The iron harbor chains of Oakhaven fell with a sound like a dying giant’s scream.

Across the ice-slicked wooden planks of the Oakhaven Docks, Captain Vance’s voice cut through the freezing fog, sharp and unyielding as a bone spear. "Drop the anchors! Secure those mooring lines! By order of the Council, that vessel does not leave this harbor!"

Cormac Reed did not look at the harbor master. His boots were wedged against the wet oak deck of the Ember, his body leaning heavily against the massive wooden tiller. His right hand—wrapped tightly in the coarse, grease-stained wool of Maeve’s red scarf—was already screaming. Underneath the damp fabric, the fresh heat blisters from the forge and the waxy, numb patches of deep frost-nip were beginning to split. The salt from his own blood was warm, but it was a fleeting heat, rapidly stolen by the sub-zero wind that howled off the frozen lake.

"Garrick!" Cormac roared, his voice a gravelly rasp that barely carried over the grinding of the harbor gates. "We’re losing the channel! Give me everything!"

Below deck, in the cramped, soot-choked belly of the longboat, Garrick Vance did not answer with words. He answered with the raw, violent hiss of overpressurized steam. The muscular stoker threw his weight against the primary draft lever, bypassing the boiler’s safety vents. He began shoveling the smuggled high-grade anthracite directly into the white-hot core of the furnace. It was pure, oil-rich Oakhaven coal, and as it hit the grates, the engine room didn’t just rumble—it vibrated with a high-pitched, metallic thrum that rattled the deck plates beneath Cormac’s feet.

"The pressure gauge is redlining!" Silas Vance shrieked from the navigation hatch, his fingers white as he clutched his father’s seal on his chest. His face was a mask of pale, sweating terror in the dim moonlight. "The welds won't hold, Cormac! We're going to blow the hull before we even hit the current!"

"Hold your tongue and watch the ice!" Cormac growled. He adjusted his grip on the tiller, the rough wood biting into his split blisters. Every nerve in his arm flared with white-hot agony, but he did not let go. He couldn't. Nora had forty-eight hours. The cold was already hardening the air in her lungs back at the homestead, and every second they wasted on this dock was a second stolen from her life.

Through the swirling rime, the harbor guards lunged forward, their iron-plated coats clanging. Three of them managed to throw a heavy, spiked grappling chain over the Ember’s starboard gunwale, the iron teeth biting into the oak timbers with a sickening crunch. The boat groaned, its momentum dragging against the guards’ anchors.

"Cut it!" Garrick yelled, his head emerging from the engine hatch, sweat washing clean lines through the soot on his face.

Cormac reached down with his left hand, his good hand, and pulled the heavy iron-cutting chisel from his belt. He couldn't use his right. He slammed the chisel against the link and struck it with the flat of his heavy dive-knife. Spark exploded in the dark. Once. Twice. On the third strike, the iron link sheared, and the tensioned chain whipped back across the ice, sending a guard sprawling into the freezing slipway.

"She’s moving!" Finn shouted from the bow, his brass spyglass pressed to his eye. "But the ice is thickening at the mouth!"

"Ram it!" Cormac commanded.

The Ember surged. The high-grade coal was doing its work, pushing the small steam engine far past its intended capacity. The copper plating on the bow—Greta’s last masterpiece—struck the black, jagged ice sheet at the harbor mouth with a sound like a collapsing glacier. Shards of ice as hard as tempered steel flew into the air, scraping against the reinforced hull. The boat shuddered violently, throwing Silas against the bulkhead, but the copper-clad prow cut through, splitting the floe into two massive, drifting wedges.

They were free of the docks, but the victory was instantly swallowed by a deeper, more terrifying sound.

It was a low, subterranean roar—a physical vibration that traveled through the water and into the wooden bones of the vessel. Ahead of them, the frozen surface of the lake simply ended. The drainage canal, carved by the ancient Cinder-Builders centuries ago, emptied directly into the Great Chasm, a pitch-black fissure in the earth where the entire volume of the lake plunged into the dark.

"Current’s catching us!" Finn screamed, his voice thin with panic as he scrambled back from the bow. "The drag anchors! We need to slow her down!"

"Deploy the drags!" Cormac ordered.

Two deckhands threw the heavy manual drag anchors over the stern. The thick hemp ropes snapped taut with a sound like pistol shots. For a second, the Ember’s stern dipped, her bow lifting as she fought the terrifying suction of the chasm. But the downward current of the Great Chasm was not a natural river; it was a violent, pressurized vortex. With a sickening *crack*, the iron anchor lines didn't just slip—they snapped entirely, the tensioned ropes whipping back and slicing through the wooden bulwarks.

"Anchors are gone!" Silas wailed, his voice cracking. "We're going over!"

"Garrick, cut the engine to neutral!" Cormac shouted down the hatch.

"What?" Garrick’s soot-stained face popped up, his eyes wide. "If we don't have power, we can't steer!"

"If we fight the current with the engine, we’ll pitch bow-first and capsize!" Cormac’s voice was calm, cold, and absolute. He had spent ten years reading the water, listening to the weight of the ice. "Cut the power! Let her drift with the flow, and I’ll steer with the momentum!"

He felt the vibration of the engine die down to a low, idling rumble. The Ember was instantly claimed by the black water. The boat accelerated, the dark basalt walls of the chasm rising up on either side like the jaws of a colossal beast. The freezing spray hit Cormac’s face, turning to instant rime on his eyelashes and eyebrows. He could feel the temperature dropping with every yard of descent—not the dry, biting cold of the surface, but a heavy, wet, pressurized chill that seemed to squeeze the air directly out of his chest.

His right hand was failing him. The intense cold of the spray was turning his fingers to stone, the nerve damage from his past dives deadening what little sensation he had left. He couldn't feel the tiller anymore. He was steering by the visual alignment of the bow against the dark walls, his arms shaking with the physical strain of keeping the heavy oak rudder straight.

Panic, cold and familiar, began to claw at his throat. It was the same panic that had frozen him five years ago, the same dark water that had swallowed his younger brother, Kieran Jr., while Cormac watched, paralyzed by the current.

*Not again. Not her.*

With a desperate, clumsy movement, Cormac reached into his caribou-skin coat with his left hand and clutched the small copper flask hanging around his neck—Nora's Spruce-Oil Flask. He unscrewed the cap with his teeth and inhaled. The sharp, aromatic scent of pine oil cut through the sulfurous stench of the coal smoke and the wet rot of the chasm. It was a clean smell, a smell of the surface, of the warm cabin, of a promise made to a little girl who was still waiting.

His heart rate slowed. His breathing settled into the deep, rhythmic pattern Donald Glenn had taught him.

"Brace!" Cormac roared, his voice echoing off the wet stone walls.

The Ember hit the lip of the fall.

It was a thirty-foot vertical plunge into the dark. For a terrifying, weightless second, the G-force pulled the stomach out of Cormac's chest. The longboat was airborne, suspended in a cloud of freezing spray and absolute blackness. The roar of the surface world—the wind, the shouts of the guards, the crackle of the fires—was instantly cut off, replaced by the deafening, pressurized thunder of falling water.

Then came the impact.

The Ember struck the deep basin of the Frost-veins with a force that warped the copper plates on her bow and sent a torrent of freezing, black water washing over the deck. The hull groaned, the timbers flexing to their absolute limits as the water tried to swallow them. Cormac was thrown forward, his chest slamming against the tiller, his injured hand catching the full weight of his body. The pain was blinding, a white flash that threatened to turn his vision dark.

But he held on. He pulled himself up, his eyes straining against the absolute, pitch-black void of the subterranean world.

The roar of the waterfall behind them slowly faded into the distance, replaced by a silence so thick, so heavy, that it felt like a physical weight pressing against their eardrums. The air was dead, cold, and thick with the scent of wet stone and ancient ice.

"Is... is everyone alive?" Toby Miller’s voice trembled from the deck, small and fragile in the dark.

"We're afloat," Garrick panted from the engine hatch, his voice muffled by the damp air. "But the steering's heavy. We took on water in the bilge."

Cormac reached inside his coat, his trembling, blood-soaked fingers finding the cold brass frame of the Hearth-Lantern. He pulled it out, his thumb searching for the spark-striker. The internal core was cold, emitting only a faint, erratic blue spark that barely illuminated the cracked double-pane glass.

They were miles beneath the earth, cut off from the surface, with a damaged boat, a freezing crew, and a light that was slowly dying.