Chapter 163: One Drop

The chair was oak, with leather straps on the arms that nobody had bothered to take off.

I sat in it anyway.

"Relax, clerk." The thin man in the stained white coat clasped his hands behind his back and rocked on his heels. "It’s only a formality. A tiny prick, a little fuss, and you’ll be back at your ledgers before the lamps go out."

"I don’t do ledgers anymore," I said. "I shelve books."

"How *delightful.*"

Beside him, the two Inspectors looked like they’d rather be anywhere else. The older one, a grey man with a face like a shut door, cleared his throat. "Ground rules, cadets. Somebody killed five people in the east granary two nights ago. We found shadow residue on the door. Whoever it was has shadow in their blood."

"And you want to check all of us?" Solene asked, arms folded.

"All of Cell One. Gareth’s orders." He gestured at the Doctor. "The Doctor brought an instrument."

The Doctor beamed. He opened the black case at his feet, and I saw a rack of glass needles, each thin as a hair, each set into a little brass cup of clear water.

"Gleam-needles," he said, almost lovingly. "A drop of blood goes in the water. Ordinary blood, it blooms red, polite, dull. But shadow blood..." He tilted one needle, and the light slid down it like oil. "Shadow blood goes *black.* Black as a stormy night. Rather like a signature, you see."

I did see. I saw it very well.

*Valerian,* Aurelix said, tiny in my head. *Don’t move.*

"We go in order," the older Inspector said. "You first, Representative."

Solene held out a finger without blinking. The needle pricked. The drop fell. The water went pink, then clear.

"Next."

Mirain went. Her drop was red. Lyra went. Red. Castor, who treated the whole thing like a tooth cleaning, went. Red. Pollux hissed and glared at the needle like she wanted to fight it, then went red too, and then glared at the Doctor for pricking her at all.

"It’s *rude,*" she muttered.

"I apologize profoundly, my dear."

Casper went next.

The Doctor took his hand and turned it over. The thumbprint under Casper’s eye caught the lamp. For a heartbeat, the smile on that thin face did something I didn’t like. It didn’t fade. It *warmed.*

"Ah," the Doctor murmured. "A hunger-mark. How very old-fashioned."

"It’s a rash," Casper said defensively. "I got it in the ruins."

"Of course you did." The Doctor patted his hand. "A harmless superstition from the border villages. Leave it be. It’ll fade on its own."

The older Inspector frowned. "Doctor, if there’s a curse—"

"There’s *no* curse, Inspector." The Doctor turned and smiled at him, and the Inspector shut up so fast I heard his teeth click. "Decorative. Entirely decorative."

Casper’s drop was red. He sagged with relief and whispered to me, "That’s the second time somebody’s stuck me this week. I’m starting to take it personally."

I sat very still, and I felt a cold hand go around my spine.

*He’s lying,* I thought.

*Of course he’s lying,* Aurelix hissed. *He wants it to stay. Valerian, it’s your turn.*

"Clerk," the Doctor said brightly. "If you please."

---

I held out my finger. The needle slid in. A bead of red welled up, and in that bead, hidden under all the ordinary things that blood is, I felt the shadow stir.

It’s not a thing I can switch off. It’s in me the way marrow’s in a bone. It was waiting, black and eager, and the drop was a half-second from touching the water.

*Now,* Aurelix said.

Fire licked up my arm. Not the amber blaze she’d used on Casper, but a tiny, pale, careful flame that ran under my skin and curled itself around the shadow like a hand around a candle. It didn’t burn it. It *sat* on it, like a hen on an egg.

It hurt. A lot. I kept my face blank.

I’d never felt her burn herself on purpose before. She was holding my shadow, and my shadow hated being held. It pushed against the flame like a dog against a gate, and every push cost her something I couldn’t see. Her voice in my head was a thread. *Steady, darling. Steady. I’ve got you.*

The drop fell into the water.

For one long moment, nobody breathed.

The red bloomed. Pink. Then nothing at all, a dull, boring, perfectly ordinary clear.

"Well!" The Doctor clapped his hands. "Clean as a whistle."

The older Inspector exhaled. "That’s all of them. It isn’t anyone here."

"Evidently not." The Doctor was already closing his case, humming. Then he paused. "Oh! One small thing. Clerk, would you mind terribly if I took a second sample? For the control."

"What control?"

"Mine. The instrument needs a baseline. Something sturdy. A clerk’s blood is so *reliable.*"

*Don’t,* Aurelix whispered.

But the Inspectors were watching, and Cell One was watching, and anything but a yes would look like exactly what it was.

"Fine."

The Doctor produced a long glass vial and a longer needle. It went in with a little prick, and he drew the blood slowly, thoroughly, the way a man milks something he’s decided is his. The vial filled dark and thick. He held it up to the lamp and tilted it, and the smile on his face wasn’t a smile anymore. It was a hunger.

He stoppered it, tucked it into his coat, and leaned down close, and for the first time all evening his voice dropped to a murmur nobody else could hear.

"Thank you, Governor."

My whole body went cold.

"Don’t worry," he whispered. "I won’t tell anyone. Not yet. It’s much more fun when it’s a surprise."

He patted my shoulder, bowed to the Inspectors, and walked out of the hall humming.

I sat in the chair with a bead of blood running down my arm, and Aurelix curled around my wrist in tiny gold panic.

*Valerian,* she said. *He knew. He knew the whole time. The test was never for the Ghost.*

*Then what was it for?*

*Your blood,* she said. *He wanted the sample.*

---

"That," Solene said, in the corridor, "was a lot of blood for a control."

"Yeah."

"Gareth doesn’t know him. I asked. The Tribunal didn’t send him." She fell into step beside me, quiet. "That’s five. Don’t ask me which one."

"I wasn’t going to."

"Liar."

Pollux and Castor were arguing behind us about whether the Doctor smelled like vinegar or formaldehyde. "I don’t like him," Pollux announced. "Noted," Castor said. "Statistically, nobody does."

Lyra was holding Casper’s arm like a lifeline. Mirain walked a little apart, hands in her pockets, the vial somewhere against her ribs, and when I glanced at her she was already watching me.

"He took two," she said, so softly that only I heard it. "I counted. One for the needle, one for his coat. He didn’t take two from anybody else."

"Mirain."

"I’m not asking." She tilted her head. "I’m collecting."

She walked ahead, hawk on her shoulder, and left me standing in the cold corridor with a sticky sleeve and the very clear feeling that I’d just been robbed by a man who said thank you.

---

Beneath the Tribunal, below the cells and the cellars and a long iron staircase no one remembered building, a room glowed green.

The Doctor came down it humming.

"Is it done?"

The voice came from the shadows beside the great glass tank. It was calm, deep, and amused. The man who owned it stood with his hands clasped, tall, handsome in a way that hurt to look at, in a long black coat. His eyes were the color of a drowned moon. Xul’Gorgoth, Ninth of the Demon Lords, wore a human skin the way other men wore a good coat.

"Of course, my Lord." The Doctor produced the vial and held it up like a prize. "The Seventh. Fresh, unaltered, and *delightfully* potent."

"Excellent," Xul’Gorgoth said. "And the boy?"

"Hasn’t the faintest idea."

"Good. Let him keep his little mask a while longer. It will hurt more when it comes off."

In the tank, a girl floated in green fluid, curled like a seed.

She was perhaps fourteen. Pale hair drifted around her face. Her chest was open, a neat, wide hollow, and in the hollow something black and enormous beat, slow as a church bell. A heart that had once belonged to the Eighth Demon Lord, and had been cut from his ribs by the friend who stood watching her now. Xul’Gorgoth had killed him. He had wept a little afterward, and then he’d put the heart on ice.

The Doctor broke the seal on the vial and let a single drop fall into the tank.

It spread through the green like ink through water. Red threads wound around the black heart, around her ribs, around the pale cage of her chest.

The heart skipped.

The girl’s eyelids fluttered.

"Does it take?" the Lord murmured.

"Like a seed in spring, my Lord," the Doctor breathed.

The girl’s lips moved. Bubbles slid up. Her eyes opened, pale and silver, unfocused, empty as a new sky.

"...Warm," she whispered.

Somewhere above them, in a cold stone hall, a boy with a sticky sleeve had just given a demon lord’s weapon its first taste of him.