The roof of the candlemaker's shop on Via Ghibellina gave a sight line across two streets and the back approach to Leonardo's workshop, and Trent crouched on it in the grey January morning and counted guards.
Two on the main road. One at the intersection. A fourth — not a guard, a man watching from a doorway with the specific studied casualness of someone paid to stand and look like he wasn't paid to stand and look. City watch informants worked on commission per confirmed sighting. The casual ones were often sharper than the ones in livery because they had more at stake.
[TERRITORY: FLORENCE — HOSTILE WANTED STATUS: EZIO AUDITORE — HIGH PRIORITY SYNCHRONIZATION: FLORENCE — 5% MUSCLE MEMORY ACCESS: 11% — FREERUNNING ROUTES PARTIALLY AVAILABLE RECOMMEND: APPROACH FROM NORTH, AVOID PRIMARY STREETS]
He'd left the horse two miles outside the city at a farmstead that took coin without questions and was accustomed to the practice. Entered through a drainage channel that Ezio's body navigated with a remembered ease that still felt strange — the instinct arriving slightly ahead of conscious thought, the hands finding grip-points before his eyes identified them. Like learning to type. Like letting the muscle do what the mind was still working out.
The channel delivered him to the tannery district, which smelled exactly like a tannery district and required several minutes of breathing through his shirt. From there: three streets, two rooftop crossings, one very quiet drop into the alley behind Leonardo's workshop.
The back door was wooden, old, and answered to a specific knock sequence that Ezio's memory produced like a word learned in childhood — automatic, present before he consciously decided to access it. Three, pause, two.
Shuffling inside. The scrape of a bar lifting.
The door opened on a narrow, angular face with spectacles pushed up onto a high forehead, dark eyes that moved rapidly across Trent's face with the comprehensive speed of a man accustomed to processing visual information faster than most people asked questions.
"Madonna," Leonardo said. "You're alive."
"Mostly," Trent said. "Can I come in."
Leonardo stepped back.
The workshop was everything the rest of Florence wasn't — warm, bright with multiple lamps despite the morning hour, occupied by a productive chaos of canvases and mechanical drawings and half-assembled instruments and jars of pigment and three different experiments in various states of completion on the central bench. It smelled of turpentine and beeswax and the particular sweet-acid combination of fresh charcoal. A half-eaten bowl of porridge sat on the corner of a drafting table, gone cold and forgotten.
Leonardo da Vinci, at twenty-three, had the hands of a sculptor and the eyes of something slightly inhuman in their speed and precision, and he was currently using them both to examine Trent's face with an intensity that was categorically different from polite concern.
"They're saying Giovanni and the boys were hanged for treason," he said. "I've been hearing it since yesterday morning."
"Giovanni is dead. Federico and I got out."
"Federico." A breath. "Petruccio?"
"Safe. All of them." The question of Petruccio's health was more complicated than safe, but that was a conversation for later. "I need your help with something."
Leonardo cleared the central bench with practiced efficiency — sketches stacked, instruments moved to the shelf — and gestured.
Trent unwrapped the Hidden Blade from the cloth he'd packed it in and laid it on the cleared wood.
Leonardo's expression changed.
Not dramatically. A very small shift around the eyes, a slight forward lean of the shoulders — the particular hunger of a craftsman encountering a mechanism he doesn't yet understand. He picked it up before he spoke, turning it over in long fingers, and the examination he gave it was nothing like the one he'd just given Trent's face. The face had taken three seconds. The blade got thirty before he said anything.
"Where did this come from."
"Giovanni's chest. It was already broken when I found it."
"The release mechanism is jammed — here, the tension on the spring is wrong, it's been set too tight and failed under load. And this housing crack—" Leonardo's thumbnail traced the line of it. "—this is old damage. Months, at least." He turned it over again. "The internal mechanism is— this is extraordinary. I've never seen a release assembly with this tolerance. Who made this?"
"I don't know."
"Can I take it apart?"
"That's why I'm here."
Leonardo took it apart.
It took forty minutes, during which he spoke almost continuously — not to Trent, but to the mechanism, narrating what he found the way some people narrate cooking. Trent sat on a stool and watched and ate some of the cold porridge because he'd been awake since before dawn and his body, at seventeen and athletic, required fuel in quantities that still surprised him.
The blade came apart in careful sequence. Spring housing. Release assembly — six components, two of which Leonardo set aside with reverent attention. The bracer itself. The channel the blade tracked in. And at the base of the channel, recessed into the brass in a way that wasn't visible until the assembly was fully disassembled, a thin sheet of the same material inscribed with text too small to read without leaning close.
Leonardo leaned close.
The silence that followed was different from his earlier narration — the active, engaged quiet of someone receiving information rather than producing it.
"This is..." He reached for his spectacles and put them on. "This is a cipher. Multiple layers — I can see at least three encoding systems overlaid." He looked up. "This is not a maker's mark."
[CODEX INTEGRATION — FRAGMENT DETECTED ALTAÏR IBN-LA'AHAD — ASSASSIN GRANDMASTER — APPROXIMATELY 13TH CENTURY MEMORY SEQUENCE RECONSTRUCTION: PARTIAL UNLOCK — ACQUIRING DATA SYSTEM ALERT: ISU-RESONANT TECHNOLOGY DETECTED IN CODEX PAGE INTEGRATION ACCELERATING — 18%...19%...22% WHAT YOU ARE SEEING: FRAGMENTS OF ANOTHER ASSASSIN'S LIFE — NOT YOURS, BUT YOURS TO LEARN FROM]
The text arrived at the edges of Trent's vision in gold and he was simultaneously present in Leonardo's workshop and somewhere else entirely — a desert at high noon, white stone walls, the smell of sand and heat so alien to Florence in January that his body registered it as sensory confusion. A voice, speaking Arabic with the authority of someone who has spent decades earning the right to sound that certain: "Nothing is true. Everything is permitted. These are not words. They are the entire world in two sentences."
Then gone.
He blinked. Leonardo was watching him.
"You went somewhere," Leonardo said.
"Long night." Trent rubbed the back of his neck. "What does it say. The cipher."
Leonardo looked at him for one more second with those rapid, comprehensive eyes that missed very little. Then back at the page.
"It describes a mechanism. An improvement to the blade's release — a modification to the spring tension that would make the deployment nearly silent and significantly faster." He traced the inscribed lines with a fingertip, not touching. "Alongside that: a philosophy. Notes on operating without leaving evidence. On working within systems by understanding them from the outside." A pause. "Whoever wrote this was thinking about more than weapons."
"Can you rebuild the blade with these specifications?"
"Yes." No hesitation. "I'll need three days. The spring housing needs replacing and I'll have to fabricate several components from scratch, but—" He was already reaching for his own paper and charcoal. "Yes. Three days."
Trent watched him sketch. Leonardo at work was a specific category of person — completely absorbed, the world outside the problem becoming temporarily theoretical. He hummed under his breath, a fragment of something without a clear melody, and his hand moved across the paper with the speed of someone transcribing rather than composing.
"You're different," Leonardo said without looking up.
"How."
"Your speech. The way you look at things." A brief upward glance. "Ezio always looked at rooms the way a young man looks at rooms — for exits, yes, but also for who else was in them. You look at rooms the way an engineer looks at them. For load-bearing points." He returned to his sketching. "Grief changes people, I know. This is different from grief."
"It is grief," Trent said. Because it was, in its way. Giovanni's neat handwriting on the documents. The weight of a borrowed father who had trusted a borrowed son. "Just a particular kind."
Leonardo accepted this. Not because he believed it entirely, Trent thought, but because Leonardo was a man who understood that not every question needed to be pressed to conclusion on first acquaintance.
"Three days," Trent confirmed. "I'll return at night. Through the drainage channel."
"You know the channel approach?" A slight frown. "I never told Ezio about the channel."
"I worked it out." He stood and pulled his cloak around him. "Don't tell anyone I was here."
"Who would I tell?" Leonardo gestured at the workshop around him, the organized solitude of a man who spent his days in productive isolation. "I've been talking to my pigments for company. Your visit is an improvement."
Trent moved toward the back door. The workshop was warm at his back and cold ahead — Florence in January, hostile and indifferent.
He opened the door a crack and checked the alley.
Empty. Good.
Nailed to the outside of the door's wooden frame, a handbill printed in the rough block type of a city administration in a hurry. A name across the top in large letters. Below it, a physical description that was accurate in most particulars. Below that, a number.
The reward was fifty florins. Two hundred percent of everything Trent currently had in his pockets.
He pulled the notice off the door, folded it, and tucked it inside his shirt beside the conspiracy documents.
"So they know which face to look for."
He stepped into the alley and moved north toward the rooftops.
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