The lower part of the face was chalky bone, a barely discernible human skull with open jaws and crumbling teeth. Most of the ears were gone, but from the eyes up, the flesh was cooked and so remarkably preserved that I could see the blond fuzz along the hairline. The forehead was intact, although slightly abraded by the removal of the glass, so that it was no longer smooth. If there had been wrinkles, I could not find them now.

'I can't figure out what the hell this is,' Fielding said as he examined the bits of material mingled with hair. 'It's everywhere, all the way down to her scalp.'

Some of it looked like burned paper, while other small pieces were pristinely preserved and a neon pink. I scraped some of it onto my scalpel and placed it into another carton.

'We'll let the labs take a crack at it,' I said to McGovern.

'Absolutely,' she answered.

The hair was eighteen and three-quarters inches long, and I saved a strand of it for DNA should we ever have a premortem sample for comparison.

'If we trace her back to someone missing,' I said to McGovern, 'and you guys can get hold of her toothbrush, we can look for buccal cells. They line the mucosa of the mouth and can be used for DNA comparison. A hairbrush would be good, too.'

She made a note of this. I moved a surgical lamp closer to the left temporal area, using a lens to painstakingly examine what appeared to be hemorrhage in tissue that had been spared.

'It seems we have some sort of injury here,' I said. 'Definitely not skin splitting or an artifact of fire. Possibly an incision with some sort of shiny debris imbedded inside the wound.'

'Could she have been overcome by CO and fallen and hit her head?' McGovern voiced the same question others had. 'She would have had to have hit it on something very sharp,' I said as I took photographs.

'Let me look,' Fielding said, and I handed him the lens. 'I don't see any torn or ragged edges,' he remarked as he peered.

'No, not a laceration,' I agreed. 'This looks more like something inflicted by a sharp instrument.'

He returned the lens to me, and I used plastic forceps to delicately scrape the shiny debris from the wound. I swiped it onto a square of clean cotton twill. On a nearby desk was a dissecting microscope, and I placed the cloth on the stage and moved the light source so that it would reflect off the debris. I looked through the eyepiece lens as I manipulated the coarse and fine adjustments.

What I saw in the circle of reflected illumination were several silvery segments that had the striated, flattened surfaces of metal shavings, such as the turnings made by a lathe. I fitted a Polaroid MicroCam to the microscope and took high-resolution instant color photographs.

'Take a look,' I said.

Fielding, then McGovern, bent over the microscope.

'Either of you ever seen anything like that?' I asked.

I peeled open the developed photographs to make certain they had turned out all right.

'It reminds me of Christmas tinsel when it gets old and wrinkled,' Fielding said.

'Transferred from whatever cut her,' was all McGovern had to say.

'I would think so,' I agreed.

I removed the square of white cloth from the stage and preserved the shavings between cotton balls, which I sealed inside a metal evidence button.

'One more thing for the labs,' I said to McGovern.

'How long will it take?' McGovern said. 'Because if there's a problem, we can do the work at our labs in Rockville.'

'There won't be a problem.' I looked at Fielding and said, 'I think I can handle it from here.'

'Okay,' he said. 'I'll get started on the next one.'

I opened up the neck to look for trauma to those organs and muscles, beginning with the tongue, which I removed while McGovern looked on with stoicism. It was a grim procedure that separated the weak from the strong.

'Nothing there,' I said, rinsing the tongue and blotting it dry with a towel. 'No bite marks that might be indicative of a seizure. No other injuries.'

I looked inside the glistening smooth walls of the airway and found no soot, meaning she was no longer breathing when heat and flames had reached her. But I also found blood, and this was further ominous news.

'More premortem trauma,' I said.

'Possible something fell on her after she was dead?' McGovern asked.

'It didn't happen that way.'

I noted the injury on a diagram and dictated it into the transmitter.

'Blood in the airway means she inhaled it - or aspirated,' I explained. 'Meaning, obviously, that she was breathing when the trauma occurred.'

'What sort of trauma?' she then asked.

'A penetrating injury. The throat stabbed or cut. I see no other signs of trauma to the base of the skull or lungs or to the neck, no contusions or broken bones. Her hyoid's intact, and there's fusion of the greater horn and body, possibly indicating she's older than twenty and most likely wasn't strangled manually or with a ligature.'

I began to dictate again.

'The skin under the chin and superficial muscle are burned away,' I said into the small mike on my gown. 'Heat-coagulated blood in the distal trachea, primary, secondary, and tertiary bronchi. Hemoaspiration, and blood in the esophagus.'

I made the Y incision to open up the dehydrated, ruined body, and for the most part, the rest of the autopsy proved to be rather routine. Although the organs were cooked, they were within normal limits, and the reproductive organs verified the gender as female. There was blood in her stomach, too; otherwise it was empty and tubular, suggesting she hadn't been eating very much. But I found no disease and no other injuries old or new.

Height I could not positively ascertain, but I could estimate by using Trotter and Gleser regression formula charts to correlate femur length to the victim's stature. I sat at a nearby desk and thumbed through Bass's Human Osteology until I found the appropriate table for American white females. Based on a 50.2 millimeter, or approximately twenty-inch, femur, the predicted height would have been five-foot-ten.

Weight was not so exact, for there was no table, chart, or scientific calculation that might tell me that. In truth, we usually got a hint of weight from the size of clothing left, and in this case, the victim had been wearing size eight jeans. So based on the data I had, I intuited that she had been between one hundred and twenty and one hundred and thirty pounds.

'In other words,' I said to McGovern, 'she was tall and very slim. We also know she had long blond hair, was probably sexually active, may have been comfortable around horses, and was already dead inside Sparkes's Warrenton house before the fire got to her. I also know that she received significant premortem injury to her upper neck and was cut right here on her left temple.' I pointed. 'How these were inflicted, I can't tell you.'

I got up from my chair and gathered paperwork while McGovern looked at me, her eyes shadowed by thought. She took off her face shield and mask and untied her gown in back.

'If she had a drug problem, is there any way you might be able to tell that?' she asked me as the phone rang and rang.

'Toxicology will certainly tell us if she had drugs on board,' I said. 'There may also be crystals in her lungs or foreign body granulomas from cutting agents like talc, and fibers from the cotton used to strain out impurities. Unfortunately, the areas where we might be most likely to find needle tracks are missing.'

'What about her brain? Would chronic drug abuse cause any damage that you might be able to see? For example, if she started having severe mental problems, was getting psychotic and so on? It sounds like Sparkes thought she had some sort of mental illness,' McGovern then said. 'For example, what if she were depressive or manic-depressive? Could you tell?'