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almost a mile out to sea at the moment。〃
Shocked； Rachel instantly became wary。 As she adjusted her mental picture of her surroundings； the thought of standing over the Arctic Ocean brought with it a sense of fear。
Tolland seemed to sense her uneasiness。 He stamped his foot reassuringly on the ice。 〃Don't worry。 This ice is three hundred feet thick； with two hundred of those feet floating below the water like an ice cube in a glass。 Makes the shelf very stable。 You could build a skyscraper on this thing。〃
Rachel gave a wan nod； not entirely convinced。 The misgivings aside； she now understood Tolland's theory about the origins of the plankton。 He thinks there's a crack that goes all the way down to the ocean； allowing plankton to e up through it into the hole。 It was feasible； Rachel decided； and yet it involved a paradox that bothered her。 Norah Mangor had been very clear about the integrity of the glacier； having drilled dozens of test cores to confirm its solidity。
Rachel looked at Tolland。 〃I thought the glacier's perfection was the cornerstone of all the strata…dating records。 Didn't Dr。 Mangor say the glacier had no cracks or fissures？〃
Corky frowned。 〃Looks like the ice queen muffed it。〃
Don't say that too loudly； Rachel thought； or you'll get an ice pick in the back。
Tolland stroked his chin as he watched the phosphorescing creatures。 〃There's literally no other explanation。 There must be a crack。 The weight of the ice shelf on top of the ocean must be pushing plankton…rich sea…water up into the hole。〃
One hell of a crack； Rachel thought。 If the ice here was three hundred feet thick and the hole was two hundred feet deep； then this hypothetical crack had to pass through a hundred feet of solid ice。 Norah Mangor's test cores showed no cracks。
〃Do me a favor；〃 Tolland said to Corky。 〃Go find Norah。 Let's hope to God she knows something about this glacier that she's not telling us。 And find Ming； too； maybe he can tell us what these little glow…beasties are。〃
Corky headed off。
〃Better hurry；〃 Tolland called after him； glancing back into the hole。 〃I could swear this bioluminescence is fading。〃
Rachel looked at the hole。 Sure enough； the green was not so brilliant now。
Tolland removed his parka and lay down on the ice next to the hole。
Rachel watched； confused。 〃Mike？〃
〃I want to find out if there's any saltwater flowing in。〃
〃By lying on the ice without a coat？〃
〃Yup。〃 Tolland crawled on his belly to the edge of the hole。 Holding one sleeve of the coat over the edge； he let the other sleeve dangle down the shaft until the cuff skimmed the water。 〃This is a highly accurate salinity test used by world…class oceanographers。 It's called 'licking a wet jacket。'〃
Out on the ice shelf； Delta…One struggled with the controls； trying to keep the damaged microbot in flight over the group now assembled around the excavation pit。 From the sounds of the conversation beneath； he knew things were unraveling fast。
〃Call the controller；〃 he said。 〃We've got a serious problem。〃
40
Gabrielle Ashe had taken the White House public tour many times in her youth； secretly dreaming of someday working inside the presidential mansion and being part of the elite team that charted the country's future。 At the moment； however； she would have preferred to be anywhere else in the world。
As the Secret Serviceman from the East Gate led Gabrielle into an ornate foyer； she wondered what in the world her anonymous informant was trying to prove。 Inviting Gabrielle into the White House was insane。 What if I'm seen？ Gabrielle had bee quite visible lately in the media as Senator Sexton's right…hand aide。 Certainly someone would recognize her。
〃Ms。 Ashe？〃
Gabrielle looked up。 A kind…faced sentry in the foyer gave her a weling smile。 〃Look over there； please。〃 He pointed。
Gabrielle looked where he was pointing and was blinded by a flashbulb。
〃Thank you； ma'am。〃 The sentry led her to a desk and handed her a pen。 〃Please sign the entry log。〃 He pushed a heavy leather binder in front of her。
Gabrielle looked at the log。 The page before her was blank。 She recalled hearing once that all White House visitors sign on their own blank page to preserve the privacy of their visit。 She signed her name。
So much for a secret meeting。
Gabrielle walked through a metal detector； and was then given a cursory pat down。
The sentry smiled。 〃Enjoy your visit； Ms。 Ashe。〃
Gabrielle followed the Secret Serviceman fifty feet down a tiled hallway to a second security desk。 Here； another sentry was assembling a guest pass that was just rolling out of a lamination machine。 He punched a hole in it； affixed a neck cord； and slipped it over Gabrielle's head。 The plastic was still warm。 The photo on the ID was the snapshot they had taken fifteen seconds earlier down the hall。
Gabrielle was impressed。 Who says government is inefficient？
They continued； the Secret Serviceman leading her deeper into the White House plex。 Gabrielle was feeling more uneasy with every step。 Whoever had extended the mysterious invitation certainly was not concerned about keeping the meeting private。 Gabrielle had been issued an official pass； signed the guest log； and was now being marched in plain view through the first floor of the White House where public tours were gathered。
〃And this is the China Room；〃 a tour guide was saying to a group of tourists； 〃home of Nancy Reagan's 952 per setting red…rimmed china that sparked a debate over conspicuous consumption back in 1981。〃
The Secret Serviceman led Gabrielle past the tour toward a huge marble staircase； where another tour was ascending。 〃You are about to enter the thirty…two…hundred…square…foot East Room；〃 the guide was narrating； 〃where Abigail Adams once hung John Adams's laundry。 Then we will pass to the Red Room； where Dolley Madison liquored up visiting heads of state before James Madison negotiated with them。〃
The tourists laughed。
Gabrielle followed past the stairway through a series of ropes and barricades into a more private section of the building。 Here they entered a room Gabrielle had only seen in books and on television。 Her breath grew short。
My God； this is the Map Room！
No tour ever came in here。 The room's paneled walls could swing outward to reveal layer upon layer of world maps。 This was the place where Roosevelt had charted the course of World War II。 Unsettlingly； it was also the room from which Clinton had admitted his affair with Monica Lewinsky。 Gabrielle pushed that particular thought from her mind。 Most important； the Map Room was a passageway into the West Wing…the area inside the White House where the true powerbrokers worked。 This was the last place Gabrielle Ashe had expected to be going。 She had imagined her e…mail was ing from some enterprising young intern or secretary working in one of the plex's more mundane offices。 Apparently not。
I'm going into the West Wing。。。
The Secret Serviceman marched her to the very end of a carpeted hallway and stopped at an unmarked door。 He knocked。 Gabrielle's heart was pounding。
〃It's open；〃 someone called from inside。
The man opened the door and motioned for Gabrielle to enter。
Gabrielle stepped in。 The shades were down； and the room was dim。 She could see the faint outline of a person sitting at a desk in the darkness。
〃Ms。 Ashe？〃 The voice came from behind a cloud of cigarette smoke。 〃Wele。〃
As Gabrielle's eyes accustomed to the dark； she began to make out an unsettlingly familiar face； and her muscles went taut with surprise。 THIS is who has been sending me e…mail？
〃Thank you for ing；〃 Marjorie Tench said； her voice cold。
〃Ms。 。。。 Tench？〃 Gabrielle stammered； suddenly unable to breathe。
〃Call me Marjorie。〃 The hideous woman stood up； blowing smoke out of her nose like a dragon。 〃You and I are about to bee best friends。〃
41
Norah Mangor stood at the extraction shaft beside Tolland； Rachel； and Corky and stared into the pitch…black meteorite hole。 〃Mike；〃 she said； 〃you're cute； but you're insane。 There's no bioluminescence here。〃
Tolland now wished he'd thought to take some video； while Corky had gone to find Norah and Ming； the bioluminescence had begun fading rapidly。 Within a couple of minutes； all the twinkling had simply stopped。
Tolland threw another piece of ice into the water； but nothing happened。 No green splash。
〃Where did they go？〃 Corky asked。
Tolland had a fairly good idea。 Bioluminescence…one of nature's most ingenious defense mechanisms…was a natural response for plankton in distress。 A plankton sensing it was about to be consumed by larger organisms would begin flashing in hopes of attracting much larger predators that would scare off the original attackers。 In this case； the plankton； having entered the shaft through a crack； suddenly found themselves in a primarily freshwater environment and bioluminesced in panic as the freshwater slowly killed them。 〃I think they died。〃
〃They were murdered；〃 Norah scoffed。 〃The Easter Bunny swam in and ate them。〃
Corky glared at her。 〃I saw the luminescence too； Norah。〃
〃Was it before or after you took LSD？〃
〃Why would we lie about this？〃 Corky demanded。
〃Men lie。〃
〃Yeah； about sleeping with other women； but never about bioluminescent plankton。〃
Tolland sighed。 〃Norah； certainly you're aware that plankton do live in the oceans beneath the ice。〃
〃Mike；〃 she replied with a glare； 〃please don't tell me my business。 For the record； there are over two hundred species of diatoms that thrive under Arctic ice shelves。 Fourteen species of autotrophic nannoflagellates； twenty heterotrophic flagellates； forty heterotrophic dinoflagellates； and several metazoans； including polychaetes； amphipods； copepods； euphausids； and fish。 Any questions？〃
Tolland frowned。 〃Clearly you know more about Arctic fauna than I do； and you agree there's plenty of life underneath us。 So why are you so skeptical that we saw bioluminescent plankton？〃
〃Because； Mike； this shaft is sealed。 It's a closed； freshwater environment。 No ocean plankton could possibly get in here！〃
〃I tasted salt in the water；〃 Tolland insisted。 〃Very faint； but present。 Saltwater is getting in here somehow。〃
〃Right；〃 Norah said skeptically。 〃You tasted salt。 You licked the sleeve of an old sweaty parka； and now you've decided that the PODS density scans and fifteen separate core samples are inaccurate。〃
Tolland held out the wet sleeve of his parka as proof。
〃Mike； I'm not licking your damn jacket。〃 She looked into the hole。 〃Might I ask why droves of alleged plankton decided to swim into this alleged crack？〃
〃Heat？〃 Tolland ventured。 〃A lot of sea creatures are attracted by heat。 When we extracted the meteorite； we heated it。 The plankton may have been drawn instinctively toward the temporarily warmer environment in the shaft。〃
Corky nodded。 〃Sounds logical。〃
〃Logical？〃 Norah rolled her eyes。 〃You know； for a prize…winning physicist and a world…famous oceanographer； you're a couple of pretty dense specimens。 Has it occurred to you that even if there is a crack…which I can assure you there is not…it is physically impossible for any sea…water to be flowing into this shaft。〃 She stared at both of them with pathetic disdain。
〃But； Norah。。。 ；〃 Corky began。
〃Gentlemen！ We're standing above sea level here。〃 She stamped her foot on the ice。 〃Hello？ This ice sheet rises a hundred feet above the sea。 You might recall the big cliff at the end of this shelf？ We're higher than the ocean。 If there were a fissure into this shaft； the water would be flowing out of this shaft； not into it。 It's called gravity。〃
Tolland and Corky looked at each other。
〃Shit；〃 Corky said。 〃I didn't think of that。〃
Norah pointed into the water…filled shaft。 〃You may also have noticed that the water level isn't changing？〃
Tolland felt like an idiot。 Norah was absolutely right。 If there had been a crack； the water would be flowing out； not in。 Tolland stood in silence a long moment； wondering what to do next。
〃Okay。〃 Tolland sighed。 〃Apparently； the fissure theory makes no sense。 But we saw bioluminescence in the water。 The only conclusion is that this is not a closed environment after all。 I realize much of y