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MARGO WASHED HER hands in the deep metal sink of the Forensic Anthropology lab, then dried them on a coarse hospital cloth. She glanced over at the gurney on which the sheeted remains of Pamela Wisher lay. The samples and observations had all been taken, and the corpse would be released to the family later that morning. Across the room, Brambell and Frock were at work on the unidentified skeleton, bending over its grotesquely twisted hips and taking elaborate measurements.

“If I may make an observation?” Dr. Brambell said, putting a vibrating Stryker saw to one side.

“Be my guest,” Frock replied in his buttery rumble, waving a hand magnanimously.

They detested each other.

Margo slipped two latex gloves onto each hand, turning to hide a smile. It was probably the first time she’d seen Frock face a man with an intellect, or an ego, equal to his own. It was a miracle that any work had been accomplished. Yet over the past few days they had performed antibody testing, osteological analysis, tests for toxic residues and teratogens, as well as numerous other procedures. All that remained was the DNA sequencing and forensic analysis of the teeth marks. Yet the unknown corpse remained a riddle, refusing to yield up its secrets. Margo knew this only added to the highly charged atmosphere within the lab.

“It should be obvious to the meanest intelligence,” Brambell was saying, his high Irish voice trembling with irritation, “that the puncture cannot have originated on the dorsal side. Otherwise, the transverse process would have been clipped.”

“I fail to see what clipping has to do with anything,” muttered Frock.

Margo tuned out the argument, most of which was uninteresting to her anyway. Her specialty was ethnopharmacology and genetics, not gross anatomy. She had other problems to solve.

She leaned over the latest gel electrophoresis run on tissue from the unidentified corpse, feeling her trapezius muscles cry out in protest as she reached forward. Five sets of ten reps with the upright rows the night before, instead of her normal three. She’d upped her workout routine dramatically over the last several days; she would have to be more careful not to overdo it.

Ten minutes of close scrutiny confirmed her suspicions: the dark stripes of the various protein elements could tell her little beyond being common human muscle proteins. She straightened up with a sigh. Any more detailed genetic information would have to come from the much more sensitive DNA sequencing machine. Unfortunately, reliable results would not be available for several more days.

As she placed the gel strips to one side, rubbing her shoulder thoughtfully, she noticed a manila envelope lying next to the SPARC-10 workstation. X rays, she thought. They must have arrived first thing this morning. Obviously, Brambell and Frock had been too busy arguing over the corpse to look at them. It was understandable: with a body that was almost completely skeletonized already, X rays weren’t likely to tell them very much.

“Margo?” Frock called.

She walked over to the examining table.

“My dear,” Frock said, pushing his wheelchair away and gesturing toward the microscope, “please examine this groove running down the right femur.”

The Stereozoom was on lowest power, yet it was still like gazing into another world. The brown bone leaped into view, revealing the ridges and valleys of a miniature desert landscape.

“What do you make of this?” he asked.

It wasn’t the first time Margo had been called to give an opinion in a dispute, and she didn’t relish the role. “It looks like a natural fissure in the bone,” she said, keeping her voice neutral. “Part of the suite of bone spurs and ridges that seem to have affected the skeleton. I wouldn’t necessarily say it was caused by a tooth.”

Frock settled back in his wheelchair, not quite able to mask a smile of triumph.

Brambell blinked. “I’m sorry?” he asked in disbelief. “Dr. Green, I don’t mean to contradict you, but that’s a longitudinal tooth mark if ever I saw one.”

“I don’t mean to contradict you, Dr. Brambell.” She switched the stereozoom to higher power, and the small fissure immediately turned into a vast canyon. “But I can see some natural pores along the inside, here.”

Brambell bustled over and looked into the eyepieces, holding his old horn-rims to one side. He stared at the image for several moments, then stepped away much more slowly than he had approached.

“Hmm,” he said, replacing his glasses. “It pains me to say it, Frock, but you may have a point.”

“You mean Margo may have a point,” said Frock.

“Yes, of course. Very good, Dr. Green.”

Margo was spared a reply by the ringing of the lab phone. Frock wheeled over and answered it energetically. Margo watched him, realizing that this was the first time she had really stopped to look at her old adviser since D’Agosta’s call had brought them back together the week before. Though still portly, he seemed thinner than she remembered from their days together at the Museum. His wheelchair, too, was different: old and scuffed. She wondered, in sudden sympathy, if her mentor had fallen on hard times. Yet if so, it hadn’t seemed to affect him adversely. If anything, he looked more alert, more vigorous, than during his tenure as Anthropology Department chairman.

Frock was listening, clearly upset about something. Margo’s gaze drifted away from him and up to the laboratory window and its gorgeous view of Central Park. The trees were rich with the dark green foliage of summer, and the reservoir shimmered in the brilliant light. To the south, several rowboats drifted lazily across the pond. She thought how infinitely preferable it would be in one of those boats—basking in the sun—instead of here in the Museum, pulling apart rotten bodies.

“That was D’Agosta,” Frock said, hanging up with a sigh. “He says our friend here is going to have some company. Close the blinds, will you? Artificial light is preferable for microscope work.”

“What do you mean, company?” Margo asked sharply.

“That’s how he put it. Apparently, they discovered a badly decomposed head during a search of some railroad tunnels yesterday afternoon. They’re sending it over for analysis.”

Dr. Brambell muttered something in fervent Gaelic.

“Does the head belong…” Margo began, then nodded in the direction of the corpses.

Frock shook his head, a somber expression on his face. “Apparently it’s unrelated.”

Silence descended on the lab for a moment. Then, as if on cue, the two men slowly returned to the unidentified skeleton. Soon, murmurs of dissent began to rise once again. Margo sighed deeply and turned back toward the electrophoresis equipment. She had at least a morning’s worth of cataloging to get through.

Her eye moved toward the X rays. They’d raised a fearful stink with the lab in order to get them that morning. Maybe she ought to take a quick look before starting the cataloging.

She slid out the first series, clipping them to the viewer. Three shots of the unidentified skeleton’s upper torso. As she expected, they showed—much less clearly—what they had already observed from direct examination: a skeleton suffering bizarre bone deformities, with a grotesque thickening and ridging of almost every osteological process in the body.

She pulled them down and slid the next series into the clips. Another set of three views, this time of the lumbar region.

She saw it immediately: four small spots, crisp and white. Curious, she swiveled the magnifier over for a closer look. The four spots were sharp triangles, arranged in a precise square at the very bottom of the spine, completely enclosed in a fused mass of bony growth. They had to be metal, Margo knew: only metal would be that opaque to X rays.

She straightened up. The two men were still bending over the cadaver, their mutterings floating toward her across the quiet room.

“There’s something over here you should take a look at,” she said.

Brambell reached the viewer first and peered closely. He stepped away, adjusted his horn-rims, and peered again.

Frock rumbled over a moment later, curious, brushing against the Medical Examiner’s legs in his haste. “If you don’t mind,” he said, using the heavy wheelchair to crowd Brambell off to the side. He leaned forward, face inches from the viewer.

The room fell silent except for the hiss of air from the duct above the gurney. For once, Margo thought, both Brambell and Frock were completely baffled.

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