Strickland shook his head in disbelief. "So if this thing spreads, we could have dogs with gills? Humans running around with wings?"

"It's highly unlikely, but not impossible. We forget how closely linked we are genetically to other animals. Only about a thousand genes out of a hundred thousand differentiate us from chimps. Even organisms as distant from us as roundworms have DNA sequences similar to ours, like variant spellings of the same word. If something gets into the code of any animal and tampers with it, even a little bit, the phenotypic alter-ations can be extraordinary." She tried to straighten her gla.s.ses, but they still tilted to the left.

"How can it create..." His eyes glazed as he took in his reflection in the window.

"You have to understand how viruses function. They can't live out-side their hosts, so it's to a virus's advantage for its host animal to survive and reproduce, pa.s.sing the virus along. The Darwin virus alters the host plant or animal's offspring so it exists in a wide variety of organisms. Natural selection then acts as the executioner of the unfit, killing off those less viable mutations." She gestured to the crash door. "Like the rabbit's offspring. But if this virus is indeed playing with segments of functional DNA code, sooner or later, it's bound to come up with viable mutations-offspring that'll survive and reproduce in turn. The virus introduces wild cards to the genetic deck, and shuffles over and over- maybe thousands of times. On Sangre de Dios, it finally dealt itself a winning hand.

"It's like that famous example where you have a million monkeys on a million typewriters typing for eternity. Eventually, the argument goes, one of them would randomly type Hamlet. Evolution works in similar fashion. It's unthinking; all that's necessary is variation and sheer num-bers. But think how much more quickly one of the monkeys would arrive at Hamlet were they already using words, or complete sentences, instead of merely letters. That's what's occurring here. This virus shuf-fles entire blocks of genetic code, drastically boosting the odds that viable offspring will be produced.Those offspring that survive...they'd have ma.s.sive fitness potential. It's as if they've evolved instantaneously. What usually takes millions of years has been hit upon in a single gener-ation. That's what's occurred on Sangre de Dios. Bear in mind that varia-tion is not predirected in favorable ways, so when it's this ma.s.sive, random, and viable... " She threw her arms wide and let them clap to her sides. "Those animals...it's amazing."

"Amazing?" Strickland took a deep breath. "The ramifications if this thing spreads are horrific. Dangerous biological agents are an issue of international security. Do you know, Dr. Everett, that a plane carrying a hundred kilograms of anthrax spores and equipped with a run-of-themill crop sprayer could fly over Washington, D.C., and deliver a fatal dose to about three million people? That a taxi could pump enough out its tailpipe on a sunny afternoon in Manhattan to kill five or six million people?"

"Yes, sir, I do." Samantha smiled curtly and turned back to the stack of micrographs in her lap. "I wrote that study."

CHAPTER 51.

--------------------- onald's nasal voice clicked through Derek's shoulder. "Gentlemen," he said. "And women. I'm calling in from Fort Detrick, conferenced with Dr. Samantha Everett."

"You're in Maryland?" Rex asked. "You flew out?"

"Yes," Donald said. "And after I explain our preliminary findings about this virus, you'll understand why."

Donald introduced Samantha, and the squad circled tightly as she proceeded to explain what they'd gleaned about the virus so far. Diego and Rex interrupted occasionally to explain the scientific terms to the soldiers, and to update Donald and Samantha about what they'd discov-ered in the specimen freezer and the water samples. When Samantha finished describing her hypotheses about the virus, there was a long pause.

Cameron felt the blood leave her face. If she contracted the virus, it would go to work on the embryo inside her. She had stood in the freezer with the others, the infected bodies swinging and dripping all around her. She'd already had morning sickness once-she was hardly at the top of her game, and if things went south, there was nothing anyone could do for her. Tank was watching her, maybe with concern, but he averted his eyes quickly when she looked over.

"But if this is how the virus works," Diego was saying, "then why do all the larvae look identical? Why are they not all different like the last generation we saw captured in the specimen freezer?"

"The virus must go dormant after the first generation," Samantha answered.

"So the first generation is all different," Szabla said, "but the second wave of offspring resemble their parents."

Savage lit a cigarette and Diego didn't even bother to comment.

"Of course," Rex said. "From a fitness perspective, if one of the mutated organisms survives to reproduce, it would be advantageous for it to replicate its own phenotype in its offspring. Continued mutation would compromise stability."

"It's like the virus found a working model, so it's sticking with it," Szabla added.

There was a rush of air as Samantha sighed into her telephone in the slammer. "It's amazing," she said. "The virus has evolved such that it provides a one-time opportunity for ma.s.sive mutation. An unthinking yet solution-oriented process to create new animals capable of filling environmental niches."

Savage exhaled a long, thick ribbon of smoke. "Evolution in over-drive," he said.

Diego stood up, sweat glistening on his forehead. "This could be an age-old process-the virus locked in the earth's core, living in ther-mophilic microbes, springing up at intervals of hundreds of thousands of years to revolutionize life forms. It could explain instances of rapid origination, anomalies in the fossil records. The jump from cold- to warm-blooded vertebrates. The archaeopteryx. The Cambrian explo-sion. The Burgess shale. We may be on the precipice of such a period." His hands were shaking. He put them in his pockets.

Cameron held up her hand. "Stop," she said. "First things first. How does the virus spread? Could we get it from one of these creatures?"

"It seems to spread in similar fashion as a blood-borne pathogen," Samantha said.

"What's that mean?" Justin asked.

"If you f.u.c.k one," Savage growled, "wear a condom."

"Don't have open contact with the larvae's secretions," Samantha said.

"Well, don't viruses mutate all the time?" Justin asked, his voice lined with panic. "I mean, what if this thing goes airborne?"

"Let's not get dramatic," Samantha answered calmly. "It's not aerosolinfectious now, and generally, viruses tend to retain similar properties as they evolve. Besides, you guys don't have mission-oriented protective posture suits, and even if you did, you wouldn't be able to bend over and touch your toes if you put 'em on."

"What steps should we take to ensure we don't get infected?" Cameron asked.

"Well, we don't even know if it can infect humans, though, clearly, we don't want to resolve that issue the hard way. So, for one, I'd steer clear of that specimen freezer. Those bodies are packed with the virus, and from what you said, they're discharging secretions copiously. The large body you have at the camp is probably still shedding. Burn it-for your safety, and so it doesn't work its way through the food chain as it decom-poses. Do you have any antibacterial gel?"

"Yes," Justin said. "One bottle."

"If you come into contact with any secretions, rinse off and apply the gel. Handle the larva with care, but there's no need to be paranoid. Touching it won't spread the virus." Her sneeze echoed through the transmitters. " 'xcuse me. I do have some good news for you. As Rex pointed out, the confluence of conditions that allowed the Darwin virus to find its way into a single viable animal host is quite extraordinary. If it operates like viruses that are similarly transmitted, the rate of infection we would antic.i.p.ate in the type of contact between a virus-bearing microorganism and an insect embryo is only one in eight. Taking into account the wasp and mantid populations of the island, and the odds of infected dinos going to spore state, UV weakening an ootheca so it could be compromised by parasitic wasps, and the virus. .h.i.tting the unhatched nymphs at precisely the right timing-we're looking at an estimated one in one hundred twenty-one shot that another mantid ootheca was infected. The odds that the infected ootheca would produce offspring that pulled the right combination of organs and structures from the resultant DNA soup to be viable are even lower, probably infinitesimal. It looks like the a.s.sumption you've been operating on-that there's only one mantid line-age-stands an extremely good chance of being accurate."

"So the larvae are infected," Diego said despondently. "All of them."

There was a pause before Samantha answered. "Yes, I would imagine so."

"If this virus does indeed increase mutation and speed generational turnover," Donald said, "that would explain a number of the things you've described about the animals."

"Like what?" Cameron asked.

"Well, the switch from incomplete to complete metamorphosis, for one."

"A two-stage metamorphosis allows an organism to take advantage of variant food sources," Rex murmured. "It opens up the range of food available to it through its life cycle. The larvae seem primarily herbivorous-"

"While the adults seem to prefer people food," Szabla said. No one laughed.

"It would also explain the mantids' accelerated rate of development," Donald said. "Early reproduction is one of the keys to rapid increase. A ten percent decrease in age at first reproduction is roughly equivalent to a one hundred percent increase in fecundity. The rapid cycling of gener-ations entails, of course, extremely short intergenerational gaps. Think of the Aphis fabae."

"I often do," Szabla said.

"It's an aphid. Embryonic development for the next three generations actually begins in the mother's body before her own birth. If all her off-spring survived, a single female could produce five hundred twenty-four billion progeny in a year. Not to mention cecidomyian gall midges, who eat their mother alive from the inside, only to crawl from her sh.e.l.l and be devoured by their own offspring two days later." There was a silence as Donald paused. "If this virus indeed hastens the infected species' radia-tion, don't expect your larvae to hold in instar stages too long. After another molting or two, you're due for a metamorphosis."

Derek gazed at the larva in his lap, clearly upset. "But how does the virus know to do all this?" he asked.

"It doesn't know anything," Donald answered. "It has adapted to act certain ways because it's been shaped over thousands, maybe millions, of generations by random mutation and natural selection. Its actions merely give the appearance of motive."

"Do you think the adults will actively hunt us?" Justin asked.

"As Rex pointed out, aside from the occasional dog, no other sizable and appropriate food source on the island comes to mind," Donald said slowly. "Livestock would be too large, iguanas too small, and they'd be unable to crack a tortoise."

"I know we're all in a bit of a creature feature mindset," Rex said. "But let's bear in mind that the mantids are not malevolent. They're ani-mals that act on need and instinct-no more, no less."

Savage covered one nostril with a thumb and blew snot on the ground. He wiped his hand off on his cammies.

"None of the other wildlife seems to be affected," Diego said. "Why would the virus merely affect one species of animal like this?"

"Viruses tend to be most prevalent in one species," Samantha said. "The 'virus reservoir.' Like deer mice to hantavirus, monkeys to simian hemorrhagic fever, Calomys callosus to Machupo. But the Darwin virus has been present in a fairly wide range-microbes, dinos, mantids, and rabbits. The fact that it affects animals in the embryonic stage is trouble-some, because that's the time when cells from different species most resemble one another. If it could infect a rabbit embryo, it's not unrea-sonable that it could infect a canine embryo, for instance. The long shot is that any of these infected embryos would actually be viable. As it stands, we only have one accountable virus reservoir-the mantid line-age."

"And what do you usually do with this 'virus reservoir?'" Diego asked. He closed his eyes, clearly not wanting to hear the answer.

"If we can, we exterminate it." Samantha's voice was soft through the transmitter.

Rex stood up, removed his dirty Panama hat, and poured water from a canteen over his head. It dripped down the jagged wisps of his bangs, running across his stubbled face. "We had hoped to observe them for longer," he said. "It's quite an . . . quite an amazing thing happening out here." The wind sucked through the watchtower in the distance.

"Let's not be hasty," Donald said. "There still might be some way around killing them all. I'd like to confer with Samantha and the other virologists here and check back in a few hours. In the meantime, we're still doing our best to get you pulled off that island."

Donald and Samantha clicked out. The group sat around the dead fire, staring at one another across the ashes. Rex raised his hands, then let them fall into his lap.

"I don't want to exterminate this species," Diego said.

"It's not a new species," Rex said. He stood, running his fingers through his wet hair. "They're just manifestations of the virus." The oth-ers looked puzzled. "You've heard the expression that a chicken is merely the egg's way of making another egg?" No one looked like they had, so Rex continued. "Well, the mantid is just the virus's way of mak-ing more virus. These are sick animals. Infected and altered."

"This is how evolution works," Diego snapped. "Through sickness. Through mutation. It's a natural virus. These are all natural processes."

Savage leaned close to Diego, almost singeing him with the end of his cigarette. "I don't give a s.h.i.t about natural," he growled. "Murder is nat-ural. Eating one's young is natural. Don't pull that s.h.i.t on me again. You're so worried about killing the right animals in the right places. Pigs are bad, but lizards are good. This tree belongs here, this bush should be pulled up. It's all bulls.h.i.t. Who cares whether these things are natural or not? We're a.s.sessing risk here. Us or them."

A flight of birds erupted from the Scalesia canopy, flycatchers and petrels, rising in crazed, looping circles. "But we could be...we could be terminating a species here," Diego said. "Many species."

"This island isn't ready for them," Rex said. Diego was shaking his head, so he stepped forward, addressing him softly. "You actively elimi-nate other feral animals-puppies, kittens, goats. These mantids are the ultimate introduced species-they could devour all the other animals, become just as damaging as pigs. Worse. We have no idea how they'll impact the ecology here. We might want to think about-"

Derek rose abruptly. "n.o.body's making a move without my approval," he said. When he unclenched his hands, Cameron noticed the marks his fingernails had pressed into his palms. "Nothing is to happen unless I give the order. Is that clear?"

Suddenly, the ground bucked underfoot and Derek went down. A thin crevice opened up, snaking its way through the field parallel to the road. A few of the Scalesias at the forest's edge snapped, their branch-heavy tops smashing into the ground. Szabla and Justin's tent flapped up in the air, pinned down only by two strainers staked deep in the gra.s.s.

Szabla fell, landing on her back so hard her breath left her in a grunt. A hurricane lamp was smashed by a rolling cruise box. One of the logs by the fireplace dislodged from its muddy base and spun toward Szabla. She was sucking air, trying to pull herself up, but Cameron reached her first, grabbing one boot and yanking her clear just in time.

A large balsa by the road snapped at its base, plummeting down with a fierce whistling. It smashed into a lava boulder, splitting it with cracks. It lay on its side, palmate leaves riffling in the wind, gray bark standing out against the green of the pasture.

Rex watched the waving trees in the forest through the L of his thumb and index finger. A ma.s.sive shudder shook the ground as a shelf of rock and silt sheered off the steep eastern coast nearly a kilometer away, then there was silence. Dust and dirt swirled in the air, refusing to settle. Derek pulled himself up and trotted to his tent, Diego scurrying after him. The others rose, dusting themselves off.

Derek stumbled from his tent, holding the larva along the length of his arms. "Set it down!" Rex barked. "Don't handle it."

Derek placed the larva hastily on the gra.s.s, and Diego examined its soft underside. "It appears to be unharmed," Diego finally said.

An aftershock caused them to brace themselves, but it quickly pa.s.sed. Savage reached over, wiping a smudge of mud roughly from Szabla's cheek.

"Well, that's a f.u.c.king relief," he said.

CHAPTER 52.

--------------------- erek sat silently on a log, holding the larva in his lap and gazing at its gla.s.sy eyes as the others rea.s.sembled the camp, doing their best to ignore him. The scorching sun had finally begun to work its way to the water.

Justin helped Szabla get the tent straightened out and they ran a sup-plies check. Tank and Savage strained to get the log back in line with the others around the fire, and Cameron helped Rex and Diego test their equipment.

The mantid body sprawled in the gra.s.s, attracting insects and birds. After Rex and Diego examined it, taking copious notes, Tank and Savage dragged the body a few hundred yards east of the camp and built a small pyre around it, using firewood and leaves. It took a few tries to get the body ignited, but once it got going, it burned quickly, crackling like a fly in a bug zapper. The fire rose like a teepee, a cone of light fighting off the dusk. They came back, rinsed with water from the canteen, and rubbed gel into their hands.

Derek's transmitter vibrated four times before he took note. Lethargi-cally, he tilted his head to his shoulder. "Mitch.e.l.l. Public." The others gathered around quickly.

"Mitch.e.l.l, it's Mako here." If Mako was waiting for a response, he didn't get one. "I just got a call from a colonel at Fort Detrick. Strickland. Do you know the name?"

Derek shook his head.

"No," Cameron said into her transmitter. "We don't."

"They're getting heavy into the science over there. Some kind of virus you guys are exposed to. Said it had to do with the mutated animal you were describing. That Denton fellow from the New Center's been lean-ing on Strickland and our old friend the Secretary of the Navy to get you guys extracted. Said you're in grave danger."

"Dej f.u.c.kin' vu," Savage growled.

"Problem is, that little rumble you kids just felt originated off the coast of Colombia. A significant number of our air a.s.sets were on the ground in Bogot. We sustained heavy damages; they're still sorting through the wreckage. I've been on the phone this last hour trying to find anything to pull you guys off that rock, but looks like we're snake eyes for the time being. The good news is, I managed to block out a Blackhawk and a C-130 for 2200 on the thirty-first. We'll have you out in fifty-two hours."

"We might be insect s.h.i.t in fifty-two hours," Justin grumbled.

Derek and Mako stood off in silence, each waiting for the other to speak next.

"I'm sorry, soldier," Mako finally said. "It's the best we can do." He clicked out.

The others sat quietly for a few moments. Szabla rose and went to her tent.

Cameron walked over to Derek, stopping with one boot on the log beside him. "I'm gonna go check on the Estradas again, make sure they're all right," she said.

"Are you asking or telling me?" Derek said, his eyes not leaving the larva.

"Derek," Cameron said. "She's six months pregnant. I'm gonna go check on them."

Derek studied her for a few moments. "I'm not going with you. Grab a buddy."

Cameron signaled Justin with a flick of her head, and he followed her across the field to the road. They walked side by side, the watchtower looming ahead. In a few places, the ground had buckled up in scarps, four- to five-inch lips in the road.

"Derek is not Derek," Justin said after a few moments. "We might need to think about doing something."

Cameron did not respond.

They reached the bloque house and Cameron called out, anxious to see the couple. There was no answer. The air around them took on another shade of gray as the sun dipped out of sight behind a row of plantain trees.