The assistant hit a button on a keypad. The victim twitched and coughed blood—some of it still his own, dark and clotted. The wave traces spiked, then became smoother, more periodic.

Lukowski took the victim's hand and squeezed it—a gesture which struck me as cynical, although for all I knew it might have reflected a genuine compassionate impulse. I glanced at the bioethicist. His T-shirt now read CREDIBILITY IS A COMMODITY. I couldn't decide if that was a sponsored message or a personal opinion.

Lukowski said, "Daniel? Danny? Can you hear me?" There was no obvious physical response, but the brain waves danced. Daniel Cavolini was a music student, nineteen years old. He'd been found around eleven, bleeding and unconscious, in a corner of the Town Hall railway station—with watch, notepad, and shoes still on him, unlikely in a random mugging gone wrong. I'd been hanging out with the homicide squad for a fortnight, waiting for something like this. Warrants for revival were issued only if the evidence favored the victim being able to name the assailant; there was little prospect of obtaining a usable verbal description of a stranger, let alone an identikit of the killer's face. Lukowski had woken a magistrate just after midnight, the minute the prognosis was clear.

Cavolini's skin was turning a strange shade of crimson, as more and more revived cells began taking up oxygen. The alien-hued transporter molecule in the ersatz blood was more efficient than hemoglobin—but like all the other revival drugs, it was ultimately toxic.

The pathologist's assistant hit some more keys. Cavolini twitched and coughed again. It was a delicate balancing act; small shocks to the brain were necessary to restore the major coherent rhythms… but too much external interference could wipe out the remnants of short-term memory. Even after legal death, neurons could remain active deep in the brain, keeping the symbolic firing-pattern representations of recent memories circulating for several minutes. Revival could temporarily restore the neural infrastructure needed to extract those traces, but if they'd already died away completely—or been swamped by the efforts to recover them—interrogation was pointless.