Chapter 42

The fungal growth on the tunnel wall moves when Cass's light hits it, and she realizes it's not growth—it's breathing.

She stops. Vera nearly collides with her back.

"What—"

"Look." Cass angles the flashlight. The blue-green mass contracts. Expands. Contracts again. Rhythmic. Deliberate.

Vera's breath catches. "That's not possible."

"Tell it that."

They're three sectors from the filtration hub. The maintenance tunnel stretches ahead, walls slick with condensation and something else. Something that wasn't here yesterday. The emergency lighting flickers. Cass counts the seconds between pulses. Four. Five. Six.

The power grid is failing.

Vera moves past her, one hand trailing the opposite wall. Away from the breathing fungus. "Marcus designed the sabotage to cascade. Small failures that compound. By the time anyone notices the pattern, the systems are already compromised."

"You knew."

"I suspected." Vera's voice is flat. Clinical. "He was always too careful. Too precise. Engineers make mistakes. Marcus never did."

Cass's fingers find her brother's dog tags through her shirt. The metal is warm from her skin. "How long have you been working with him?"

"I haven't been working with him. I've been managing him."

The distinction means nothing. Cass keeps walking. The tunnel slopes downward. Water pools in the low points, reflecting the emergency lights in fractured patterns. Something floats in the nearest pool. Cass doesn't look too closely.

"He believed he was saving people," Vera says. "That's what makes him dangerous. Not malice. Conviction."

"That's surface thinking."

"Is it?" Vera stops at a junction. Three tunnels branch off. She chooses the middle one without hesitation. "Marcus ran the numbers. Calculated how many people the colony could sustain with degraded systems. Decided a controlled collapse would save more lives than a slow decline."

"He doesn't get to decide who lives."

"Someone always does." Vera's hand finds a rung on the wall. A ladder leading up. "The filtration hub is through here. Stay close. The spore concentration increases near the ventilation systems."

Cass climbs. Her shoulders burn. The ladder is slick. Thirty rungs. Forty. The air thickens. She tastes copper and something organic. Decay and growth happening simultaneously.

The hatch at the top is sealed. Vera produces a key card from her jacket. Swipes it. Nothing happens.

"He's locked us out," Vera says.

Cass pulls herself level with the hatch. Studies the seal. Standard pressure lock. Magnetic clamps. She's bypassed a hundred of these in the scrap yards. "Move."

She wedges her fingers into the gap between hatch and frame. Finds the manual release. Pulls. The clamps disengage with a hiss. The hatch swings open.

The filtration hub spreads before them. Massive. Industrial. Pipes thick as tree trunks converge on central processors. The air hums with machinery. But the hum is wrong. Stuttering. Arrhythmic.

And the fungus is everywhere.

Not just on the walls. On the pipes. The processors. Growing in geometric patterns that shouldn't exist in nature. Blue-green fractals spreading across every surface. The bioluminescence pulses in waves. Like a heartbeat.

Cass drops into the hub. Her boots splash in standing water. The floor is flooded. Six inches deep. The water glows faintly.

"Don't touch it," Vera says.

"Wasn't planning to."

They wade through the water. Cass keeps her hands above the surface. The processors tower around them. Each one the size of a small building. The fungal growth is thickest near the ventilation intakes. Cass sees why. The spores are being pulled through the system. Distributed throughout the colony.

Marcus didn't just sabotage the filters. He weaponized them.

Voices ahead. Raised. Angry.

Cass moves faster. The water drags at her legs. Vera keeps pace beside her. They round a processor and the control room comes into view.

Finn is already there.

He stands in front of the main terminal. His father faces him across the console. Marcus Osric is smaller than Cass expected. Thin. Gray hair receding. Wire-frame glasses. He looks like someone's grandfather. Not a mass murderer.

"You don't understand," Marcus is saying. "The colony was dying anyway. Slow starvation. Resource wars. I gave them a clean end."

"You gave them nothing." Finn's voice shakes. "You took everything."

Marcus sees Cass and Vera. His expression doesn't change. "Vera. I wondered when you'd arrive."

"Marcus." Vera's tone is conversational. Like they're discussing weather. "You've made quite a mess."

"I've made a decision. There's a difference."

Cass moves to Finn's side. He doesn't look at her. His eyes are locked on his father. His hands are fists.

"How long?" Finn asks. "How long have you been planning this?"

"Three years. Since the harvest projections showed the decline. I ran every scenario. Every possible solution. They all ended the same way. Collapse. Chaos. Suffering." Marcus adjusts his glasses. "This way is faster. Kinder."

"Kinder." Finn's laugh is broken. "You murdered hundreds of people."

"I spared them worse."

The control room is smaller than Cass expected. Banks of monitors line the walls. Most show static. A few display system readouts. All of them are red. Critical failure across every metric.

Cass studies the terminal. The interface is locked. Password protected. She could crack it given time. But time is something they don't have.

"The mine shaft codes," she says. "Where are they?"

Marcus looks at her. Really looks. His eyes are calm. Analytical. "You're the scavenger. Tennant's sister."

"The codes."

"In my head. Memorized. Nowhere else." He taps his temple. "Insurance."

Vera moves around the console. Casual. Unhurried. "Marcus. We had an agreement. You would provide the codes when the time came."

"The agreement was predicated on controlled evacuation. This—" He gestures at the monitors. At the fungal growth creeping across the walls. "This is chaos. The breach accelerated beyond projections."

"Because you accelerated it," Finn says. "The final sabotage. You opened the Deep sector seals."

Marcus doesn't deny it. "The infected were suffering. Aware but trapped. I gave them release."

"You gave them access to the rest of the colony."

"A miscalculation. The fungus adapted faster than the models predicted." Marcus's voice remains steady. Reasonable. "But the outcome is the same. The colony ends. The only question is who survives."

Cass's nails dig into her palms. Crescents of pain. "Give us the codes."

"Why should I?" Marcus looks at Finn. "So you can save people who are already dead? So you can drag out their suffering another few weeks in those mine shafts before the supplies run out?"

"That's not your choice to make," Finn says.

"Someone has to choose. Someone always has to choose." Marcus sits down. The chair creaks. "I chose. I accept the consequences."

The monitors flicker. One goes dark. Then another. The power grid is failing faster now. Cass counts the remaining screens. Twelve. Eleven. Ten.

Vera produces a gun from her jacket. Small. Compact. She doesn't point it at anyone. Just holds it. Visible.

"Marcus," she says. "The codes. Now."

He looks at the gun. At her. "You won't shoot me. You need me."

"I need the codes. You're just the container."

Something shifts in Marcus's expression. Not fear. Recognition. "You were never going to let me evacuate with the others."

"No."

"You were using me."

"Yes."

Marcus laughs. Soft. Almost fond. "I should have seen it. You're better at this than I am."

"I've had more practice." Vera's hand is steady. "The codes, Marcus. Don't make this harder than it needs to be."

The fungal growth on the walls pulses. Brighter. Faster. Cass feels it in her chest. Like a second heartbeat overlaying her own.

Finn steps between his father and Vera. "Wait."

"Move aside," Vera says.

"He's my father."

"He's a mass murderer."

"He's still my father." Finn's voice cracks. "There has to be another way."

Marcus stands. Slowly. His hands are visible. Empty. "There isn't, son. There never was. I knew what I was doing. I knew what it would cost." He looks at Vera. "I knew what she would do when it was over."

"Then why?" Finn's question is barely audible. "Why do any of it?"

"Because someone had to. Because the numbers don't lie. Because a quick death is kinder than watching your children starve." Marcus's composure finally cracks. "Because I couldn't save everyone, but I could save some. And that had to be enough."

The monitors continue dying. Nine screens. Eight. Seven.

Cass moves to the terminal. Studies the lock. "How long to crack this?"

"Hours," Finn says. "Maybe days. The encryption is military grade."

"We don't have hours."

"I know."

Marcus watches them. "I'll give you the codes. On one condition."

"You're not in a position to negotiate," Vera says.

"I'm in the only position that matters. I have what you need." Marcus looks at Finn. "You help me reach the evacuation point. You make sure I get on one of those transports. Then I'll give you the codes."

"No," Cass says.

"It's not your decision."

"Like hell it isn't." She turns to Finn. "You don't owe him anything."

"He's my father."

"He's a murderer. He killed hundreds of people. He's killing more right now." Cass points at the monitors. At the fungal growth. At the systems failing around them. "Every second we waste, more people die."

"I know." Finn's hands shake. "I know what he did. I know what he is. But he's still—"

"Still what? Still your father? That doesn't erase what he's done."

"I'm not trying to erase it. I'm trying to—" Finn stops. Breathes. "I don't know what I'm trying to do."

Marcus watches his son. Something like regret crosses his face. "I never wanted you to see this. Any of this. I wanted you safe. Away from the decisions. Away from the blood."

"You don't get to protect me from your choices," Finn says.

"No. I suppose I don't."

The fungal growth reaches the control room door. Tendrils creep across the threshold. Blue-green. Pulsing. Alive in ways that violate every natural law Cass knows.

Vera raises the gun. Points it at Marcus. "Last chance. The codes. Or I shoot you and we find another way."

"There is no other way. The encryption is biometric. Keyed to my neural patterns. You kill me, the codes die with me." Marcus spreads his hands. "So. Do we have a deal?"

Finn looks at Cass. His eyes are desperate. Lost. "What do I do?"

She wants to tell him. Wants to make the choice for him. But this isn't her decision. It's his. And he has to live with it.

"You don't owe him your soul," she says. "Whatever you choose, you don't owe him that."

Finn turns back to his father. The monitors flicker. Six screens. Five. Four.

"The codes," Finn says. "Give me the codes. Then we'll talk about evacuation."

"That's not how this works—"

"That's exactly how this works. You give me the codes. You prove they're real. Then we discuss what happens next."

Marcus studies his son. Calculating. Weighing options. "You've grown up."

"I had to."

"Yes. I suppose you did." Marcus moves to the terminal. Slowly. Vera tracks him with the gun. He enters a command sequence. The lock disengages. "The codes are in the system. Encrypted. But accessible now."

Finn pushes past him. His fingers fly across the keyboard. Cass watches the screen. Watches the data scroll past. Mine shaft locations. Access protocols. Evacuation procedures.

"It's real," Finn says. "It's all here."

"Of course it's real. I'm many things, but I'm not a liar." Marcus steps back. "Now. Our agreement."

Finn's hands hover over the keyboard. "I can't."

"Can't what?"

"I can't let you go. I can't—" Finn's voice breaks. "You killed people. You killed so many people. And you'd do it again. You'd justify it. You'd run the numbers and decide who deserves to live and who doesn't and you'd sleep fine at night because you believe you're right."

"I am right."

"No. You're not. You're just convinced. And that's worse." Finn enters another command. The mine shaft locks disengage. Across the colony. Across every sector. "The codes are active. The shafts are open. People can evacuate."

Marcus's face goes pale. "What have you done?"

"What you should have done. Given people a choice."

"You've killed them. Without coordination, without planning, they'll panic. They'll stampede. More will die in the chaos than the fungus would have taken."

"Maybe. But it's their choice. Not yours. Not mine. Theirs."

Marcus lunges for the terminal. For the emergency override. Vera's gun tracks him. Cass sees it happening. Sees the trajectory. Sees Finn between them.

"Don't—" she starts.

The gun fires.

The sound is massive in the enclosed space. Cass's ears ring. She sees Marcus stumble. Sees Finn's eyes go wide. Sees blood.

But she can't tell whose.

Marcus clutches his shoulder. Red spreads across his shirt. He's still standing. Still moving toward the override.

Finn is frozen. Staring at his father. At the blood. At Vera.

Vera's hand is steady. The gun hasn't moved. "Stay down, Marcus."

But Marcus doesn't stay down. He reaches for the override. His fingers brush the controls.

Finn moves. Fast. Desperate. He grabs his father's arm. Pulls him back.

Marcus twists. His elbow catches Finn in the chest. Finn staggers.

Cass is already moving. She hits Marcus low. Tackles him away from the terminal. They go down hard. Marcus's head cracks against the floor. He goes limp.

Cass rolls off him. Checks his pulse. Still there. Weak but steady.

Finn is on his knees. Breathing hard. His hands are shaking.

Vera lowers the gun. "Is he—"

"Alive," Cass says. "Unconscious."

The monitors die. All of them. The control room goes dark except for the bioluminescent fungus. It's brighter now. Spreading faster. The tendrils reach the terminal. Wrap around the base.

"We need to move," Vera says.

Finn doesn't move. He's staring at his father. At the blood. At the man who raised him and murdered hundreds and believed he was saving them.

Cass touches his shoulder. "Finn."

"I couldn't do it," he says. "I couldn't let him go. But I couldn't—"

"I know."

"He's my father."

"I know."

The fungus reaches Marcus. Covers his legs. His chest. Blue-green tendrils spreading across his unconscious body.

Finn reaches for him. Cass catches his hand. "Don't."

"We can't just leave him."

"We can't save him."

"Cass—"

"Look at him. Look at the fungus. It's already too late."

Finn looks. Sees the tendrils wrapping around his father's throat. Sees the bioluminescence pulsing in rhythm with a heartbeat that isn't human anymore.

"We have to go," Vera says. "Now."

They run. Through the flooded hub. Past the processors. Past the fungal growth spreading across every surface. The water glows brighter. The air thickens. Cass's lungs burn.

Behind them, something moves. Not Marcus. Something bigger. Something that used to be human but isn't anymore.

They reach the ladder. Cass climbs first. Finn follows. Vera brings up the rear. The hatch is still open. Cass pulls herself through. Reaches down. Helps Finn up.

Vera's hand appears. Cass grabs it. Pulls.

Something grabs Vera's leg.

Vera screams. The sound is raw. Primal. Cass holds on. Finn grabs Vera's other arm. They pull.

The thing below pulls harder.

Vera's grip slips. Her fingers slide through Cass's hand. Inch by inch.

"Don't let go," Vera says.

"I'm not—"

Vera's hand tears free. She falls. Into the hub. Into the glowing water. Into the mass of fungal growth and infected bodies rising from the depths.

The hatch slams shut. Automatic seal. Magnetic clamps engage.

Cass and Finn are alone in the tunnel. Breathing hard. Covered in water that glows faintly in the darkness.

From below, through the sealed hatch, they hear screaming.

Then nothing.