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He reached for the lamp and tilted the base. The oil was low. He uncapped the reservoir and poured from the jug he kept under the sink. The fresh oil caught the flame and the light brightened, throwing their shadows sharp against the stone wall. Del’s shadow reached the cold-storage box. Marcus’s reached the door.

Leaving never came up. The question had stopped mattering around the fifth failed test.

Del tore the page from her notes. The paper came free with a sound that cut the quiet. She smoothed it flat on the table and drew a fresh column. Component, weight, solvent, result. Her pen moved down the page. She wrote magnetite and crossed it out. She wrote sodium thiosulfate and put a question mark beside it.

The tenth test used lemon balm extract and white vinegar in a ratio she’d never tried. Three parts lemon balm to one part vinegar. She mixed it in a clean vial and added a drop of Marcus’s blood. The sample turned amber, then clear, then something else entirely, something that wasn’t liquid anymore.

The blood crystallized. The entire slide went solid, the cells frozen in amber resin, the degradation pattern preserved like insects in sap. Del stared at it. The crystallization was perfect, each cell suspended and each membrane caught mid-dissolution. She could count the threads of hemoglobin leaching into the plasma. She could see exactly how it killed.

She scraped the slide clean with a metal spatula. The crystallized blood came off in one piece, brittle and amber. She dropped it into the trash and reached for the next slide.

The eleventh test used witch hazel and copper sulfate. The slide foamed and went black.

The twelfth test used valerian root (the same component she’d ground for two years) and silver nitrate in reverse proportion. The slide produced a silver sheen that coated the healthy cells and accelerated the degradation in the sick ones.

The thirteenth test used nothing. Del placed a drop of Marcus’s blood on a clean slide and let it sit under the scope. The degradation continued at its own pace, steady and patient, the same pace it had held in every wolf who’d come through the door.

By the fourteenth test, her notes were illegible. Cross-outs overlapped cross-outs. Numbers had been written and rewritten until the paper tore. Marcus’s logbook entries had grown shorter. Sodium thiosulfate, five grams. No change. Lemon balm extract, three parts: it crystallized. Witch hazel, copper sulfate: it turned black.

The fifteenth test was the one that broke her.

She set down her pen. The barrel was warm from her grip. She pressed both palms flat on the steel tabletop and stared at the ruined slide. It was number fifteen, ash and magnetite and sodium thiosulfate in a combination that should have worked. The slide showed the same border and the same cells coming apart, the same thing she’d seen fifteen times in fifteen different failures.

Marcus stood at her shoulder. He hadn’t moved away after reading the result. His breathing was even. His hand rested on the table near hers without touching it. The lamp burned between them. The shadows of the reagent bottles reached the ceiling.

Del’s palms were flat on the steel. Marcus’s hand was near hers. The clinic held the smell of fifteen failures and the lamp that kept burning.

The knock came hard against the side door. Three strikes, fast, the kind that didn’t wait for an answer. Marcus straightened. His hand left the table. He crossed the clinic in four strides and pulled the door open.

Cold air pushed into the room. A young man stood on the gravel, his breath white in the dark. He wore a pack jacket zipped to his throat. His boots were muddy. He was breathing hard, like he’d run the whole way.

“Marcus.” His voice was rough. “Denny Alcott is dead.”

The words sat in the room. Del stayed at the worktable. Her hands were still flat on the steel. The fifteenth slide sat ruined under the lamp.

“Fever spiked around nine,” the runner said. “His mate called Gabriel. They got there in twenty minutes. He was already gone.” The runner’s jaw worked. “Gabriel says to tell you. That’s all.”

Marcus nodded. The runner turned and left. The gravel crunched under his boots, then faded. Marcus closed the door. The latch clicked.

Del picked up the pen. The barrel was warm from her grip. She held it without writing anything. Her knuckles went white around the plastic. The pen had a cap. She hadn’t put it on. The point faced down toward the paper she’d torn and smoothed.

Marcus crossed to the filing cabinet beside the cold storage box. The drawer slid open with a metal sound. He pulled a manila folder from the second row and brought it back to the worktable. He opened it beside the ruined slides.

The file belonged to Denny Alcott, thirty-four, a shifter with weekly blood draws since February. It was thin, three pages. The last entry was dated four days ago. Marcus’s handwriting filled the margin: pulse 72, temp 98.6, blood count within normal parameters. Below that, two lines. Stable. Monitor weekly.

The date was four days ago. Denny Alcott was dead tonight.

Del set the pen down flat. The point touched the paper but didn’t mark it. She didn’t apologize. They’d moved past that around the third failed test, when apologies became what they were: words that changed nothing about the blood in the vials or the cells under the scope or the fact that she had ground the base for two years knowing the ratios were wrong.

She pulled the brass scale closer. The weights sat in their tray, cool and brass. She selected the seven-gram weight and set it on the right pan. The left pan was empty. She reached for the sodium thiosulfate jar and uncapped it. The powder was white and fine. She poured until the scale balanced. Seven grams exactly.

Marcus capped the siphon. He’d left it uncapped on the table after the fifteenth test. The glass barrel held a dark crescent of his blood at the bottom. He set the capped siphon beside the scale and reached for a fresh slide.

The clinic held the three of them now: Del at the scale, Marcus with the slide, and Denny Alcott’s file open between them. The last entry faced up. Stable. Monitor weekly. The date was four days old. The man was dead.

Del measured the distilled water. Two milliliters. She added it to the sodium thiosulfate in a clean vial. The mixture turned milky. She set the vial on the steel tabletop and reached for the grease pencil.

Marcus drew the fresh sample. The needle went into the crook of his left arm. He depressed the plunger. The blood filled the glass barrel dark and fast, vampire blood, his own, for the sixteenth test.