Cross had been building his case the way he built everything: quietly, methodically, without telling anyone until he was ready.
He spread the printouts across Zara's desk in the closet-office, covering the surface in a grid of access logs, design change orders, and firmware modification timestamps. Each document was annotated in his neat, blocky handwriting, the penmanship of a military man who'd learned early that sloppy notes got people killed.
"Construction phase access logs for the navigation firmware repository," he said. "Thirty-seven entries between Month 9 and Month 14 of the build. All authenticated with Tier 1 design credentials. Tier 1 means the system architect. There were two people with Tier 1 access to the navigation firmware during construction: Dr. Elena Vance and the firmware lead, a man named Park Sung-ho who died in a construction accident in Month 11."
"Convenient accident?"
"I'm looking into it. But that's a separate thread. After Park's death, only one person had Tier 1 access. Every firmware change from Month 11 onward was made by Vance or wasn't logged at all." Cross pointed to a cluster of entries highlighted in yellow. "These seven modifications occurred between Month 12 and Month 14. They don't correspond to any approved design change orders. They were made directly to the firmware without going through the review process."
"The secondary failsafe."
"Almost certainly. The code that Santos's diagnostic triggered, the failsafe that caused the microsurge that pushed navigation past seventy percent. It was planted during these seven sessions. The timestamps are consistent with someone adding code in small increments, testing each addition, and cleaning up the change logs afterward. The cleanup was good but not perfect. She deleted the change descriptions but didn't alter the authentication timestamps."
Zara picked up one of the printouts. A firmware modification log showing a ninety-minute session at 0300 on a Tuesday in Month 13 of construction. Tier 1 credentials. No change description. A ghost edit in the middle of the night by the only person who could have made it.
"Is this enough for charges?"
Cross sat back. His expression was the one she'd learned to read as the professional version of *not yet*. "Under the charter, formal charges require either direct evidence of the act or testimony from a credible witness corroborating the accused's involvement. What I have is circumstantial. Strong circumstantial. I can place Vance in the firmware repository during the window when the failsafe was planted. I can show that she was the only person with the access to do it. I can point to the Larsen letter, the 'not mine' slip during your confrontation, the design-level knowledge required to build the mesh network. But a good advocate would argue that correlation isn't causation. That Vance made legitimate modifications that coincidentally overlap with the sabotage window."
"Nobody believes that."
"The charter doesn't run on what people believe. It runs on evidence standards. And the evidence I need is in Vance's personal files."
"Which are encrypted."
"Design-level encryption. The same Tier 1 access that authenticated her firmware changes. The encryption protocol was written by Vance herself during the construction phase. It's her personal variant of the ship's standard encryption. Nobody on this ship can break it. I've had my best cryptanalysis person working on it for two weeks. He gives it six months to a year, assuming he doesn't make a mistake that locks the files permanently."
The closet-office was quiet except for the conduit. Zara looked at the grid of evidence on her desk. Enough to know. Not enough to prove.
"You have a proposal," she said.
Cross leaned forward. "The navigation rebuild. Santos needs six months. The rebuild requires reconstructing the firmware from backup fragments and rewriting the code that was destroyed in the cascade. Santos is a hardware engineer. He can rebuild the physical components. The firmware is a different problem. The person best qualified to rewrite navigation firmware is the person who wrote it in the first place."
"Vance."
"Vance. She designed the navigation system. She knows the architecture, the backup structures, the firmware dependencies. She could cut Santos's rebuild time in half. Maybe more."
"She's the person who destroyed the navigation system."
"Yes. And she's also the only person on this ship who fully understands how it works." Cross folded his hands on the desk, over the printouts, the evidence of a woman's eleven-year campaign to sabotage the ship she'd built. "Captain, I want to offer Vance involvement in the navigation rebuild in exchange for voluntary access to her personal files. Frame it as a cooperation agreement. She helps with the rebuild, she demonstrates good faith, and as part of that good faith she provides decrypted access to her project files so we can verify that no additional sabotage exists in the systems she designed."
"She'll know it's a trap."
"She'll know it's a negotiation. Vance is many things. Stupid isn't one of them. She'll understand that we're building a case. She'll also understand that her personal files contain evidence that could either convict or exonerate her, and that refusing to decrypt them looks worse than whatever's inside."
"Or she refuses and we have nothing."
"We have what we have now. The circumstantial case. Which I continue building while the cryptanalysis continues running. Nothing is lost by asking." Cross met her gaze. "The ship needs her brain more than it needs our anger, Captain. Three months of navigation firmware rebuilt from scratch versus six. Pharmaceutical synthesis requires modified environmental controls that Vance designed. The agricultural ring's rotation calibration uses algorithms she wrote. She is woven into every system on this ship because she built every system on this ship."
Zara stared at the printouts. The 0300 firmware edit. The missing change descriptions. The Tier 1 credentials that belonged to a woman who walked the corridors of the ship she'd designed to fail.
"Draft the cooperation agreement. I'll review it before you approach her."
---
Research Lab 7 on Deck 4 had been a materials science laboratory before the cascade. After the cascade it had been a storage room for damaged equipment that nobody had time to repair. Now Victor was turning it into a pharmacy.
Sharma directed the conversion with the energy of a woman who'd been told she couldn't help forty-seven people and had decided to change the math. She'd drawn up the specifications on ship stationery during her off-shift and presented them to Victor at 0600, which was when Victor started his rounds and also when Sharma started hers, because neither of them had adjusted to the idea that shifts had endings.
"The synthesis rig goes here," Sharma said, pointing to the corner where a spectral analyzer had been bolted to the floor. The analyzer was gone now, unbolted by Santos's engineers and moved to a corridor outside the lab. "We need a clean environment, which means we seal this section of the lab from the rest and install a HEPA filtration unit from the environmental stores. Santos has the unit. He's allocating it from the Consortium supplies."
Victor watched her work. The young doctor had transformed in the ten days since the cascade, the same way engineers and security officers and navigators had transformed: by finding the thing they could do and doing it until the doing became the only thing that held them together. Sharma's thing was drug synthesis. Her neurology residency in Mumbai had included a rotation in the hospital pharmacy, which meant she understood both what drugs the patients needed and how those drugs were made.
"The anticonvulsant protocol requires three compounds," she said. "Levetiracetam, valproic acid, and lamotrigine. Levetiracetam is the simplest to synthesize. The precursor chemicals are available in the cargo stores. Valproic acid requires a more complex synthesis pathway but is feasible with the equipment we have. Lamotrigine—" She paused. "Lamotrigine will be difficult. The synthesis requires a specific catalyst that I'm not sure we carry."
"If we cannot synthesize lamotrigine?"
"Then we use the existing supply for the patients who need it most and substitute with increased doses of the other two for everyone else. It's not optimal. But it extends coverage from twelve patients to potentially thirty or more."
Victor nodded. Thirty out of forty-seven. Better than twelve. Not good enough. But better.
Santos arrived at 0800 with two engineers and a cart loaded with the environmental control components. The Consortium logo was stamped on the packaging, small and discreet, the mark of resources that had been sitting in a private warehouse while the ship's medical department rationed painkillers.
"Dr. Okonkwo," Santos said. "The HEPA unit and the clean room sealing materials. My team will install today. The power supply modification requires a separate work order. I can have it done by tomorrow."
"Tomorrow is acceptable. Thank you, Eduardo."
Santos directed his engineers into the lab. He moved differently now, Victor noticed. The engineer who'd spent weeks fighting the saboteur's code and losing people to fires had acquired a new competence in the aftermath. He had resources. The Consortium parts. The warehouse access. He'd voted for the oversight framework, and in return he'd received the tools he needed to rebuild the ship. Whether that was governance or bribery depended on which angle you looked from.
Sharma and the engineers worked through the morning. By noon, the clean room enclosure was framed out and the HEPA unit was mounted. By 1400, the first synthesis rig was being calibrated. Sharma ran test batches with inert compounds, verifying the temperature curves and reaction timing before committing any of the ship's limited precursor chemicals to actual drug production.
Victor watched. His hands were in his coat pockets, the habit he'd developed since the cascade. Hiding the hands that shook. Not from the surgery anymore. From something else. Three days of operating on people who'd been burned and crushed and starved of oxygen, and the hands remembered even when the doctor tried to move forward.
"The first batch of levetiracetam will be ready in forty-eight hours," Sharma said. "I'll need to run quality testing before we administer. Call it seventy-two hours to first patient dose."
"Seventy-two hours." Victor pulled his hands from his pockets. Placed them flat on the lab table. Held them there until they were still. "That is acceptable, Dr. Sharma."
She looked at his hands on the table. Looked at his face. Said nothing about either. Turned back to the synthesis rig.
---
Cross was waiting outside the closet-office when Zara returned from the bridge at 2100. He had his tablet and the look of a man who'd found something while looking for something else.
"The cooperation agreement draft is on your desk," he said. "I've structured it as a conditional arrangement. Vance provides consulting on the navigation rebuild and grants access to her project files for security review. In exchange, she receives partial restoration of her lab access privileges and formal recognition of her cooperation in the ship's records."
"She'll want more than lab access."
"She'll negotiate. That's expected. The starting offer is designed to be refused so the counteroffer lands where I actually want it."
Zara sat down. The agreement was on her tablet, twelve pages of legal language drafted by Cross with input from the charter's judicial provisions. She'd read it in detail later. Right now, Cross was standing in her doorway with the look.
"There's something else."
Cross stepped inside. Closed the door behind him, which he almost never did. The closet-office was small enough that two people with the door closed felt like an interrogation. He kept his voice low anyway.
"I've been running passive monitoring on internal comm traffic since the cascade. Standard security procedure during a crisis period, authorized under the emergency communications provision. Most of the traffic is normal. Personal messages, department communications, the expected volume for a ship in crisis."
"Most."
"Most. There's an anomaly. Vance's lab terminal on Deck 4 has been exchanging data packets with an unregistered terminal somewhere in the lower decks. The packets are small, encrypted, and routed through three intermediate nodes to obscure the origin and destination. The routing is sophisticated. Not something a casual user could set up."
"How long has this been going on?"
"The earliest packet I can identify in the traffic logs is from six days ago. Three days after the cascade. But the routing pattern suggests the communication channel was established earlier and went dormant during the cascade. It reactivated once the primary comm systems were restored."
"Can you trace the unregistered terminal?"
"I've narrowed it to the lower decks, Decks 40 through 50. The intermediate nodes make precise location difficult. The packets bounce through three legitimate terminals before reaching the destination, and the routing changes with each exchange. Whoever set this up knows how to avoid passive monitoring." He paused. "They didn't account for someone checking the packet metadata against the routing tables manually. The encryption hides the content. It doesn't hide the fact that the packets exist."
"Someone is communicating with Vance."
"Someone with access to ship communications infrastructure, the ability to set up an unregistered terminal, and the sophistication to route encrypted traffic through intermediate nodes. That's not a passenger with a grudge. That's someone with technical skills and a reason to stay hidden."
The closet-office was very small. The conduit hummed. Outside the door, the ship moved through space on a heading that was 1.8 degrees off course toward a destination that an alien intelligence had chosen for them.
"The saboteur wasn't acting alone," Zara said.
"The saboteur may have had infrastructure support. The mesh network required physical installation across fifty-six systems. One person could do it over seven months, but it would be significantly easier with help. Particularly for the installations in the lower decks, which are less trafficked and less monitored." Cross tapped his tablet. "I'm continuing passive monitoring. If I pull the terminal now, whoever's on the other end disappears. If I watch the traffic, eventually they make a mistake in the routing, and I find them."
"How long?"
"Days. Weeks. Depends on how often they communicate and how careful they are."
Zara looked at the cooperation agreement on her desk. The plan to bring Vance into the navigation rebuild, to offer her lab access in exchange for her files, to use her expertise while building the case to charge her.
And now a second person. An unregistered terminal in the lower decks. Encrypted traffic. A communication channel that had survived the cascade and reactivated as soon as the comm systems came back online.
"Keep watching," she said. "Don't tell Santos. Don't tell the Council. This stays between us and Wei."
Cross nodded. He reached for the door, then stopped.
"Captain. One more thing. The packet sizes are consistent with text messages, not data transfers. They're talking. Short exchanges, back and forth, the pattern of a conversation." He looked at her. "Whatever Vance is planning next, she isn't planning it alone."
