The silver chalice didn’t just fall; it shrieked against the Istrian marble floor, spray-painting the white stone with a vintage that smelled less of grapes and more of old copper.

  Cesare Borgia was on his knees, his fingers clawing at the throat of his black silk doublet. His eyes, usually the cold gold of a predator, were bloodshot, darting toward the shadows of the Great Hall in Imola as if the tapestries themselves were narrowing their weave to choke him.

  “Niccolò,” he wheezed, his voice a jagged rasp. “The air… it has teeth.”

  I stepped forward, my scholar’s robes feeling heavy, like lead-lined parchment. I didn’t reach for him. To touch a seizing Borgia was to invite a dagger to the ribs once the fit passed. Instead, I looked at the spill. The wine was foaming—a tiny, frantic agitation of bubbles that shouldn’t exist in a dry Roman red.

  “It is not the air, my Prince,” I said, my voice maintaining the clinical detachment I had honed since my arrival in this nest of vipers. “It is the curriculum. You are learning the hardest lesson of power: that its seat is often a stool placed over a trapdoor.”

  Behind us, the heavy oak doors groaned open. Dr. Jean Arnault, the French physician the Pope had sent to ‘preserve’ his son’s health, glided into the room. He didn’t look worried. He looked like a man checking the drying time on a fresco.

  “Move aside, Master Machiavelli,” Arnault murmured, his accent a slick, Parisian oil. “The Duke’s humors are merely… recalibrating.”

  Three hours later, the fortress was silent, save for the rhythmic clank of the armored sentries in the courtyard. I found myself in the physician’s sanctum, a room that smelled of formaldehyde, lavender, and something sharp that made the hair on my arms stand up.

  I didn’t need a key. Piero de’ Medici’s money had bought me the loyalty of the locksmiths weeks ago.

  I ignored the jars of pickled organs. I ignored the astrological charts. I went straight for the ledger—the one bound in human skin that Arnault thought no one could read. But Arnault didn’t know that I had spent my youth deciphering the merchant codes of the Medici banks.

  Politics is just bookkeeping with blood; medicine, I was discovering, was the same.

  The entries were meticulous.

  Oct. 12: 3 grains of Cantarella in the morning broth. Subject shows increased heart rate, heightened sensory perception. Oct. 14: 5 grains. Subject reports shadows moving of their own volition. Success. Paranoia is the ultimate defense.

  “It’s called Inverse Medicine, Niccolò.”

  I didn’t jump. I merely closed the ledger and turned to face Arnault. He stood in the doorway, a mortar and pestle in his hands, looking more like a philosopher than a healer.

  “You are poisoning him,” I said, my voice flat. “The Cantarella—the Pope’s own white powder. You are feeding it to him in increments.”

  Arnault stepped into the light. His eyes were wide, bright with a terrifying, intellectual fervor. “Poisoning? No. I am tempering him. Like a blade. If I give him trace amounts every day, his blood will become so saturated with the Borgia venom that no assassin can ever kill him with a drop in his cup. He will be the first Mithridatic King.”

  “He can’t sleep, Jean,” I countered, stepping toward him. “He sees demons in the curtains. He executed three kitchen boys yesterday because he didn’t like the way they looked at his bread. You aren’t building a king; you’re building a madman.”

  Arnault laughed, a dry, rattling sound. “A Prince who trusts no one is a Prince who cannot be betrayed. Is that not what you teach him? I am merely providing the biological foundation for your philosophy.”

  “I teach him to be feared, not to be a frantic dog,” I snapped. “You are destroying his mind to save his skin. Look at the ledger, Jean. You’ve increased the dosage. The tremors in his hands… he can barely sign a death warrant.”

  “But he does sign them,” Arnault whispered, leaning in. His breath smelled of bitter almonds. “The Pope wants a son who is a weapon. Weapons don’t need peace. They need an edge.”

  I looked at the jars on the shelf behind him. They were labeled with names of the Duke’s inner circle. Michelotto. Lucrezia. Machiavelli.

  “And what is my dosage, Doctor?”

  Arnault smiled, showing teeth like yellowed ivory. “You, Niccolò, are the control group. I need one sane man to record the descent. After all, what is a masterpiece if there is no chronicler to tell the world how it was painted?”

  I left the lab with my heart hammering against my ribs like a trapped bird. I needed to find Cesare. I needed to tell him that his trusted physician was a ‘Doctor Death,’ a man who saw the human soul as an accounting error to be corrected with arsenic.

  I found the Duke in the armory. He was standing in front of a suit of blackened steel armor, talking to it.

  “The Florentines think they can buy time with gold,” Cesare was saying to the empty helmet. “But time is a liquid, isn’t it? It leaks.”

  “My Prince,” I said, keeping my distance.

  Cesare turned. In the torchlight, his skin looked translucent, like fine parchment stretched too tight over a skull. He looked older than his years—ancient, preserved, and utterly hollow.

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  He grabbed my arm. His grip was a vice, but his hand was shaking with a high-frequency vibration that felt like a hive of bees.

  “Niccolò,” he hissed. “Arnault gave me a new tincture. He says it will make me see the future. Do you know what I saw?”

  “I can guess, Cesare.”

  “I saw myself sitting on a throne of salt,” he whispered, his eyes wide and unfocused. “And the sea was rising. But I didn’t drown. I just… sat there.”

  I looked at him—this man I was supposed to ‘tame’ for the Republic of Florence. I thought of the salted meats the sailors took on long voyages to the New World. They lasted forever, but they were no longer truly meat. They were just salt and memory.

  “The Prince is being preserved like a piece of salted meat,” I murmured to myself, the dark humor of the thought tasting like ash.

  “What was that?” Cesare’s grip tightened. His paranoia flared, a physical heat radiating from him. “Are you mocking me? Are you with the Medici? I can smell the bank on you, Niccolò. I can smell the ink and the gold.”

  “I am observing, My Prince,” I said, my mind racing. “I am observing that you are reaching a state of… absolute purity. But even a blade can be over-sharpened until the edge snaps.”

  “Arnault says I am becoming a god.”

  “Arnault is an alchemist of the grave,” I said, taking a calculated risk. “He is using the Pope’s Cantarella to build your tolerance, but he is balancing the ledger with your sanity. Look at your hands, Cesare.”

  Cesare looked down at his trembling fingers. A look of genuine, child-like terror crossed his face for a fleeting second before the mask of the monster slammed back down.

  “He wouldn’t,” Cesare whispered. “My father sent him.”

  “Exactly,” I said. “The Pope wants a son he can use, but perhaps he also wants a son he can stop if he becomes too ambitious. A man who cannot sleep cannot plot. A man who suspects everyone cannot build a dynasty.”

  Cesare lunged, pinning me against a rack of pikes. The cold steel of his dagger pressed against the soft skin beneath my jaw.

  “If you are lying, I will have Arnault dissect you while you still have the breath to scream,” Cesare growled.

  “And if I am right,” I gasped, the point of the blade drawing a single, hot bead of blood, “you are already a dead man walking. You are just waiting for the salt to finish the cure.”

  The Duke stared at me, the madness and the brilliance warring in his gaze. For a moment, I saw the man he could have been—the Great Unifier of Italy. Then, a shudder racked his body, and the predator returned.

  He pulled the knife back, but he didn’t let me go.

  “We shall test it,” Cesare said, a terrible smile spreading across his face. “Tonight is the feast for the envoys of Forlì. Arnault prepares my wine personally.”

  He leaned in, his voice a ghost’s whisper.

  “You will drink from my cup first, Niccolò. If it is ‘medicine,’ you will be stronger. If it is ‘death’…”

  He leaned even closer, the smell of the copper wine-breath filling my lungs.

  “…then you will be the first entry in my new ledger.”

  The Great Hall was a sea of velvet and false smiles. The envoys from Forlì sat opposite us, their eyes darting nervously toward the Duke, who sat at the head of the table like a marble statue.

  Dr. Arnault stood behind the Duke, holding a decanter of deep, dark violet glass.

  I sat at Cesare’s right hand. My plate was untouched. My throat was so dry I feared I wouldn’t be able to swallow even if I wanted to.

  Cesare signaled. Arnault stepped forward, his movements fluid and precise. He poured a stream of dark wine into Cesare’s silver chalice. The liquid seemed to absorb the candlelight rather than reflect it.

  “To the health of the Duke,” Arnault said, his voice a silky caress.

  Cesare didn’t pick up the cup. He looked at me. The challenge in his eyes was a death sentence.

  “Niccolò,” Cesare said, his voice echoing in the sudden silence of the hall. “My dear friend. My mentor. I am feeling… uncharacteristically generous. I wish for you to share in my vitality. Drink.”

  I looked at the cup. I looked at Arnault. The doctor’s face was a mask of professional neutrality, but his eyes… his eyes were fixed on the chalice with a hunger that confirmed every word of that skin-bound ledger.

  I reached out. My fingers touched the cold silver.

  I thought of my parents in Florence, held hostage by the Signoria. I thought of Piero de’ Medici’s secret gold. I thought of the book I was writing—the one that would tell the truth about how power really works.

  I lifted the chalice. The scent hit me—sweet, cloying, with a metallic undertone that screamed of the grave.

  I looked at Arnault. I looked at Cesare.

  “To the Prince,” I whispered. “May he get exactly what he deserves.”

  I tilted the cup. The liquid hit my tongue—bitter, electric, and cold.

  As I swallowed, my vision didn’t blur. It sharpened. The colors of the room became violent. The sound of a fork hitting a plate sounded like a cannon shot. My heart began to drum a frantic, irregular rhythm against my ribs.

  I put the cup down. Cesare watched me, his breath hitched in his chest.

  Ten seconds. Twenty.

  I felt a surge of terrifying, artificial strength. I felt like I could tear the stone walls down with my bare hands. But beneath the strength, a dark curtain was beginning to fall over the corners of my mind. The paranoia—the Borgia sickness—was an invited guest, and it was bringing its own luggage.

  “Well?” Cesare demanded.

  I opened my mouth to speak, but my tongue felt like a thick, dry sponge. I looked at Dr. Arnault. He was smiling now. A small, satisfied smile.

  “It is… potent,” I managed to choke out.

  Suddenly, a commotion erupted at the back of the hall. A messenger, caked in the dust of the Romagna roads, burst through the doors. He fell to his knees, gasping for air.

  “My Lord!” he cried. “The Pope… His Holiness…”

  Cesare stood up, the chair screeching back. “Speak, you dog!”

  “The Pope has sent word! A new physician is coming from Paris. Dr. Arnault is to be recalled to Rome immediately for… questioning.”

  I turned to look at Arnault. The doctor’s face had gone the color of ash.

  But it wasn’t the messenger that stopped my heart. It was the feeling in my own limbs. The ‘strength’ was turning into a sickening, liquid heat. My skin felt like it was melting.

  I looked at my hand on the table. It was shaking.

  Not with fear. But with the same high-frequency vibration I had felt in Cesare.

  “The dosage,” I whispered, the words barely audible over the roaring in my ears. “Arnault… you didn’t recall the dosage for the control group.”

  Arnault didn’t answer. He was already backing toward the shadows.

  But Cesare was faster. The Duke leaped across the table, his movements a blur of chemically-enhanced speed. He didn’t use a dagger. He used his bare hands, catching Arnault by the throat.

  “Recall?” Cesare screamed, his voice breaking into a high, hysterical pitch. “No one leaves my service without my signature!”

  As Cesare began to squeeze, my world started to tilt. I reached for the edge of the table, but my fingers felt like they belonged to someone else.

  I saw Arnault’s eyes bulge. I saw Cesare’s face—a mask of pure, unadulterated madness, beautiful and terrifying.

  And then, I saw the messenger. He wasn’t looking at the Duke. He was looking at me.

  He moved closer, leaning over my shoulder as I slumped forward. He didn’t smell like the road. He smelled like the Medici banks—wax and old coins.

  “Piero sends his regards,” the messenger whispered into my ear. “He says the interest on your debt is due. And he wants the ledger, Niccolò. All of them.”

  My head hit the marble. The last thing I heard was the sound of Cesare Borgia laughing—a sound that was more salt than man.

  Niccolò is poisoned and collapsing while a Medici agent moves in to steal the evidence of the Borgia’s “Inverse Medicine.” Cesare has fully spiraled into a murderous, chemically-induced rage.