The gates of the Underworld groaned shut behind them.
Not slammed—sealed, like a tomb deciding it had tolerated enough life.
The air was cold without being icy, heavy without pressure, the kind of stillness that pressed on the ears. The Fields of Asphodel stretched gray and endless, spirits drifting like ash in slow water. Grover swallowed hard. Annabeth went rigid, eyes darting, cataloging exits that didn't exist.
Cynthia felt it differently.
Not fear.
Sadness.
"Keep moving," Charon had said, already fading back into shadow. "The Lord dislikes loiterers."
They followed the obsidian path, the sound of their footsteps swallowed almost instantly.
The path narrowed as they followed the River Styx, its black waters sliding soundlessly beside them. No ripples. No reflection. Just endless dark, like the world forgetting itself.
Percy slowed.
The river tugged at him—not violently, not like the Mississippi—but with a steady pull, a reminder. You're mine too.
Cynthia noticed immediately.
"You feel it," she said under her breath.
Percy nodded. "Yeah. Like… it knows me."
Before Annabeth could comment, the surface of the Styx stirred.
A figure rose from the water, formed of liquid darkness edged with silver light. Her hair flowed like a current, eyes deep as the sea floor. The temperature dropped—not cold, but solemn.
Grover whimpered softly. "N-nereid."
The spirit inclined her head toward Percy. "Son of the Earth-Shaker."
Percy swallowed. "You… know me."
"All waters do."
She extended her hand. Resting on her palm were three pearlescent orbs, glowing faintly, warm despite the chill air.
"Gifts from your father," the Nereid said. "For the return."
Annabeth stepped forward sharply. "Return from where?"
"The realm you are about to enter," the Nereid replied evenly. "The pearls bear you from the Underworld back to the living world. One per soul."
Percy's chest tightened. "Only three?"
The Nereid's gaze softened—but she did not change her answer. "Such is the law."
Cynthia felt something twist in her chest. She hadn't done the math yet.
Grover had.
"There are four of us," he whispered.
Silence settled heavy.
Percy clenched his fists. "That's not enough."
"No," the Nereid agreed gently. "But it is all that can be given."
She turned to Cynthia then, studying her with an intensity that made the girl straighten instinctively. The river around the spirit stirred faintly.
"You walk lightly between truths," the Nereid said. "Not claimed, yet not unseen."
Cynthia said nothing. She only nodded once, respectful.
The Nereid returned her attention to Percy and closed his fingers around the pearls. "Use them only when you are clear of the dead. Think of escape, and the water will answer."
Percy hesitated. "Tell my dad—"
The Nereid smiled sadly. "He knows."
With that, she dissolved back into the Styx, the river smoothing over as if she had never been there.
For a long moment, none of them spoke.
Annabeth broke the silence first, voice tight. "Three pearls. Three people."
Grover looked down at his hooves.
Percy stared at the glowing orbs in his palm, jaw set. "We'll figure it out," he said. "We always do."
Cynthia met his eyes.
She didn't say someone won't make it.
But they both felt it.
The Underworld waited ahead.
Percy's hand kept brushing Riptide's hilt. He didn't draw it—but he stayed ready.
Then the ground vibrated.
A low, thunderous whuff rolled out of the darkness ahead, followed by the scrape of claws on stone.
Grover froze. "Oh no. Oh no no no—"
Three massive heads emerged from the gloom, each larger than a bull's, eyes glowing ember-red. Rows of teeth gleamed wet and curved, saliva steaming as it hit the floor.
Cerberus.
The guardian of the dead lowered himself into a crouch, hackles rising. One head growled. Another barked—deep, earth-shaking. The third sniffed the air, nostrils flaring.
Percy raised his sword halfway.
"Percy," Cynthia said quietly.
Her voice cut through the moment—not sharp, not loud. Steady.
"Don't."
Annabeth hissed, "Cynthia, that's Cerberus."
"I know."
Cynthia stepped forward.
Grover grabbed her sleeve in panic. "Cyn, please—he eats heroes!"
She gently slipped free. "He guards. That's different."
Cerberus's middle head snarled, jaws opening wider.
Cynthia stopped a few feet away. She didn't reach for her knives. Didn't run.
She crouched.
Slowly.
Every instinct in Percy screamed at her to move back, but something in her posture—open palms, lowered gaze—made even the monster hesitate.
"You're tired," Cynthia said softly, more feeling than certainty. "You've been here a long time."
One head tilted.
Another growled, uncertain now.
She swallowed, heart pounding, but her voice stayed calm. "You're not bad. You're doing your job. Protecting. Watching. Waiting."
She reached into her pack and pulled out the last strip of jerky she'd been saving since St. Louis. She held it out—not toward the teeth, but low, respectful.
Cerberus sniffed again.
The left head sneezed.
The right head whimpered.
Then, with a sound like a mountain settling, Cerberus lay down.
All three heads.
Grover's jaw dropped.
Annabeth whispered, "That's… impossible."
Cynthia approached slowly, laying the jerky on the stone. Cerberus slurped it up delicately, tail thumping once—hard enough to rattle the cavern.
She stroked the fur between the heads, careful, reverent. "Good guardian," she murmured. "Thank you."
Cerberus yawned and rolled onto his side, exposing his throat.
Percy exhaled a breath he hadn't realized he was holding.
They passed unharmed.
The farther they walked, the heavier the air became.
The Underworld pressed in from all sides now—ashen ground, distant screams carried on no wind at all, the black river sliding alongside them like a silent judge. Percy could feel it in his bones. Every step felt noticed.
Cynthia slowed.
Percy caught it immediately. Her stride faltered, just a fraction, but the bronze wings on her shoes fluttered—once, twice—without her moving.
"You okay?" he asked.
She frowned, looking down. "Yeah. Just—"
The wings snapped open.
Before anyone could react, Cynthia was yanked backward, boots skidding across the ashen ground. She gasped as the shoes surged upward, dragging her toward the dark chasm yawning to their left—a裂 in the earth that dropped away into endless black.
"Tartarus," Annabeth breathed.
"NO—!" Grover bleated.
Cynthia dug her fingers into the ground, nails scraping uselessly. "They're not listening—!"
Percy lunged, grabbing her wrist just as her feet lifted clear off the ground. The force nearly pulled him with her. The chasm pulled—not like wind, but like gravity itself deciding she belonged there.
Annabeth sprinted in, slashing at the leather straps with her knife. "The shoes—Luke's shoes—they're cursed!"
"They're dragging her to the pit!" Grover cried.
Cynthia clenched her jaw, fighting panic. "Don't let go," she said through gritted teeth. "Please."
Percy's arms burned. The pull was unreal, like the earth itself wanted to swallow her.
"I've got you," he snarled. "I'm not letting you go."
Annabeth hacked at the buckles, fingers shaking. One strap snapped. The wings thrashed harder, desperate now.
Grover braced himself against a rock, grabbed Percy's belt, anchoring him. "Pull!"
With a final slash, Annabeth cut the last strap.
The shoes tore free.
They vanished into the darkness with a shrill metallic whine, spiraling down into Tartarus until even the sound died.
Silence crashed down.
Percy collapsed backward, dragging Cynthia with him. They hit the ground hard, breathing like they'd just surfaced from deep water.
For a second, no one moved.
Then Cynthia laughed—short, shaky, half-hysterical. "Wow," she said. "Okay. That was… new."
Percy sat up, gripping her shoulders, eyes wide. "You almost—"
"I know," she said quietly.
Annabeth stared at the chasm, face pale. "The shoes were meant to deliver something to Tartarus," she said. "Luke didn't know… or he didn't care who they took."
Grover hugged himself. "They were choosing."
Cynthia flexed her hands, grounding herself. "Guess Tartarus didn't get the memo," she muttered. "Not today."
Percy swallowed, then pulled her into a brief, fierce hug before he could overthink it. She froze for half a second—then returned it.
"Don't ever scare me like that again," he said hoarsely.
She rested her forehead against his shoulder. "Wasn't planning on it."
They stood slowly.
The Underworld loomed ahead, darker somehow than before.
Annabeth exhaled. "Okay," she said. "Lesson learned. No godly gifts without suspicion."
Percy glanced once more at the pit where the shoes had vanished.
Someone wanted to lose her, he thought.
And that scared him more than anything else down here.
The palace of Hades rose like a blade thrust into the earth—black stone, jagged spires, torches burning with cold blue fire. Skeletal warriors lined the hall, spears crossed.
The throne room felt alive.
Hades sat upon his seat of obsidian, helm resting at his side, eyes like dark pits of infinity. Power rolled off him in waves—not explosive like Zeus, not fluid like Poseidon, but absolute.
Final.
"So," Hades said, voice echoing from everywhere and nowhere. "The living trespass."
Percy stepped forward, jaw tight. "We're here to return what was stolen."
Lightning flashed somewhere deep underground.
Hades leaned forward, fingers steepled. "You mean what you stole."
Annabeth bristled. "We didn't—"
Cynthia raised a hand slightly.
Not to silence. To steady.
"My lord," she said, meeting Hades's gaze without flinching, "facts matter."
The throne room went silent.
Hades's eyes narrowed—not in anger, but interest. "Explain."
She took a breath. "The bolt was taken from Olympus, yes. But the thief wanted war. Chaos. You gain nothing from that."
Hades scoffed. "You presume to know my interests?"
"You value balance," Cynthia replied simply. "The dead need peace. War floods your realm uncontrollably. Souls without order. That benefits no one."
Annabeth stared at her. Percy's heart pounded.
Hades studied the girl for a long moment.
"Continue."
Percy stepped in then, voice firm. "The bolt was planted on me. I didn't know. And your helm—"
Hades's power spiked. The torches flared.
"Speak carefully, child of the sea."
"It's missing," Percy finished. "And whoever took the bolt took that too. Same enemy."
Silence.
Then Hades laughed—low, dangerous. "So. A double theft."
Cynthia nodded. "Which clears you."
Hades's gaze sharpened. "And who, then, would dare?"
Percy swallowed. "Ares."
The name hit like a dropped blade.
Hades rose slowly from his throne. "The war god," he said softly. "Medals for treachery."
He turned back to Percy. "You have my bolt?"
Percy knelt and presented it.
Hades's expression shifted—not gratitude, but grim satisfaction. "Very well. I will not unleash my armies."
Relief flooded the room.
"But," Hades added, eyes locking onto Cynthia, "my helm remains stolen."
Cynthia bowed her head. "We will retrieve it."
Annabeth sucked in a breath. "That wasn't—"
"We promise," Percy said, meeting Hades's gaze. "Both items returned."
Hades studied them. Then, slowly, he smiled.
"A bargain, then," he said. "Return my helm… and I will remember this mercy."
The gates behind them creaked open.
"Go," Hades commanded. "Before I change my mind."