“As for decoding it, I might have an idea about that—at least a place to start,” Selma said. “You remember the mystery man, ‘the Major’ who hired the smuggler, Arienne, to sail to Saint Helena?”

“Of course,” Remi said.

“I think I know who the Major is. I ran across an obscure German biography of Napoleon written in the 1840s. In 1779, when Napoleon was nine, he was sent to a French military school, Brienne-le-Château, near Troyes. There he met a boy named Arnaud Laurent and they became friends—all through École Royale Militaire college, then on to artillery school, and so on, all the way to Waterloo. According to the author, up until the mid 1790s, just before the First Italian Campaign, Laurent had been a step ahead of Napoleon in rank. It was said that in private or in close company Napoleon jokingly called Laurent ‘the Major.’ Napoleon had several confidants over the years, but none as close as Laurent.”

“Is there an estate?” Sam asked. “An Arnaud Laurent library, by chance?”

“No such luck. There’s not much out there on Laurent, but from what I gather, when he died in 1825, just four years after Napoleon, he was buried with what one article referred to as ‘his most prized possession.’ ”

“Which, with any luck, will be a handy-dandy decoder ring,” Sam said.

“Or book,” Remi added. “Selma, where’s he buried?”

“After his army was routed at Waterloo, Napoleon’s surrender was accepted aboard the HMS Bellerophon, along with Napoleon’s staff, which I’m guessing included Laurent, who was at the time his chief military adviser. Afterward the Bellerophon sailed to Plymouth, where after a two-week wait Napoleon was transferred to the HMS Northumberland—alone, with no staff—for the final voyage to Saint Helena. When Laurent died, his widow, Marie, asked the British for permission to have him buried on Saint Helena next to Napoleon, but they refused, so she did what she thought was next best thing: She had him laid to rest on Elba.”

“Strange,” Remi said.

“It’s poetic,” Sam replied. “Laurent’s general, his best friend, had died in exile and been buried in exile. His widow had chosen a spot of . . .” Sam searched for the right word. “Symbolic solidarity.”

Remi tilted her head at her husband. “That’s beautiful, Sam.”

“I have my moments. Selma, Napoleon’s remains . . . weren’t they moved from Saint Helena?”

“They were. Interesting story itself, really. In 1830 the Bourbons, who retook the throne after Napoleon’s defeat at Waterloo, were themselves overthrown by the Orléans dynasty. They were a little more nostalgic over Napoleon, so they petitioned the British for permission to bring him home. After seven years of wrangling, the Brits agreed and the remains were fetched from Saint Helena and returned to Paris. His official grave is under the dome of Les Invalides.

“Laurent’s grave is still on Elba—it’s a crypt, actually. The trick is, how do you handle it? I assume you’d prefer to avoid breaking in and playing tomb raiders.”

“Ideally,” Sam said.

“Then you’ve got to get permission. And as luck would have it, Laurent has a granddaughter, five or six times removed, living in Monaco.”

“Ah, Monaco in the spring,” Sam murmured. “How can we say no?”

“We can’t,” Remi chimed in.

CHAPTER 22

PRINCIPALITY OF MONACO, FRENCH RIVIERA

Sam pulled their rented olive green Porsche Cayenne SUV down the lilac-lined driveway and stopped before a four-story, white stucco terra-cotta-roofed villa overlooking the waters off Point de la Veille.

As it turned out, Arnaud Laurent’s distant granddaughter, Yvette Fournier-Desmarais, was embarrassingly wealthy, having inherited her late husband’s interests in a number of Monaco businesses, including a half dozen beach resorts and motor sporting clubs. According to the gossip rags she was, at age fifty-five, Monaco’s most eligible bachelorette and since her husband’s death fifteen years earlier had been courted by an impressive collection of Europe’s jet set, from princes to celebrities to captains of industry. She’d dated all of them, but none for longer than four months, and was rumored to have turned down dozens of marriage proposals. She lived alone in her villa with a modest staff and a Scottish deerhound named Henri.

Surprisingly, Sam and Remi had had little trouble arranging a meeting, first presenting their credentials and request to Ms. Fournier-Desmarais’s lawyer in Nice, who in turn agreed to contact his client. She’d e-mailed them directly within a day and insisted they come immediately.

They climbed out of the Porsche and walked into the front courtyard and along a path between a pair of bubbling fountains to the front door, twin slabs of mahogany and stained glass that rose four feet above their heads. Sam pressed the button on the wall and a soft chime sounded from within.

“ ‘A Marcia de Muneghu,’ ” Remi said.

“What?”

“The doorbell chime—it’s ‘A Marcia de Muneghu.’ The March of Monaco. It’s the national anthem here.”

Sam smiled. “Read some guidebooks on the plane, did we?”

“When in Rome . . .”

The door opened, revealing a rail-thin middle-aged man in matching navy blue slacks and polo shirt. “Mr. and Mrs. Fargo, yes?” His accent was British. He didn’t wait for a reply, but merely stepped aside and tipped his chin.

They stepped into the foyer, which was simply but tastefully done: light gray Egyptian slate on the floor and a soft Mediterranean blue plaster on the walls. A silver-framed mirror sat above a nineteenth-century English Sheraton painted demi-lune console table.

“My name is Langdon,” the man said, shutting the door. “The mistress is on the veranda. This way, please.”

They followed him down the hall, past the formal rooms to the private half of the house, then out a pair of French doors onto a mul titiered deck made from polished burled walnut.

“You’ll find her there,” Langdon said, gesturing up a set of stairs that wound along the villa’s outer wall. “If you’ll excuse me . . .” Langdon turned and disappeared back through the French doors.

“My God, look at that view,” Remi said, walking to the railing. Sam joined her. Below an embankment of rock outcrops, palm trees, and flowering tropical shrubs lay the breadth of the Mediterranean, a carpet of indigo stretching beneath a cloudless sky.

A female voice called, “It’s a sight I never tire of either.”

They turned. A woman in a plain white sundress and sunflower yellow broad-brimmed hat stood at the top of the steps. This was, they assumed, Yvette Fournier-Desmarais, but neither Sam nor Remi would have guessed her to be older than forty. Beneath the hat her face was tanned, but not baked, with barely perceptible laugh lines around a pair of hazel eyes.

“Sam and Remi, yes?” she asked, walking down the stairs, hand outstretched. “I’m Yvette. Thank you for coming.” Her English was excellent, with the slightest trace of a French accent.

They shook her hand in turn, then followed her up the stairs and around the back to an open-air sunroom draped in gauze curtains and appointed in teak chairs and chaise lounges. A large, sleek brown and black dog sitting in the shade beside one of the chairs started to rise upon seeing Sam and Remi, but sat back down again at his mistress’s soft, “Sit, Henri.” Once they were all settled, she said, “I’m not what you expected, am I?”

Sam replied, “To be honest, no, Mrs.—”

“Yvette.”

“Yvette. To be honest, no, you’re not at all.”

She laughed, her white teeth flashing in the sun. “And you, Remi, you were expecting someone more matronly perhaps, a French bejeweled snob with a poodle under one arm and a champagne flute in the other?”