"Captain. Contact. Single vessel. Six hours behind us and closing."
Aria-7's voice broke through the ship like a cold draft. Kira was in the command space reviewing the Hollow King's communication data with Voss when the words hit, and every calculation she'd been running about containment parameters and dimensional frequencies dropped into the background like stones into water.
"Classification," she said.
"Interceptor-class. Imperial configuration. Drive signature matches the ISV *Mandate*."
Cross was at the tactical console before Kira finished processing the sentence. The admiral's hands moved over the display with the speed of thirty years of fleet operations, pulling up the sensor data, parsing it, confirming what Aria-7 had already said.
"Kaine," Cross said.
"How?" Jax asked. He was at the command space entrance, where he'd been standing for the last hour while Sable slept on the operations cot. "The convergence zones should have stopped any Imperial vessel from following us. They can't navigate the turbulence without a Progenitor interface."
"They do not need to." Cross was staring at the sensor data, and the expression on her face was the particular fury of a teacher watching a student use her own lesson against her. "The convergence zones are areas of dimensional turbulence caused by colliding currents. When a vessel passes through a convergence zone, it displaces the turbulence temporarily. Creates a calm corridor in its wake. The corridor persists for a limited time before the currents reassert themselves."
"He followed our wake," Kira said.
"He waited at the Expanse boundary. Watched us enter. Tracked our path on long-range sensors. Then he flew into the corridor we carved through the first convergence zone before it closed." Cross's voice was tight. "He does not need to navigate the turbulence. He flies through the calm water we leave behind."
"How long do the corridors persist?"
"Depending on current intensity, eight to twelve hours. He entered within that window. He has been following our exact path through every convergence zone we have navigated."
Kira looked at the sensor display. The *Mandate*'s drive signature, a single point of light in the Expanse's dimensional chaos, tracking along the same route the warship had taken. Following them like a bloodhound on a scent trail.
"You taught him this," Kira said to Cross. Not an accusation. A fact.
"I taught him pathfinder tactics. Using an advance force to clear a route through hostile territory for the main body. It is standard fleet doctrine for uncharted space." Cross's jaw was rigid. "I did not anticipate he would apply it to the Shattered Expanse using our ship as the advance force."
"Speed comparison," Kira said.
"The *Mandate* is an interceptor-class vessel," Aria-7 said. "In normal space, its maximum speed exceeds ours by approximately forty percent. In the Expanse's dimensional environment, both vessels are slowed by the ambient currents. However, the *Mandate* is smaller, lighter, and operating in our cleared corridors rather than in active turbulence. Its effective speed advantage in the Expanse is approximately fifteen percent."
"He's gaining."
"At the current rate, the *Mandate* will reach engagement range in approximately four hours. We will reach the Void Throne's location in approximately six hours."
Two hours short. Kaine would catch them before they reached the seal.
---
The crew gathered fast. Not the formal assembly of the previous meetings. This was combat preparation, positions taken by instinct, everyone moving to where they needed to be. Corvin to the sub-chamber. Malik to the weapons bay. Zeph to engineering. Cross and Drayden at tactical. Jax beside Kira.
Sable woke when the ship's ambient tone shifted. The bio-tissue changed color, the pale gold of the Hollow King's communication giving way to a darker shade, bronze deepening toward something that looked like banked fire. The ship knew it was being hunted.
"Options," Kira said.
Cross pulled up the tactical display. The Expanse mapped in real-time sensor data, their position, Kaine's position, the path between them, the route ahead to the seal. "We cannot outrun him. We cannot hide in the Expanse. The dimensional environment provides no cover. The currents are transparent to sensors. He can track us as easily as we can track him."
"Can we collapse the corridor behind us?" Jax asked. "Seal the wake, force him to navigate the turbulence himself?"
"The corridors are a natural consequence of our passage. We would need to artificially destabilize the currents in our wake, which would require diverting significant power from the drive to the ship's dimensional manipulation systems."
"How much power?" Corvin's voice from the sub-chamber comm.
"Aria-7 estimates twenty to thirty percent of pillar output."
"That drops us to fifty-three percent. The ship's drive needs sixty-five minimum to maintain safe speed in the Expanse currents. Below that, we're at the mercy of the dimensional environment."
"Scratch that option," Kira said.
"Weapons," Malik said from the weapons bay. "I have the dimensional lance batteries calibrated for void-native organisms. Biological targets in a dimensional medium. Kaine's ship is a military vessel with Imperial shielding. Different target profile. I need to recalibrate."
"How long?"
"Full recalibration for anti-ship configuration: two hours. Partial recalibration for something that'll dent Imperial shields: forty minutes."
"Start the partial. Now."
"Already on it, Captain."
Kira looked at Cross. "Kaine's ship. Tell me about it."
"The ISV *Mandate*. Interceptor-class. I assigned it to him personally two years before my defection." Cross pulled up the ship's profile from her data tablets. "Fast, well-armed for its size, light on armor. It is designed for pursuit and engagement, not prolonged combat. Standard Imperial shielding on all aspects. Quantum mesh targeting. Crew of forty-two."
"Weaknesses."
Cross shook her head. "I trained Kaine to eliminate weaknesses."
"Everyone has weaknesses," Drayden said.
The frigate captain was standing at the edge of the tactical console. He'd been quiet during the previous meetings, doing his tactical planning work with Cross, staying out of the larger conversations about weapons and entities and dying universes. But this was his territory. Ship-to-ship. Imperial tactics. The thing he'd spent his career doing.
"I served under Kaine for two years on the *Argent Dawn*," Drayden said. His cracked ribs made him stand crooked, favoring his left side, but his voice was steady. "He transferred to the *Mandate* after the Dawn was decommissioned. I know the ship's systems because I helped run the shakedown drills."
"Weaknesses," Kira repeated.
"The *Mandate*'s shield architecture is standard Imperial: distributed generator network, overlapping fields, full coverage at standard speed. But the interceptor-class hull is narrow. The generators are packed tight. At full speed in unstable dimensional environments, the aft generators have to compensate for drive wake interference. The shield field at the stern thins by eight to twelve percent when the ship is running at maximum thrust in an environment with ambient dimensional turbulence."
"Eight percent," Jax said. "That's not much."
"Eight percent against standard weapons. The dimensional lance doesn't operate on the same frequency spectrum as Imperial shields. If we can hit the aft section when the shield field is thin and Malik's recalibration accounts for the frequency mismatch, a concentrated lance strike could breach."
"But that means letting him get close," Kira said.
"Close enough to hit us first. The *Mandate*'s forward weapons are strong. That's the interceptor design: heavy forward armament, light aft. It's a pursuit ship. Built to chase things down and kill them from behind. If Kaine catches us, he'll position off our stern and hammer us while his bow shields take anything we throw back."
"So we need him to turn around," Malik said on the comm.
"We need him to present his aft section," Drayden corrected. "Either by turning around or by passing us. If he passes us, even for a moment, his thin shields face our lance batteries."
"Kaine won't pass us voluntarily," Cross said. "He is not careless. He will approach from astern, match speed, and engage at range. He will never present his vulnerable aspect unless we force him to."
The command space was quiet for three seconds. The Expanse currents flowing past the hull. Kaine closing at fifteen percent speed advantage. Four hours. Six to the seal.
"The convergence zones," Kira said.
Everyone looked at her.
"Aria-7. The next convergence zone on our projected route. Where is it?"
"Approximately ninety minutes ahead, Captain. A major convergence. Three dimensional currents intersecting. My preliminary analysis suggests it will be the most severe we have encountered."
"And after we pass through it, our wake creates a calm corridor."
"Correct. Duration of the corridor will vary depending on the severity of the convergence, but I estimate eight to ten hours based on current patterns."
"Kaine is following our corridors. He expects us to carve a clean path through every convergence zone, and he follows it." Kira looked at the sensor display. At the *Mandate*'s position. At the convergence zone ahead. "What if the corridor isn't clean?"
Cross's expression changed. The anger shifting to something sharper. "You want to sabotage our own wake."
"I want to set a trap. We go through the convergence zone. Normal navigation, combat interface, the standard path. But instead of flying straight through and leaving a clean corridor, we make the corridor unstable. Navigate a path that's barely passable, close to the turbulence walls, so that the wake we leave is narrow and rough. Then we park on the other side and wait."
"Kaine enters the corridor expecting smooth transit," Drayden said, picking it up. "Instead the corridor is narrow and turbulent. His ship is bouncing off the walls of our wake. His drive at full power to keep up. His aft shields thinning in the dimensional turbulence."
"And we're on the other side with the lance batteries pointed at the exit," Malik said.
"He comes out of the corridor with his drive hot and his stern exposed," Kira said. "And we hit him before he can reposition."
Cross was quiet. Thinking. Running the tactical math that thirty years of fleet command had burned into her brain. "It could work. The corridor exit is a choke point. He will emerge at speed, committed to his course, with limited maneuvering room. If the lance batteries are calibrated and targeting his aft section, we have a window of four to six seconds before he can adjust his shields."
"Four to six seconds," Malik said. "I can work with that."
"The problem," Cross said, "is the navigation. Creating a rough corridor means you cannot fly the optimal path through the convergence zone. You must deliberately navigate close to the turbulence, graze the dangerous zones, take a longer and more costly route. The combat interface expenditure will be higher."
Kira knew. The math was simple and terrible. Two minutes and forty-eight seconds of combat capacity. The convergence zone ahead was the worst they'd faced. A clean navigation might cost twenty-five seconds. A rough, deliberately dangerous path designed to leave an unstable wake could cost forty. Fifty. More.
She couldn't afford fifty seconds. She couldn't afford forty. Every second of combat interface she spent on this trap was a second she didn't have for the inner Expanse, for the remaining convergence zones, for whatever waited at the seal.
But she also couldn't afford Kaine on her stern for the next four hours, hammering the ship while they tried to reach the Throne.
"How much combat interface will it cost?" Jax asked. He was the only one who didn't know Kira's exact capacity. He knew it was limited. He didn't know how limited.
"More than a clean transit," Kira said. "I'll manage."
"Commander —"
"I'll manage." The command voice. The tone that closed discussions. Kira looked at the sensor display one more time. Kaine closing. The convergence zone ahead. The seal beyond it.
"Malik: finish the recalibration. Anti-ship, maximum power, targeting priority on the aft shield quadrant. Drayden: work with Cross on engagement positioning. I want us sitting exactly where we need to be when Kaine comes out of that corridor. Corvin: I need everything the pillars can give me for the convergence transit. Full output. Zeph: monitor the new bio-tissue growth during transit. If the ship's doing something new in the Expanse environment, I want to know about it before it surprises us."
The crew moved. Assignments taken, positions assumed, the warship shifting from exploration mode to combat preparation with the speed of people who had been soldiers and outcasts and survivors long enough to know that the transition was always faster than you wanted it to be.
Jax stayed.
"Kira."
She looked at him.
"You can't fight a convergence zone and a ship engagement on the same interface capacity. Something gives."
"Then I'll make sure it's Kaine."
Jax's prosthetic hand tightened on the Throne's frame. The servos whispered. He wanted to say more. She could see it in the locked muscles of his jaw, the way his flesh hand found the holster at his hip out of habit, the physical tells of a man who was watching someone he cared about make a calculation he wasn't allowed to check.
He didn't say more. He nodded once, sharp, military, and went to his station.
Kira pressed her left palm into the Throne. The passive interface fed her the Expanse's dimensional map, the convergence zone ahead, the turbulence waiting, the calm on the other side where they would sit with weapons hot and watch for Kaine's drive signature emerging from the rough water they'd left behind.
If Kaine wanted to follow in their wake, she'd make sure the water was rough.
And on the other side, Malik would be waiting with the biggest gun the Progenitors had ever built.
