone in particular?" he asked.
"The ground team leader. Vosnesensky."
"Ah. Yes, of course."
"You have bottles of vitamins that have not been unsealed?" Yang asked. "Not contaminated by oxygen?"
"Yes," he answered. "Fifteen hundred of them, in three sealed bottles."
Monique Bonnet was at the wardroom table with Paul Abell and Mironov, all three of them slumped wearily.
"Where is the group leader?" Yang asked.
Monique gave an exhausted sigh, then replied, "I believe he is at the communications console."
Yang headed off for the comm console without another word, Reed trailing right behind her. She must be hell on wheels in a hospital, the Englishman thought. God help the man or woman who gets in her way!
Vosnesensky looked as if he were ready to drop off to sleep. He sagged in the chair; his face looked puffy, red eyed, bleary. Connors’s black features in the communications screen looked no better; worse, in fact.