6. The Ammonia Equation

The rendezvous happened at dawn, exactly as Strakhov had said it would.

Aldric stood on the upper deck, his back pressed against the cold steel of the superstructure, watching the supply ship materialize out of the morning fog like a ghost assuming solid form. She was smaller than the Iron Horizon, a converted offshore supply vessel with a faded blue hull and a name painted on her bow in letters that had been allowed to weather into near-illegibility: Kestrel. Her deck was crowded with shipping containers and fuel bladders and the bundled shapes of equipment that Aldric could not identify from this distance.

The two ships converged with the slow, deliberate choreography of vessels that had done this many times before. Lines were thrown and caught. Fenders were deployed, massive rubber cylinders that absorbed the grinding pressure of hull against hull. A gangway was lowered, and men began to move between the ships, carrying boxes and crates and the silent, efficient commerce of a supply transfer.

But Aldric was not watching the supplies. He was watching the people.

Three men came aboard from the Kestrel. They wore civilian clothes, not the uniforms of merchant mariners, and they carried no cargo. They were met at the rail by the first mate, a thickset man named Goren whose face was a permanent scowl, and they were escorted immediately into the superstructure, toward the officers' quarters. They did not look at the crew. They did not look at the ship. They moved with the focused, purposeful gait of men who had business to conduct and did not wish to be observed conducting it.

"Who are they?" Aldric asked.

Felix had appeared beside him, silent as always. The old engineer had a cup of coffee in his hand, the liquid black and thick as crude oil. "Company men. They come on every supply rendezvous. They meet with the captain. They review the catch records. They inspect the processing equipment. Sometimes they interview crew members."

"Interview them about what?"

"No one knows. The crew members who are interviewed never talk about it afterward." Felix took a sip of his coffee. "Most of them request transfer off the ship within a week. The transfers are never granted."

Aldric watched the three men disappear into the superstructure. Company men. Veridian Maritime Solutions, presumably, or whatever entity actually stood behind that paper façade. They came aboard, they reviewed the records, and they left. And the ship kept sailing, and the crew kept dying, and nothing ever changed.

"What else happens during a rendezvous?" Aldric asked.

"Fuel. Food. Spare parts, if we're lucky. New crew members, if we need them." Felix paused. "And sometimes the opposite."

"The opposite?"

"Sometimes crew members are transferred off the ship. The ones who are too sick to work. The ones who have caused too much trouble. The ones the captain decides are no longer useful." Felix's voice was carefully neutral. "They go aboard the Kestrel. They are never seen again."

Aldric thought about Pavel. The man with the fractured skull, lying in the medical cabin, his brain swelling against the inside of his cranium. "Is Pavel being transferred?"

"I don't know. Tegan was arguing with the captain about it last night. I heard them through the bulkhead. She wanted him taken to a hospital. The captain said the Kestrel would take him." Felix's expression flickered. "But the Kestrel doesn't have a hospital. It doesn't even have a proper medic, as far as I know."

"Then where would they take him?"

Felix did not answer. He did not need to.

Aldric pushed off from the superstructure and walked toward the gangway. He was not sure what he intended to do. He was the chief engineer, not a doctor, not a human rights investigator, not anything except a man who had signed a contract and was now trapped inside it. But he could not stand on the deck and watch men disappear without at least trying to understand where they were going.

The gangway was guarded by two of Strakhov's officers, men Aldric had seen patrolling the decks with the casual, confident swagger of those who carried weapons and knew they would never be questioned. One of them stepped forward as Aldric approached, his hand resting on the baton at his belt.

"The supply ship is off-limits to crew," the officer said. His accent was Valdostan, the same guttural growl as the captain's.

"I'm the chief engineer. I need to inspect their pumping equipment. We're having issues with the fuel transfer system."

It was a lie, but it was a plausible lie. The fuel transfer system was indeed temperamental, a fact that Aldric had noted during his first tour of the engine room. And chief engineers did have authority to inspect equipment on vessels that were transferring fuel to their ship.

The officer hesitated, his eyes flicking to his companion. The silent consultation passed between them, and then the first officer stepped aside.

"Five minutes," he said. "Don't speak to anyone. Don't touch anything except the pumping equipment."

Aldric crossed the gangway.

The Kestrel was a different world from the Iron Horizon. Where the trawler was rusted and neglected, the supply ship was clean and well-maintained, her deck plates freshly painted, her equipment modern and functional. The contrast was so stark that Aldric felt a physical shock as he stepped from one vessel to the other, as if he had crossed a border between two countries that happened to occupy the same sea.

A man was waiting for him on the other side. He was young, perhaps thirty, with the clean-shaven face and pressed uniform of a professional merchant officer. His expression was wary but not hostile.

"You're the engineer from the trawler," he said.

"Chief engineer. I need to look at your fuel transfer pumps."

"They're aft. I'll take you." The man fell into step beside Aldric. "I'm Karsten. Second mate."

"Aldric."

They walked aft along the Kestrel's deck, past the stacked shipping containers and the fuel bladders, past a crew of men who were loading crates onto a pallet for transfer to the trawler. The Kestrel's crew moved with the efficiency of men who knew their jobs and were allowed to do them without fear. They made eye contact. They nodded greetings. They did not flinch when an officer walked past.

"The pumping equipment is fine," Aldric said quietly, when they were out of earshot of the gangway. "I needed an excuse to come aboard."

Karsten stopped walking. His expression had changed, the professional neutrality giving way to something more guarded. "Why?"

"Because I've been on the Iron Horizon for less than a week, and I've already seen enough to know that something is very wrong. Men are dying. Men are disappearing. The crew is being worked to exhaustion and beaten when they complain. And no one seems to know who's running the operation."

Karsten was silent for a long moment. The sea hissed against the hull. The wind carried the smell of diesel and fish and the faint, sweet odor of the supply ship's fresh paint.

"How long have you been aboard?" Karsten asked.

"Five days."

"And you already know this much." Karsten's voice was low, barely above a whisper. "Most of the replacement crew don't figure it out for weeks. Some of them never do."

"You know what's happening on that ship?"

"I know enough." Karsten glanced over his shoulder, checking that no one was within earshot. "I've been on the Kestrel for eighteen months. I've made this rendezvous a dozen times. I've seen the crew of the Iron Horizon change, voyage by voyage. The ones who were there at the beginning are gone now. All of them. Replaced by new faces who are thinner and more frightened than the ones before."

"Where do they go? The ones who disappear?"

"Some of them are transferred to other ships. The company operates six trawlers in the Sarendian Sea, all of them flagged in Valdosta, all of them running the same operation. They shuffle crew between the ships to prevent anyone from building relationships, from organizing, from figuring out how to fight back." Karsten paused. "The ones who are too sick or too injured to work go somewhere else. I don't know where. I'm not sure anyone does."

Aldric felt the coldness in his chest deepen. Six ships. Six floating prisons, each one carrying forty or fifty men who had been lured aboard with false promises and then trapped by contracts that were designed to be inescapable.

"The authorities," Aldric said. "The Valdostan maritime police. The Sarendian coast guard. Someone must be investigating."

"The Valdostan authorities are paid not to investigate. The Sarendian authorities have no jurisdiction in international waters. And the company makes sure that none of the ships ever enter territorial waters where they could be boarded." Karsten's voice was bitter. "It's a perfect system. The ships are invisible. The crew are invisible. The money disappears into shell companies in Valdosta and Meridia and the Austran Confederation. No one can touch it. No one can stop it."

"The Kestrel is part of this system."

"Yes." Karsten met Aldric's eyes. "I'm part of it too. I deliver the supplies. I carry the replacement crew. I take away the ones who are too broken to work. I don't ask where they're going. I don't ask what happens to them. I do my job and I collect my pay and I tell myself that I'm not responsible for what happens on the ships I service."

"But you're telling me this now."

"Because you asked." Karsten's expression was unreadable. "And because you're the first person from that ship who has ever come aboard and asked a question that wasn't about food or water or when the next supply run would be. The others are too afraid. Or too broken. Or too busy trying to survive."

Aldric looked aft, toward the Iron Horizon. From this angle, the trawler looked even worse than it had at the dock in Port Halcyon. The rust, the grime, the general air of neglect—it was the face of a ship that was being consumed by its own operation, that was being run into the ground because the company knew it would never be inspected, never be held accountable, never be asked to justify the conditions under which its crew lived and died.

"There's a man on the trawler," Aldric said. "A crew member named Pavel. He has a skull fracture. The medic says he'll die without a hospital. The captain says he's being transferred to the Kestrel today."

Karsten's face went very still. "I haven't been told about any medical transfer."

"Then where is he going?"

"I don't know. But if the captain says he's being transferred to us, and I haven't been told about it, then he's not being transferred to us." Karsten's voice had dropped even lower. "He's being transferred to the sea."

The words hung in the air between them. Aldric thought about Pavel, lying unconscious in the medical cabin, his bandaged head seeping blood, his breathing shallow and irregular. He thought about Tegan, injecting mannitol into his IV line, fighting a losing battle against the swelling inside his skull. He thought about the locked compartment below the bilge deck and the words Mirek had whispered: the men who go into that compartment don't come back out.

"I have to go back," Aldric said.

"Yes." Karsten reached into his pocket and withdrew a small object, which he pressed into Aldric's palm. It was a USB drive, small and black, unremarkable in every way. "This contains the registration numbers of all six trawlers in the company's fleet. Their last known positions. The names of the shell companies that own them. I've been collecting it for months, in case I ever found someone who could use it."

"Why are you giving it to me?"

"Because you asked." Karsten turned away. "And because I'm tired of telling myself I'm not responsible. The pumping equipment is fine. You should go back now, before someone notices you've been gone too long."

Aldric closed his hand around the USB drive. It was small and cold and impossibly heavy, as if it contained not data but the weight of everything he had learned in the past five days.

He crossed the gangway without speaking to anyone. The guards at the rail did not stop him. The crew members loading supplies did not look up. He walked back through the processing deck, past the sorting tables and the gutting machines, past Mirek who was still scraping at the same patch of dried blood as if the past day had not happened.

In the engine room, Felix was waiting for him.

"The captain wants to see you," Felix said. "On the bridge. Immediately."

Aldric nodded. He did not ask why. He already knew. Strakhov had heard about his visit to the Kestrel. Strakhov had questions. And Strakhov was not a man who tolerated questions from his crew.

He climbed the ladder to the bridge level, the USB drive burning in his pocket like a live coal. The bridge was at the top of the superstructure, a wide compartment with windows on all sides that looked out over the sea. The fog had lifted, revealing a gray expanse of water that stretched to the horizon in every direction, empty of other ships, empty of land, empty of anything except the sea and the sky and the Iron Horizon itself.

Captain Strakhov was standing at the helm, his back to the door. He did not turn when Aldric entered.

"Mr. Voss," he said. "I understand you visited the Kestrel."

"To inspect the fuel transfer pumps. They're functioning correctly."

"Yes. I'm sure they are." Strakhov turned, and his pale eyes fixed on Aldric with an intensity that was almost physical. "You are an engineer. A very good one, from what I've seen. You fixed the compressor. You repaired the ammonia leak. You are competent and thorough and you do not complain. These are qualities I value."

"I'm glad to hear that."

"But there is another quality that I value even more." Strakhov took a step closer. "Obedience. I gave you an order when you came aboard. Do you remember it?"

"Several orders."

"The most important one. I told you that the bilge pumps were not your concern. I told you that the locked compartment was a storage locker. I told you to focus on your duties and not to ask questions about things that do not concern you."

Aldric said nothing.

"Today, you went aboard the supply ship without permission. You spoke to a member of its crew. You asked questions." Strakhov's voice was soft, almost gentle, but there was something beneath it that was not gentle at all. "What did you ask about, Mr. Voss?"

"The pumping equipment."

"Do not lie to me." The words were spoken without emphasis, without heat, but they carried the weight of absolute authority. "I have been the master of this ship for seven years. I have seen engineers come and go. I have seen crew members come and go. I have seen men who asked too many questions disappear into the sea. Do you understand what I am telling you?"

"Yes."

"Good. Then let me be clear. You are the chief engineer of the Iron Horizon. Your duties are in the engine room. You will not go aboard the supply ship again. You will not speak to its crew. You will not ask questions about the company's operations or the crew's welfare or the locked compartment below the bilge deck. If you violate these orders, there will be consequences. Do you understand?"

"Yes."

Strakhov held his gaze for a long moment. Then he nodded, a small, economical movement, and turned back to the helm.

"You may go," he said. "The fishing operation begins in one hour. I expect the processing equipment to be fully operational."

Aldric left the bridge. His heart was pounding, but his hands were steady. The USB drive was still in his pocket, and the weight of it was a reminder that Karsten had given him something valuable—something that might, if he could find a way to use it, be the key to bringing the entire operation down.

But first he had to survive. First he had to navigate the machinery of the Iron Horizon, the captain and his officers and the locked compartment and the disappearances that happened in the night. First he had to figure out how to stay alive long enough to use what he had been given.

He descended the ladder toward the engine room, toward the machines that were his responsibility, toward the systems that he was expected to keep running while the ship consumed its crew.

And in his pocket, the USB drive waited.