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He passed her the siphon. She took it and uncapped the needle end. One drop onto the slide beside the milky solution. The blood hit the reagent and the slide fizzed the same wrong way as before.

She placed it under the scope. Marcus stood at her shoulder. The cells swam into view. The sodium thiosulfate had done the same thing. Temporary arrest held at the edges and relapse crept in from the center, thirty seconds of perfect followed by the same creeping dark.

Marcus made the note. Sodium thiosulfate, seven grams. Distilled water, two milliliters. Result: temporary arrest, thirty seconds, full relapse.

Del set the slide aside and reached for the next vial, the next weight, the next measure. Marcus capped the siphon and prepared the next draw. Denny Alcott’s file stayed open on the table between them, stable and weekly and four days old.

The lamp burned. The shadows reached. They worked.

Chapter 8

The seventeenth test used copper filings and distilled vinegar. Del measured the copper on the brass scale while Marcus drew another sample from his own arm. The lamp guttered. Outside, the wind had died. The clinic held the smell of sixteen failures and the wrongness that rose from the infected blood when the jar was uncorked.

Marcus capped the siphon and set it on the steel tray. His left arm bore a line of punctures from the crook to the wrist, each one sealed with a dot of pressure and his own accelerated healing. The punctures would close by morning. The memory of Denny Alcott’s file wouldn’t.

Del tipped the copper filings into the mortar. The metal caught the lamplight, minute and gleaming. She added two milliliters of vinegar and worked the pestle in slow circles. Her sleeve was pushed past her elbow. Her forearm was smudged with reagent stains that had dried and been wiped and dried again. She didn’t look up when the side door opened.

The woman stepped through without knocking. The door swung shut behind her. She was tall, athletic, with black hair that fell past her shoulders and dark eyes that moved across the clinic in a single sweep. A scar ran across her ribs beneath her jacket, pale against her skin. She stood with her weight balanced and her hands loose at her sides. She didn’t fidget.

Marcus straightened. He hadn’t heard her approach. The gravel outside made noise. She hadn’t made noise.

“You’re working late.” Her voice was dry and matter-of-fact.

Del’s hand stopped on the pestle. She looked up. The woman’s eyes found hers and held.

“I’ve been sent to deliver a message,” the woman said. “Arrow wants you to stop.”

The name hung in the clinic. Marcus felt it land. Del’s fingers tightened on the pestle. The stone made a low grinding sound against the mortar.

“Stop what,” Marcus said.

“The counteragent work. The blood draws. The tests.” The woman’s gaze shifted to the logbook open on the table. To the line of ruined slides. To Denny Alcott’s file. “All of it.”

Marcus took one step between the woman and the worktable, and his body blocked her view of Del. His right hand rested at his side, near the instrument case.

“Who sent you,” he said.

“Arrow.”

“Full name.”

The woman’s mouth curved in something less than a smile. “He doesn’t use one with me.”

Del reached for a vial on the shelf behind her. The glass was warm from the lamp. She gripped it in her left hand and held it at her side. The contents had been heated earlier. The liquid inside was amber and viscous.

“You’re wasting time,” the woman said. “The compound is stable. The degradation is irreversible. You’ve run sixteen tests. None of them worked.”

Marcus’s jaw tightened. “You’ve been watching.”

“I’ve been informed.”

“By who.”

“Arrow.”

The name came a third time. Each repetition carried less weight and more certainty. The woman said it without emphasis, without drama, with the flat delivery of a lab result. Marcus recognized the tone. He had used it himself ten thousand times across an exam table. This is what I see. This is what it means.

“You can leave,” Marcus said. “We’re not stopping.”