“Oh, forgive me. I just haven’t seen work this bad in years. To continue-according to the report, this is a pregnant female who was approximately twenty to twenty-five years of age. Now, the body was found-or, I should say, most of the body was found-in June 1955. That means this woman was most likely to have been born between 1930 and 1935. Most unfortunate. If she had been born just a few years later, her teeth might not have carried these stains.”

Here he pulled out the contents of the box, and there, grinning at us with brown teeth, was Hannah.

Although I had known what was in that box, it was still an unsettling sight. Her eye sockets staring out, areas around her nose and teeth obviously made up of fragments glued in place.

After the first shock of seeing her passed, I felt ashamed to be looking at her. Although I had just looked at cases full of skulls, I didn’t know anything at all about those people, while I had known at least one part of Hannah’s story. It dawned on me that nothing was private for a victim like her. Everything that could be, would be examined, studied, displayed, and written up by people she had never known.

“Just about the time she was born,” MacPherson went on, “a group of American dental researchers had figured out that high levels of fluoride in the water supplies caused this stain, but nothing was scientifically proven until about 1931, and it was sometime after that that the U.S. Public Health Service surveyed fluoride levels.

“As anyone who has waited for the tooth fairy knows, teeth are developed in childhood. The staining appears to occur partly from surface contact, but mainly from fluoride in the bloodstream. During the years of dental development-that is to say, in children under ten-those who ingest too much fluoride are likely to develop fluorosis. So your Jane Doe-I believe Mr. O’Connor called her Hannah-Hannah was most likely to have received these stains from the water she drank as a child.”

He stood up and paced the two or three steps he could pace in the area behind his desk. He gestured as he spoke, a natural showman.

“Fluoride occurs naturally in a great many substances. It occurs in varying levels in water supplies, generally low in most areas, especially in the Great Lakes region. There are primarily three regions of the country where the levels would be high enough to produce fluorosis.”

“So we might narrow down the areas she could come from by knowing she had this condition?” I asked.

“Precisely!” Bang! went the hand again. I won’t say we didn’t jump, but we were starting to brace ourselves whenever we saw him raise his hand near the desk.

“As I told Mr. O’Connor, your most likely candidates are three regions.” He counted them off on his hand. “They are: one, that part of the Midwest comprised of Indiana, Ohio, and Illinois; two, the Rocky Mountain area, especially South Dakota and Colorado; and three, the Southwest-Texas, New Mexico, Arizona.”

I didn’t think this did much narrowing, although I supposed it was better than nothing. Dr. MacPherson must have noticed my disappointment.

“You give up too easily, my dear. Your friend Mr. O’Connor was not so easily dismayed. Now, within these regions, there are only so many places with fluoride levels that could produce fluorosis this severe. But setting that aside for the moment, I must tell you that your previous coroner really did not follow up on a great many clues to her identity.”

“Such as?” Frank asked.

“According to the autopsy report, her skin was fairly tanned. This makes the Southwest the most likely candidate of the three regions, although she could have been from a farm or worked outdoors in the others. But we have other evidence that she was from the Southwest.

“The autopsy report also indicates that the time of death was about seven P.M. the evening she was found. Her stomach contents showed she had been killed shortly after she ate her dinner. Guess what she had eaten?”

Frank and I shrugged.

“Tacos!” he shouted, slamming his hand on the desk again. It must be harder than hell to doze off in this guy’s classes.

“This blond woman ate tacos for dinner in southern California in 1955! Now, there were Mexican restaurants then, of course, but Mexican food was not available through big chain restaurants all over the country.

“This is just a hypothesis, of course, but I believe that this woman may have spent at least some of her childhood years in a sunny border state, somewhere with a considerable Hispanic population. It had to be an area where high fluoride content in the water stained the local children’s teeth. I would say that narrows the field to Arizona, New Mexico, and Texas.”

“Can we be certain that she didn’t get the stains from fluoride added to the water supply or by fluoride tablets from a dentist?” Frank asked.

“Certain? No, nothing is certain. Reasonably sure? Yes. Fluoride wasn’t added to water in the United States until the mid-1940s, and Hannah here probably would have been too old to receive these stains then. But the most compelling reason to doubt it is that fluoride additions to water supplies are done very carefully, and at low levels. I believe stains like hers would be from a source three to four times higher in fluoride than the highest fluoride addition.”

“Is there any kind of listing of communities that might fit that level of natural fluoridation?” Frank asked.

“Of course. I’ve had copies of a fluoridation survey of the Southwest prepared for you.”

He thumbed through the papers and handed over a few pages. “I gave a copy of this same report to Mr. O’Connor. I’ve highlighted the communities which are the most likely candidates for this degree of fluorosis.”

“Thank you, Dr. MacPherson,” said Frank, glancing at the report. I tried to read over his shoulder.

“Of course,” MacPherson said as we read, “you’ll also want her picture.”

“What!” we shouted in unison, both startled into looking up at the old man.

MacPherson couldn’t have been more pleased with himself.

“The picture is what took so long. Amazing what these computers can do. I sent copies of the photos from the autopsy and measurements of the skull to a fellow who is quite good at visual reconstructions.”

From his papers, he pulled out a computer-generated drawing that, across the desk, did not look unlike a photo.

“Ladies and gentlemen,” he said, “allow me to introduce Hannah.”

LOOKING BACK AT US from the photo was an attractive young woman with medium-length, curled blond hair and a tan complexion. She had high cheekbones and dark, arching brows over dark eyes. The computer artist had given her make-up and a hairstyle circa 1955, and, with an understanding of human frailties, a closed-mouth smile.

The professor had several other views, a couple with smiles showing the stained teeth; there were even some with slightly different noses.

“The nose suffered the most damage in the violence done to her face,” MacPherson explained. “Interestingly, the eyes weren’t touched. As I said, this case was, in my opinion, badly mishandled. Had the head been severed and removed from the scene with the hands and feet, then I could understand the lack of progress. But this type of battering is not impossible to reconstruct-indeed, someone did take the time to remove the flesh from the skull, to painstakingly glue her skull back together, but then, it seems, did not proceed from there. The photos from the autopsy wouldn’t be a pretty sight for the lay person, but to someone who works in a field which constantly exposes him to the very worst sorts of damage human beings can suffer, it would not be so bad.”

At this point, he pulled out one of the autopsy photos. I guess I’m still a lay person; to me it looked awful. Frank didn’t flinch, though, so I suppose the professor was right.