EPTEMBER 5, 5:25 P.M.

WASHINGTON, D.C.

Out in the steaming swelter again, Gray strode down the sidewalk in front of the Smithsonian Castle. The national Mall spread to the left, mostly deserted due to the heat.

Behind Gray, crime tape still marked off the site of the afternoon’s murder. The forensics unit had finished its sweep, but the area was still locked down, under the eye of a posted D.C. policeman.

Gray walked east along Jefferson Drive. He was shadowed by a large bodyguard, whom he was doing his best to ignore. He had not asked for any protection, especially this man. He touched the mike at his throat and subvocalized into it. “I’ve found a trail.”

The fizzle of a reply rasped out of his wireless earpiece. Cocking his head, Gray seated it better. “Say again,” he whispered.

“Can you follow the trail?” Painter Crowe asked.

“Yes…but I don’t know for how long. The readings are weak.” Gray had suggested his current plan of action. He studied the device in his hand, a Gamma-Scout portable radiation detector. Its halogen-filled Geiger-Müller tube was sensitive enough to pick up trace radiation, especially when attuned to the specific strontium 90 isotope detected in Polk’s body. Gray had hoped that a residual trace signature might have been left behind, the radiological equivalent of a scent trail. And it seemed to be working.

“Do your best, Gray. Any information on the professor’s whereabouts these past days could be crucial. I already have a call in to his daughter, but I’ve been unable to reach her.”

“I’ll follow this as far as I can.” Gray continued down the sidewalk, monitoring the detector. “I’ll report in if I discover anything.”

Gray signed off and continued alongside the national Mall. After another half block, the signal suddenly died on his device. Swearing, he stopped, retreated, and bumped into the bodyguard shadowing him.

“Damn it, Pierce,” the man grumbled. “I just polished these shoes.”

Gray glanced over a shoulder to the muscled mountain behind him. Joe Kowalski, a former seaman with the navy, was dressed in a sportcoat and slacks. Both fit him poorly. With hair razored to a black stubble and a nose knotted by an old break, he looked more like a shaved gorilla forced into a wrinkled suit.

Kowalski bent down and used the cuff of his sportcoat to polish up his shoe. “I paid three hundred bucks for these. They’re chain stitch Chukkas imported from England. I had to special order them in my size.”

Cocking an eyebrow, Gray glanced up from his Gamma-Scout reader.

Kowalski seemed to realize he might have said too much. His expression turned sheepish. “Okay. I like shoes. So what? I had a date, but…well…she canceled.”

Smart lady.

“Sorry about that,” Gray offered aloud.

“Well…at least they’re not scratched,” Kowalski said.

“I meant sorry about being stood up.”

“Oh. Yeah.” He shrugged. “Her loss.”

Gray didn’t bother arguing. He returned his attention to his handheld reader and turned in a slow circle. A step to the right, he caught the radioactive scent again. It angled away from the sidewalk and trailed across the grassy Mall. “This way.”

The professor’s route took them through the Mall’s Sculpture Garden across from the Hirshhorn Museum. Gray followed Polk’s steps into the shady, sunken oasis, and out again. Beyond the garden, Polk’s path continued across the Mall, edging alongside the tents of a Labor Day media event that was still being dismantled.

Gray glanced back to the sunken garden, studying the professor’s path. “He was trying to keep out of sight.”

“Or maybe the guy was just hot,” Kowalski countered, wiping his sweaty brow.

Gray searched around. To the west, the Washington Monument pointed toward the blistering sun; to the east rose the dome of the U.S. Capitol Building.

Needing answers, Gray continued. The digital readout on the Gamma-Scout slowly faded as he crossed the Mall. With each step, he watched the millirems of radiation ticking downward.

Reaching the far side of the Mall, Gray hurried across Madison Drive. He picked up the trail again as it entered another park. The signal grew stronger as Gray neared a shadowy copse of red-twig dogwood and Natchez crape myrtles. A bench stood next to a knee-high bed of hydrangeas.

Gray stepped to the bench.

In the secluded spot, the millirems ticked up higher again.

Had Polk waited here? Was that why the residual radiation trace was stronger?

Gray shifted a flowering branch of a crape myrtle and found a wide view of the Mall stretching ahead, including a straight-on view of the Smithsonian Castle. Had the professor waited here until he thought it was safe? Gray squinted against the glare of the sun. He remembered Malcolm’s diagnosis, the debilitation, the wasting. Polk had been on his last legs. Desperation must have finally drawn him out.

Why?

Gray began to step away when Kowalski cleared his throat. He was on one knee, dusting a shoe, but his other arm reached under the bench. “Look at this,” he said and stood. Turning, he held a tiny pair of binoculars.

Gray shifted the detector closer to the scopes. The readings spiked higher. “They’re hot.”

Kowalski grimaced and thrust out the binoculars by their neck strap. “Take ’em, take ’em.”

Gray retrieved the binoculars. His partner’s fears were baseless. While there was radiation, it was only moderately worse than the usual background radiation.

Turning, Gray lifted the binoculars and peered through them toward the Castle. The view of the building swelled. He watched a figure pass along the front. Through the scopes, he made out the pedestrian’s features. Gray recalled Polk’s urgency when they’d neared each other. He’d dismissed it as a panhandler’s desperation for a bit of charity. He now suspected Polk had recognized him. Maybe it wasn’t solely desperation that had drawn him out. Had he spotted Gray crossing the Mall and come out of hiding to intercept him?

Gray dropped the binoculars into the lead-lined bag hung at his waist.

“Let’s go.”

Out of the copse of trees, Gray followed the trail west along Madison Drive to a set of steps.

The trail turned up them.

Gray lifted his head and found himself facing the Mall entrance to one of the Smithsonian’s most famous museums: the National Museum of Natural History. It housed a massive collection of artifacts from around the world—ecological, geological, and archaeological—ranging from tiny fossils to a full-scale T-rex.

Gray craned his neck. The museum’s dome loomed above a triangular portico supported by six giant Corinthian pillars. Staring upward, he was suddenly struck by how much the museum’s facade looked like the Greek temple on the professor’s coin.

Could there be a connection?

Before he followed the trail inside, he knew he’d better report in with central command. Stepping off to the side, he leaned on the stone balustrade and switched on his encrypted radio. He reached Director Crowe immediately.

“Have you found something?” Painter asked.

Gray kept his voice to a faint whisper. “Looks like the professor’s trail leads inside the Smithsonian’s natural history museum.”

“The museum…?”

“I’ll continue the search inside. But was there any connection between him and this place?”

“Not that I’m aware. But I’ll check into past associates.”

Gray remembered an earlier snippet of conversation about Dr. Polk’s past. “Director Crowe, one other thing. You never did explain something.”

“What’s that, Commander?”

“You said the professor invented Sigma Force. What did you mean by that?”

Silence stretched for a bit, then Painter continued. “Gray, what do you know about an organization called the Jasons?”

Taken aback by the odd question, Gray could not even fathom the context. “Sir?”

“The Jasons are a scientific think tank formed back during the Cold War. They included leaders in their respective fields, many Nobel Prize winners. They banded together to offer advice to the military elite about technological projects.”

“And Professor Polk was a member?”

“He was. Over the years, the Jasons proved to be of great value to the military. They met each summer and brainstormed on new innovations. And to answer your question, it was during one such meeting that Archibald Polk suggested the formation of a militarized team of investigators to serve DARPA, to act as field operatives for the agency.”

“And so Sigma was born.”

“Exactly. But I’m not sure any of this is significant in regard to his murder. From what I’ve heard so far, Polk’s not been active with the Jasons for years.”

Gray stared up at the towering Greek facade. “Maybe one of his fellow Jasons worked here at the museum? Maybe that’s why he came?”

“That’s a good point of investigation. I’ll look into it, but it might take some time to root out. Over these past few years, their organization has become more and more secretive. Divided among various top secret projects, Jasons don’t even know what other Jasons are doing nowadays. But I’ll keep making calls.”

“And I’ll keep following this trail.” He signed off and waved to Kowalski. “C’mon. We’re going inside.”

“About time we got out of the goddamn sun.”

Gray didn’t argue. Stepping through the doors, he appreciated the shadowy, air-conditioned interior. The museum was free to the public, but Gray flashed his glossy black I.D. card to the guard who manned the metal detector.

He was waved through.

Pushing into the main rotunda, Gray was struck by the sheer size of the space. The rotunda was octagonal in shape and rose three stories, each level lined by more pillars, leading to the massive Guastavino-tiled dome. Sunlight streamed through clerestory windows and a central oculus.

Closer at hand, in the center of the rotunda, stood one of the museum’s mascots, an eight-ton African bull elephant. It posed with raised trunk and curved tusks amid a field of dry grass. Polk’s path led around the elephant and toward a public staircase.

As Gray followed, he noted a banner hung high on the wall to the left. It advertised an exhibit opening next month. It depicted the head of Medusa, her hair wild with twisting snakes, reflected on a circular shield. Staring upward, Gray’s feet slowed.

He pictured Polk’s strange coin as he read the name of the upcoming exhibit, sensing he was on the right track.

LOST MYSTERIES OF GREEK MYTHOLOGY

6:32 P.M.

In the darkened room, the two men stared through the one-way glass into a child’s playroom. They sat in leather club chairs, while behind them climbed four rows of stadium seating, all empty at the moment.

This was a private meeting.

Beyond the mirrored glass, the neighboring room was brightly lit. The walls were painted white, with just the barest hint of sky blue, a color that from psychological statistics was supposed to encourage a calming, meditative state. It held a daybed with a flowered comforter, an open box of toys, and a child-size desk.

The older of the two men sat straight in his seat. At his side was a scuffed valise that held a disassembled Dragunov sniper rifle.

The other man, at fifty-seven years of age, was twenty years younger than his Russian companion. He slouched in a pressed suit. His eyes were fixed on the girl as she stood in front of a plastic easel and shuffled through a tray of pastel felt markers. She had spent the last half hour meticulously drawing a rectangle in green upon the white sheet of butcher paper attached to the easel. She had run the marker around and around in a hypnotically rhythmic pattern.

“Dr. Raev,” the man said, “I don’t mean to harp, but are you absolutely certain Dr. Polk did not have it on his person?”

Dr. Yuri Raev sighed. “I have spent my life on this project.” And my soul, he added silently. “I will not have it ruined when we are so close.”

“So then where is it? We turned over that cheap motel he stayed in last night. Nothing. It would raise too many questions if it should end up in unfriendly hands.”

Yuri glanced at the man in the neighboring seat. John Mapplethorpe, a division chief for the Defense Intelligence Agency, had a long face with sagging jowls and bags under his eyes, as if he were made of candle wax and been left too long in the sun. Even the dye he used on his hair was too dark, too obvious a vanity for his age. Not that Yuri had any right to fault a man for attempting to stem the tide of age. Beneath the sag of his own skin, Yuri’s body remained toned, his reflexes sharp, and his mind as quick and agile as it ever had been. Between injections of androgens and growth hormone, along with vigorous exercise, he fought as adamantly as anyone to hold back time. But it was not vanity that drove him.

He stared into the room.

No, not vanity.

Mapplethorpe drummed his fingers on the arm of his chair. “We must recover what Polk stole.”

“He did not have it with him,” Yuri assured Mapplethorpe more forcefully. “It is too large to conceal on his person, even under a jacket. I was fortunate to stop him when I did. Before he spoke to anyone.”

“I hope you’re right. For all our sakes.” Mapplethorpe turned his attention back to the room. “And she was able to track him? All the way from Russia.”

Yuri nodded. Fatherly pride entered his voice. “With her and her twin brother, we may have finally breached the barrier.”

“Too bad she couldn’t have been quicker.” Mapplethorpe made a dismissive sound. “My brother-in-law’s daughter has an autistic boy. Did I ever tell you that? But he’s not an idiot savant. He can hardly tie his shoes.”

Yuri bristled. “The preferable term is autistic savant.”

The other man shrugged.

Yuri’s distaste for the American continued to grow. Like Mapplethorpe, few people really understood autism, even in the medical profession. Yuri knew the disorder intimately. It was in fact a spectrum of disorders, characterized by weaknesses in communication skills and social interaction, along with abnormal responses to sensations. This led tragically to children with delayed and compromised language and speech abilities, repetitive motor mannerisms and tics, preoccupation with objects, and often dysfunctional ways of relating to events or people.

But sometimes such a disorder generated miracles.

In rare instances, an autistic child demonstrated an astonishing brilliance in a narrow specialized field, such as mathematics, music, or art. And while 10 percent of autistic children demonstrated some degree of such savant talent, what interested Yuri were those rarest of individuals, known as prodigious savants, those few who arose with talent that stretched the very definition of genius. Worldwide, there were fewer than forty such individuals. But even among such exceptional individuals, a handful rose who dwarfed the others.

They arose from one genetic line.

An old Gypsy word echoed in his head.

Chovihanis.

Yuri stared through the window at the dark-haired girl.

Mapplethorpe mumbled beside him. “We must not let anyone catch a hint of what we’re doing. Or the Nuremberg Nazi trials will look like traffic court.”

Yuri didn’t respond. Mapplethorpe barely comprehended the full scope of his research. But after the Berlin Wall fell, Yuri had needed new resources to continue his work. It took a full decade to slowly test the waters in America. It seemed hopeless; then the political climate suddenly changed. The global war on terror had forged new alliances and allegiances. Enemies became allies. But more important, the boundaries of propriety were breached. It was a new era, with a new morality. An old catchphrase was now law: the ends justified the means.

Any means.

As long as it was for the common good.

Yuri’s government had known this all along. It was only the Americans who were late in facing this harsh reality.

“What’s that girl doing?” Mapplethorpe asked.

Yuri snapped out of his own reverie. He stood up. Sasha was at the easel, a black felt marker in her hand. Her arm flew up and down the stretch of butcher paper. She stabbed and stroked, very angular. There seemed no pattern. She worked one corner, then another.

Mapplethorpe snorted at the mess. “I thought you said she was talented in art.”

“She is.”

Sasha continued to work. The rectangle she originally drew in green began to fill with black swirls and swipes. She held her other arm straight out from her body, stiff as a plank, as if she sought to balance herself against some force beyond this world.

Finally both arms fell to her sides.

She turned away from the easel, dropped into a cross-legged crouch, and rocked slightly. Her brow was sweaty. She reached to a discarded toy wooden block and began rhythmically turning it in her fingers, as if she were trying to solve some puzzle known only to her.

Yuri turned his attention to her artwork.

image

Mapplethorpe joined him. “What was that all about? It’s just gibberish.”

“Nyet.” Yuri accidentally slipped into Russian, but he was worried…very worried.

He hurried to the door that led into the next room. Mapplethorpe followed. As he entered the child’s room, Sasha just rocked and twiddled the block in her fingers. From past experience, Yuri knew she would be shut down for a while.

He also had learned a thing or two about Sasha’s talent.

Reaching the easel, he ripped the butcher sheet down.

“What are you doing?” Mapplethorpe asked.

Yuri turned the drawing upside down and clipped it back onto the easel. Sasha sometimes drew in reverse. It was not uncommon among autistic savants. They often experienced the world through very different senses. Numbers had sounds. Words had smells.

Yuri glanced over to Sasha.

Her brilliant blue eyes remained fixed on her toy block.

Yuri turned back and noted Mapplethorpe’s amazement. The man drew closer to the drawing. He pointed, wordless with astonishment. Finally words tumbled out. “Dear God…that looks like an elephant in the center.”

Yuri stared, too. His heart pounded in his throat. She shouldn’t have been able to do that unless triggered. It had been such sketches that had led them to Dr. Polk—drawings of the Mall, of the Smithsonian Castle—leading them to set up a sniper’s nest in an unwatched corner of the Mall. They’d had to move quickly, responding in two hours. There was a limit to Sasha’s range.

image

Mapplethorpe leaned closer. “The room it’s in. I think I know that place. I took my grandchild there only two weeks ago. It’s the rotunda of the natural history museum.”

Yuri frowned. “The one on the national Mall?”

Where his quarry had been hiding for so long today.

Mapplethorpe nodded.

Yuri stared toward the mirror and saw only his own reflection. Had Sasha sensed them back there? And more important, had she sensed Mapplethorpe’s intense worry about what had been stolen by Dr. Polk?

There was only one way to find out.

Yuri pointed to the picture and spoke to Mapplethorpe. “I’d suggest you get your men over there. Immediately.”

6:48 P.M.

Gray continued deeper into the museum. Past the central rotunda with its stuffed elephant, Polk’s radioactive path led directly to a public stairwell. Gray followed it past the next floor and down farther again. It finally ended at a security door marked MUSEUM PERSONNEL ONLY. NO ADMITTANCE.

Gray tested the door. It was secured with an electronic lock. It required a magnetic employee card to pass through here. Gray frowned. So how did Polk get through here? Gray touched his throat mike and patched a call to central command.

Painter answered immediately. “Commander?”

“Sir, I need some help.” Gray explained where the trail ended. “I’ll need access past this point.”

“Hang tight, Gray. I’m going to upgrade your I.D. card’s clearance to encompass the Smithsonian museums.” Silence stretched for a bit. Gray imagined the director tapping at his computer.

Next to him, Kowalski leaned on the neighboring wall and whistled through his teeth.

“Try it now,” Painter finally said.

Gray swiped his card. He heard the lock’s tumblers release. “Got it. I’ll let you know what we find.”

Ending the call, Gray ducked through the door and set off into the off-limit spaces of the museum. It was not all that different from the rest of the building, if only slightly more utilitarian: marble floors honed to a lustrous sheen by decades of shuffling feet, wan fluorescent lighting, and wooden doors whose frosted glass windows were etched with scholarly enterprises.

ENTOMOLOGY, INVERTEBRATE ZOOLOGY, PALEOBIOLOGY, BOTANY.

The trail led through the maze—then the readings jostled higher as they approached an unmarked door. Gray waved the Gamma-Scout reader toward its handle. The digital numbers spiked. Stepping back, Gray noted a fainter trail continued down the hall. The hallway ahead ended at a cavernous space, lined on the far side by large steel roll-up doors. The museum’s loading docks. Gray stared up and down the hall, picturing a ghostly version of Polk. The professor must have entered the museum through the docks, then continued out the museum’s front door.

Had he done that to shake a tail?

Kowalski tried the door handle. “Unlocked,” he said and proved it by swinging the door open.

The dark space ahead smelled of dust, dry hay, and a hint of cedar.

Gray reached inside and found a light switch. He flicked it on. Racks and shelves filled the back half of a cavernous space. Wooden crates with shipping labels stapled to them were stacked in a pile along one side. Several had been cracked open. Old packing straw and more modern Styrofoam packing peanuts littered the floor.

A storage room.

To the left of the door, a single desk supported a computer and printer. Tables stretched along the other side, crowded with pottery and sections of decorated stone blocks. Someone had been taking inventory. Several larger objects rested on wooden floor pallets deeper in the room: a marble statue of a woman with her arms broken away, a corroded bronze sculpture of a bull’s head, a base of a stone pillar.

Gray followed the trail inside, wondering what had led the professor to trespass here. Had he just been hiding from a passing guard? But the professor’s path seemed direct. It led straight to one of the objects on the floor pallets, a dome of carved rock. The artifact stood waist-high with a hole on top. It looked like a granite model of a volcano, except it was covered with writing. Gray leaned closer to the inscriptions.

Ancient Greek.

Frowning, Gray tested it with the Gamma-Scout reader.

Polk’s trail circled around the pallet.

Gray traced the dead man’s footsteps. Why had Polk been fascinated with this artifact?

Before he could contemplate it further, a crash sounded to his left. He turned to see Kowalski backing away from one of the tables. He held the handle of an urn in his fingers. The rest of the vase lay shattered at his toes. “It…it broke.”

The man had a gift for the obvious.

Gray shook his head. He should have left Kowalski out in the hallway. He was like a bull in a china shop—only a bull had better self-control.

“It was wobbly, goddamn it.” Still, he sounded angry more at himself. “Come over here and see this.” He pointed the broken handle toward the table.

Gray stepped to his side. On the table were stacks of ancient Greek coins. From the gap in the second row, one of the coins was missing. Could it be Polk’s coin? Was this where he’d got ahold of it?

“I bumped the base. Tried to catch it.” Kowalski carefully placed the broken handle on the table. “It came apart in my hands.”

“Don’t worry about it. They’ll just take it out of your paycheck.”

“Damn it. How much do you think it cost?”

“A few hundred.”

A relieved whistle escaped him. “Well, that’s not too bad.”

“A few hundred thousand,” Gray clarified.

“Oh, sweet motherfu—”

Kowalski’s reaction was cut off by the rattle of the doorknob. Gray started to turn, but Kowalski’s thick mitt of a hand grabbed Gray’s upper arm and yanked him back. He shielded Gray with his own body while smoothly pulling a.45-caliber pistol from a shoulder holster.

The slight figure of a young woman entered. She was fumbling with her purse, oblivious of the two in the room. She even swiped blindly for the light switch until she seemed to realize two things at once: the lights were already on and a massive mountain of a man had a pistol leveled at her chest.

She squeaked and backed into the jamb, unable to find the doorway in her fright.

“Sorry,” Kowalski said and shifted his pistol toward the ceiling.

Gray hurried around the befuddled bodyguard. “It’s all right, ma’am. We’re museum security. We’re investigating a break-in.”

Kowalski pointed his pistol at the shattered vase on the floor. “Yeah, someone broke that.” He glanced to Gray for confirmation and collaboration as he holstered his weapon.

She clutched her purse to her chest. Her other hand fixed a pair of petite eyeglasses higher on her nose. With her chestnut hair cut in a bob and her small frame, she appeared to be no more than a college sophomore, but from the crinkled pinch of her eyes, bright with suspicion, she was probably a decade older.

“Can I see some identification?” she asked firmly and kept close to the open doorway.

Gray held up his black I.D. pass. It displayed his picture, along with the presidential seal embossed in gold. “I have a number you can call to confirm who we are.”

She squinted at the pass and seemed to relax slightly, but a tension remained in her shoulders. She stared around the room. “Was anything stolen?”

“Maybe you can better answer that,” Gray said, hoping she could help. “I noticed that there seems to be a coin conspicuously missing from the table here.”

“What?” She hurried over, abandoning any hesitation. With one look at the table, her expression fell into a forlorn look. “Oh, no…we had the collection on loan from the Delphi museum.”

Delphi again.

She glanced to the carved dome of rock, the one that seemed to have attracted Polk’s attention. It may have been because Kowalski was leaning on it. “Please don’t touch that.”

Kowalski straightened. He looked at his palm, as if it were to blame. He had the decency to blush around the collar. “Sorry.”

“May I ask what that is?” Gray said casually, nodding to the stone.

Her hands wrung together with worry. “The prize of the collection. For the upcoming exhibit. Thank God, it wasn’t vandalized by the thieves.” She circled it to be sure. “It’s over sixteen hundred years old.”

“But what is it?” Gray pressed.

“It’s called an omphalos. Which roughly translates as “navel.” In ancient Greece, the omphalos was considered to be the point around which the universe turned. There are many mythologies and stories associated with the omphalos, great powers attributed to it.”

“And how did you acquire it?”

She nodded to the table. “It came from the same collection as the rest. On loan from the museum at Delphi.”

“Delphi? Where the Oracle of Delphi had her temple?”

She glanced toward Gray, her expression surprised. “That’s right. The omphalos graced the inner sanctum of the temple. Its most holy chamber.”

“And this is that stone.”

“No. Sadly it’s only a replica. Until just recently, everyone thought this was the original omphalos, as described in the ancient histories of Plutarch and Socrates. But the sisterhood of Delphic oracles goes back three millennia, and this stone has been dated to half that age.”

“What happened to the original?”

“Lost to history. No one knows.”

She straightened and strode over to a smock hung on a peg by the door. Donning it, she removed her museum identification tag from her shirt and fixed it to the smock.

It was only then that Gray noted the tag. It bore her picture and her name beneath it.

POLK, E.

“Polk…,” he read aloud.

“Dr. Elizabeth Polk,” she said.

A tingle of misgiving iced through Gray. He suddenly knew why the professor had come here. “By any chance do you know an Archibald Polk?”

She fixed him with a more solid stare. “My father? Why?”