“It’s good to meet you at last,” the doctor said. Under her hand was a three-inch-thick manila folder. Rhyme’s own, the criminalist assumed. (Wondering what the keeper of the file had entered under the prognosis heading: “Encouraging”? “Poor”? “Hopeless”?) “Lincoln, you and I’ve had some conversations on the phone. But I want to go through the preliminaries again. For both our sakes.”

Rhyme nodded curtly. He was prepared to tolerate some formality though he had little patience for ass-covering. Which is what this was starting to sound like.

“You’ve read the literature about the Institute. And you know we’re starting some trials of a new spinal cord regeneration and reconstruction technique. But I have to stress again that this is experimental.”

“I understand that.”

“Most of the quads I’ve treated know more neurology than a general practitioner. And I’ll bet you’re no exception.”

“Know something about science,” Rhyme said dismissively. “Know something about medicine.” And he offered her an example of his trademark shrug, a gesture Dr. Weaver seemed to notice and file away.

She continued, “Well, forgive me if I repeat what you already know but it’s important for you to understand what this technique can do and what it can’t do.”

“Please,” Rhyme said. “Go on.”

“Our approach at the Institute here is an all-out assault on the site of the injury. We use traditional decompression surgery to reconstruct the bony structure of the vertebrae themselves and to protect the site where your injury occurred. Then we graft two things into the site of the injury: One is some of the patient’s own peripheral nervous system tissue. And the other substance we graft is some embryonic central nervous system cells, which—”

“Ah, the shark,” Rhyme said.

“That’s right. Blue shark, yes.”

“Lincoln was telling us that,” Sachs said. “Why shark?”

“Immunologic reasons, compatibility with humans. Also,” the doctor added, laughing, “it’s a damn big fish so we can get a lot of embryo material from one.”

“Why embryo?” Sachs asked.

“It’s the adult central nervous system that doesn’t naturally regenerate,” Rhyme grumbled, impatient with the interruption. “Obviously, a baby’s nervous system has to grow.”

“Exactly. Then, in addition to the decompression surgery and micrografting, we do one more thing—which is what we’re so excited about: We’ve developed some new drugs that we think might have a significant effect on improving regeneration.”

Sachs asked, “Are there risks?”

Rhyme glanced at her, hoping to catch her eye. He knew the risks. He’d made his decision. He didn’t want her interrogating his doctor. But Sachs’s attention was wholly on Dr. Weaver. Rhyme recognized her expression; it was how she examined a crime scene photo.