The three of us spent the next hour drafting the language in Abby's article.

"We can't have attribution," she insisted. "No way. If these quotes are attributed to the chief medical examiner, it will sound fishy because you've refused to talk in the past. And you've been ordered not to talk now. It's got to look like the information was leaked."

"Well," I commented dryly, "I suppose you can pull your famous *medical source' out of your hat."

Abby read the draft aloud. It didn't set well with me. It was too vague. "Alleged" this and "possible" that.

If only we had his blood. The enzyme defect, if it existed, could be a.s.sayed in his leukocytes, his white blood cells. If only we had something.

As if on cue my telephone buzzed. It was Rose. "Dr. Scarpetta, Sergeant Marino's here. He says it's urgent."

I met him in the lobby. He was carrying a bag, the familiar gray plastic bag used to hold clothing connected to criminal cases.

"You ain't gonna believe this." He was grinning, his face flushed. "You know Magpie?"

I was staring at the bulging bag, my confusion apparent.

"You know, Magpie. All over the city with all his earthly belongings in a grocery cart he swiped somewhere. Spends his hours rummaging through garbage cans and Dumpsters."

"A street person?" What was Marino talking about?

"Yo. The Grand Dragon of street persons. Well, over the weekend he's fishing around in this Dumpster less than a block from where Henna Yarborough was whacked and guess what? He finds himself a nice navy blue jumpsuit, Doc. Flips him right out because the d.a.m.n thing's stained with blood. He's a snitch of mine, see. Has the brains to stuff the thing in a trash bag, and he's been wheeling the d.a.m.n thing around for days, looking for me. So he waves me down on the street a little while ago, charges me the usual ten-spot, and Merry Christmas."

He was untwisting the tie around the top of the bag. "Take a whiff."

It almost knocked me over, not just the stench of the days-old b.l.o.o.d.y garment but a powerful maple-sweetish, sweaty odor. A chill ran down my spine.

"Hey," Marino went on, "I bopped by Petersen's apartment before I come over here. Had him take a whiff."

"Is it the odor he remembers?"

He shot his finger at me and winked. "Bingo."

For two hours Vander and I worked on the blue jumpsuit. It would take a while for Betty to a.n.a.lyze the bloodstains, but there was little doubt in our minds the jumpsuit was worn by the killer. It sparkled under the laser like mica-flecked blacktop.

We suspected when he a.s.saulted Henna with the knife he got very b.l.o.o.d.y and wiped his hands on his thighs. The cuffs of the sleeves were also stiff with dried blood. Quite likely it was his habit to wear something like a jumpsuit over his clothes when he struck. Maybe it was routine for him to toss the garment into a Dumpster after the crime. But I doubted it. He tossed this one because he made this victim bleed.

I was willing to bet he was smart enough to know bloodstains are permanent. If he were ever picked up, he had no intention of having anything hanging in his closet that might be stained with old blood. He had no intention of anyone's tracing the jumpsuit either. The label had been removed.

The fabric looked like a cotton and synthetic blend, dark blue, the size a large or perhaps an extra-large. I was reminded of the dark fibers found on Lori Petersen's window sill and on her body. There were a few dark fibers on Henna's body as well.

The three of us had said nothing to Marino about what we were doing. He was out on the street somewhere, maybe at home drinking beer in front of the TV. He didn't have a clue. When the news broke, he was going to think it was legitimate, that the information was leaked and related to the jumpsuit he turned in and to the DNA reports recently sent to me. We wanted everybody to think the news was legitimate.

In fact, it probably was. I could think of no other reason for the killer's having such a distinctive body odor, unless Petersen was imagining things and the jumpsuit just happened to be tossed on top of a Mrs. b.u.t.terworth's maple syrup bottle inside the Dumpster.

"It's perfect," Wesley was saying. "He never thought we'd find it. The toad had it all figured out, maybe even knew where the Dumpster was before he went out that night. He never thought we'd find it."

I stole a glance at Abby. She was holding up amazingly well.

"It's enough to run with," Wesley added.

I could see the headline: DNA, NEW EVIDENCE: SERIAL KILLER MAY HAVE METABOLIC DISORDER If he truly did have maple syrup urine disease, the front-page story ought to knock him off his feet.

"If your purpose is to entice him with the OCME computer," Abby said, "we have to make him think the computer figures in. You know, the data are related."

I thought for a minute. "Okay. We can do that if we say the computer got a hit on a recent data entry, information relating to a peculiar smell noted at one of the scenes and a.s.sociated with a recently discovered piece of evidence. A search hit on an unusual enzyme defect that could cause a similar odor, but sources close to the investigation would not say exactly what this defect or disease might be, or if the defect has been verified by the results of recently completed DNA tests."

Wesley liked it. "Great. Let him sweat."

He didn't catch the pun.

"Let him wonder if we found the jumpsuit," he went on. "We don't want to give details. Maybe you can just say the police refused to disclose the exact nature of the evidence."

Abby continued to write.

I said, "Going back to your *medical source,' it might be a good idea to have some pointed quotes coming from this person's mouth."

She looked up at me. "Such as?"

I eyed Wesley and replied, "Let this medical source refuse to reveal the specific metabolic disorder, as we've agreed. But have this source say the disorder can result in mental impairment, and in acute stages, r.e.t.a.r.dation. Then add, uh a " I composed out loud, "An expert in human genetics stated that certain types of metabolic disorders can cause severe mental r.e.t.a.r.dation. Though police believe the serial killer cannot possibly be severely mentally impaired, there is evidence to suggest he might suffer a degree of deficiency that manifests itself in disorganization and intermittent confusion."

Wesley muttered, "He'll be off the wall. It will absolutely enrage him."

"It's important we don't question his sanity," I continued. "It will come back to haunt us in court."

Abby suggested, "We'll simply have the source say so. We'll have the source distinguish between slowness and mental illness."

By now, she had filled half a dozen pages in her reporter's notepad.

She asked as she wrote, "This maple syrup business. Do we want to be that specific about the smell?"

"Yes," I said without pause. "This guy may work around the public. He's going to have colleagues, if nothing else. Someone may come forward."

Wesley considered. "One thing's d.a.m.n certain, it will further unhinge him. Should make him paranoid as h.e.l.l."

"Unless he really doesn't have a weird case of B.O.," Abby said.

"How is he going to know he doesn't?" I asked.

Both of them looked surprised.

"Ever heard the expression, *A fox never smells its own'?" I added.

"You mean he could stink and not know it?" she asked.

"Let him wonder that," I replied.

She nodded, bending over her notepad again.

Wesley settled back in his chair. "What else do you know about this defect, Kay? Should we be checking out the local pharmacies, see if someone buys a lot of oddball vitamins or prescription drugs?"

"You could check to see if someone regularly comes in to buy large doses of B1," I said. "There's also MSUD powder, a dietary supplement available. I think it's over-the-counter, a protein supplement. He may be controlling the disease through diet, through a limiting of normal high-protein foods. But I think he's too careful to be leaving those kinds of tracks, and in truth, I don't think his disease has been acute enough for him to be on a very restricted diet. I suspect in order for him to function as well as he does he leads a fairly normal life. His only problem is he has a strange-smelling body odor that gets more noticeable when he's under stress."

"Emotional stress?"

"Physical stress," I replied. "MSUD tends to flare up under physical stress, such as when the person is suffering from a respiratory infection, the flu. It's physiological. He's probably not getting enough sleep. It takes a lot of physical energy to stalk victims, break into houses, do what he does. Emotional stress and physical stress are connected-one adds to the other. The more emotionally stressed he becomes, the more physically stressed he becomes, and vice versa."

"Then what?" I looked impa.s.sively at him.

"Then what happens," he repeated, "if the disease flares up?"

"Depends on whether it becomes acute."

"Let's say it does."

"He's got a real problem."

"Meaning?"

"Meaning, the amino acids build up in his system. He's going to get lethargic, irritable, ataxic. Symptoms similar to severe hyperglycemia. It may be necessary for him to be hospitalized."

"English," Wesley said. "What the h.e.l.l's ataxic mean?"

"Unsteady. He's going to walk around like he's drunk. He's not going to have the wherewithal to scale fences and climb through windows. If it gets acute, if his stress level continues to climb, and if he goes untreated, it could get out of control."

"Out of control?" he persisted. "We stress him - that's our purpose, right? His disease gets out of control?"

"Possibly."

"Okay."

He hesitated. "What next?"

"Severe hyperglycemia, and his anxiety increases. If it isn't controlled, he's going to get confused, overwrought. His judgment may be impaired. He'll suffer mood changes."

I stopped right there.

But Wesley wasn't going to let me. He was leaning forward in his chair, staring at me.

"You didn't just think of this maple syrup urine disease business, did you?" he pushed.

"It's been in my differential."

"And you didn't say anything."

"I wasn't at all sure," I replied. "I saw no reason to suggest it until now."

"Right. Okay. You say you want to rattle his cage, stress him right out of his mind. Let's do it. What's the last stage? I mean, what if his disease gets really bad?"

"He may become unconscious, have convulsions. If this is prolonged, it may lead to a severe organic deficit."

He stared incredulously at me as his eyes filled with comprehension. "Jesus. You're trying to kill the son of a b.i.t.c.h."

Abby's pen stopped. Startled, she looked up at me.

I replied, "This is all theoretical. If he's got the disease, it's mild. He's lived with it all his life. It's highly unlikely MSUD's going to kill him."

Wesley continued to stare. He didn't believe me.

Chapter 14.

I couldn't sleep all night. My mind wouldn't shut down and I tossed miserably between unsettling realities and savage dreams. I shot somebody and Bill was the medical examiner called to the scene. When he arrived with his black bag, he was accompanied by a beautiful woman I did not know a My eyes flew open in the dark, my heart squeezed as if by a cold hand. I got out of bed long before my alarm went off and drove to work in a fog of depression.

I don't know when in my life I'd ever felt so lonely and withdrawn. I scarcely spoke to anyone at the office, and my staff began to cast nervous, strange glances my way.

Several times I came close to calling Bill, my resolve trembling like a tree about to fall. It finally fell shortly before noon. His secretary brightly told me "Mr. Boltz" was on vacation and wouldn't be back until the first of July.

I left no message. The vacation wasn't planned, I knew. I also knew why he didn't say a word about it to me. In the past he would have told me. The past was past. There would be no resolution or lame apologies or outright lies. He'd cut me off forever because he couldn't face his own sins.

After lunch I went upstairs to serology and was surprised to find Betty and Wingo with their backs to the door, their heads together as they looked at something white inside a small plastic bag.

I said, "h.e.l.lo," and came inside.

Wingo nervously tucked the bag in a pocket of Betty's lab coat, as if slipping her money.

"You finished downstairs?" I pretended I was too preoccupied to have noticed this peculiar transaction.

"Uh, yeah. Sure am, Dr. Scarpetta," he quickly replied, on .his way out. "McFee, the guy shot last night released him a little while ago. And the burn victims coming in from Albemarle won't be in till four or so."

"Fine. We'll hold them until the morning."

"You got it," I heard him say from the hallway.

Spread out on the wide table in the center of the room was the reason for my visit. The blue jumpsuit. It looked flat and mundane, neatly smoothed out and zipped up to the collar. It could have belonged to anybody. There were numerous pockets, and I think I must have checked each one half a dozen times hoping to find anything that might hint at who he was, but they were empty. There were large holes cut in the legs and sleeves where Betty had removed swatches of bloodstained fabric.

"Any luck grouping the blood?" I asked, trying not to stare at the plastic bag peeking out of the top of her pocket.

"I've got some of it worked out." She motioned me to follow her to her office.

On her desk was a legal pad scribbled with notes and numbers that would look like hieroglyphics to the uninitiated.

"Henna Yarborough's blood type is B," she began. "We're lucky on that count because it's not all that common. In Virginia, about twelve percent of the population's type B. Her PGM's one plus, one-minus. Her PEP is A-one, EAP is CB, ADA-one and AK-one: The subsystems, unfortunately, are very common, up there in the eighty-nine percent and above of Virginia's population. "