“These bones are awfully clean for having been buried in the earth for forty years,” he said.

“It used to be that skeletons received by the Museum were thoroughly cleaned,” Sandoval replied. “They didn’t realize back then that the dirt itself was a valuable part of the specimen and should be preserved.”

Pendergast glanced into the tray for a minute. Then, reaching in, he carefully removed the skull, minus the jaw. He held it out in front of him — for all the world, D’Agosta thought, like Hamlet standing in the grave of Yorick.

“Interesting,” he murmured. “Most interesting indeed. Thank you, Mr. Sandoval.” Then he returned the skull to the tray, nodded to the technician that the interview was concluded, and — removing his gloves — led D’Agosta back down the passageway toward the land of the living.

The Executive Dining Room — or the EDR, as it was commonly known — was located on the second-to-top floor of One Police Plaza. It was where the police commissioner, the deputy commissioner, and other departmental princelings held court during the lunch hour. D’Agosta had been inside only once — for a celebratory luncheon the day he and two dozen others had made lieutenant — and while the room itself looked like a time capsule of cheesy early 1960s interior decor, the views of Lower Manhattan offered by the floor-to-ceiling windows were stunning.

As he waited in the capacious anteroom outside the EDR, however, D’Agosta wasn’t thinking about the view. He was watching the faces filing out, looking for Glen Singleton. It was the third Wednesday of the month — the day when the chief lunched with all departmental captains — and he knew Singleton would be among them.

All at once he spied the well-dressed, well-groomed form of Singleton. Quickly, D’Agosta threaded his way through the throng until he reached the captain’s side.

“Vinnie.” Singleton looked surprised to see him.

“I heard you wanted to see me,” D’Agosta said.

“I did. You didn’t have to hunt me down, though. It could’ve waited.”

D’Agosta had checked with Singleton’s secretary and learned the captain had a full afternoon. “No problem. What’s up?”

They had been walking in the general direction of the elevator, but now Singleton stopped. “I read your report on the Marsala killing.”

“Oh?”

“Fine job, under the circumstances. I’ve decided to put Formosa in charge, and I’m giving you that Seventy-Third Street homicide instead. You know, the jogger who got her throat slashed fighting off a mugger. It looks like a solid case with several eyewitnesses and good forensics. You can handpick your men from the Museum case to transfer over.”

This was basically what D’Agosta had expected to hear. It was also why he had tracked Singleton down to the Executive Dining Room — he wanted to catch the captain before things went too far. Formosa… he was one of the newest lieutenants on the force, still wet behind the ears.

“If it’s just the same to you, sir,” he said, “I’d like to stay on the Museum case.”

Singleton frowned. “But your report. It’s not a good case, really. The lack of hard evidence, lack of witnesses…”

Over Singleton’s shoulder, D’Agosta saw his new bride, Laura Hayward, emerge from the Executive Dining Room, her lovely figure framed through the tall windows by the Woolworth Building. She saw him, smiled instinctively, began to come over, noticed he was talking to Singleton, and satisfied herself with a wink before heading to the elevator bank.

D’Agosta looked back at Singleton. “I know it’s a heartbreaker, sir. But I’d like just another week with it.”

Singleton stared at him curiously. “This reassignment isn’t a slap on the wrist, if that’s what you’re thinking. I’m giving you a decent, solvable, high-profile case that will help your clearance.”

“I wasn’t thinking that, Captain. I read about the jogger murder, I know it would be a hell of an assignment.”

“Then why stay with the Marsala homicide?”

The day before, he’d been ready — eager — to slough it off onto some other poor sap. “I’m not sure, sir,” he replied slowly. “Not exactly. It’s just that I hate walking away from a case. And sometimes you get a sixth sense, a hunch, that something’s about to break. You probably know the feeling yourself, Captain.”

It was a hunch, D’Agosta realized, that happened to be named Pendergast.

Singleton looked at him another moment — a long, appraising moment. Then the ghost of a smile appeared on his face and he nodded. “I do indeed,” he said. “And I’m a great believer in hunches. All right, Vinnie — you can stay on the case. I’ll give the jogger homicide to Clayton.”

D’Agosta swallowed just a little painfully. “Thank you, sir.”

“Good luck. Keep me informed.” And with another nod, Singleton turned away.

As Pendergast entered the cluttered Museum office, Dr. Finisterre Paden quickly ushered him to the chair reserved for visitors.

“Ah, Agent Pendergast. Please have a seat.” The diffident tone of his phone message two days earlier was gone. Today the man was all smiles. He seemed pleased with himself.

Pendergast inclined his head. “Dr. Paden. I understand you have some new information for me?”

“I do. I do, indeed.” The mineralogist rubbed his chubby hands together. “I must confess, Mr. Pendergast — you will keep this between ourselves, I trust? — to feeling a degree, the very slightest degree, of chagrin.” He unlocked a drawer, reached inside, took out a soft cloth, unwrapped it to reveal the stone, then gave it a brief, almost caressing touch.

“Beautiful. How utterly beautiful.” The mineralogist seemed to recollect himself, and he passed the stone over to Pendergast. “In any case, since the stone was not immediately recognizable to me, or included in the obvious sources, I resorted to researching its chemical signature, refractive index, and other such avenues of attack. The fact is, I… ahem, not to put too fine a point on it… didn’t see the forest for the trees.”

“I’m not quite sure I follow you, Dr. Paden.”

“I should have been focusing on the appearance of the stone, rather than its chemical qualities. I told you from the start that your specimen was of a most unusual color, and that its spiderweb matrix is the most valuable of all. But you may recall I also told you that this deep-indigo turquoise is found in only three states. And that is true — save for one exception.”

He reached over to his color laser printer, plucked a sheet from its bin, and handed it to Pendergast.

The agent gave it a quick glance. The sheet appeared to contain an item from a jeweler’s catalog, or perhaps an auction listing. There were a few paragraphs of descriptive text, along with a photograph of a precious stone. While it was significantly smaller than the stone found in Alban’s stomach, in all other respects it appeared almost identical.

“The only azure American turquoise found outside of those three states,” Paden said almost reverently. “And the only azure turquoise with a golden spiderweb matrix that I’ve ever encountered.”

“Where did it come from?” Pendergast asked in a very low voice.

“From an obscure mine in California, known as the Golden Spider. It’s a very old mine, played out over a hundred years ago, and it wasn’t in any of the obvious books or catalogs. Even so, the stone is so unusual I feel I should have recognized it. But the mine was small, you see, with a very low output — the estimate is that no more than fifty or sixty pounds of top-grade turquoise was mined from it. It was that obscurity — and the California location — that tripped me up.”

“Where in California?” Pendergast asked, his voice even quieter.

“On the edge of the Salton Sea, northeast of Anza-Borrego and south of Joshua Tree National Park. A most unusual location, especially from a mineralogical perspective, because the only—”