Prologue

The dead ship rang its bell before I saw it.

One note crossed the Nattr sea through fog so thick it erased the horizon. It was not loud. It did not need to be. The sound entered through my rib-gills and settled behind my lungs, cold as a hook.

Every sailor on the Mercy of Salt froze.

“Again,” I said.

No one answered. The living knew better than to invite a second call from a bell that had no tower.

I stood at the bow with snow gathering in my hair and watched the water. The fjord had narrowed around us into black walls of stone. Red aurora drifted above the cliffs, turning the storm clouds the color of old blood. Below, the sea moved in slow, heavy folds, carrying ice, wreckwood, and the occasional pale hand that vanished before any of the crew could name it.

The bell rang a second time.

The fog opened.

A cathedral galleon waited inside it.

Its hull was trapped in an iceberg tall as a palace. Whale-bone arches rose from its decks. Broken stained-glass windows glimmered through blue ice. The sails hung in strips, stiff as burial cloth, and every length of rigging shifted although there was no wind. The ship was not drifting. It was holding itself in place at the mouth of the fjord, patient as a trap.

“That is the Varg’s Mercy,” Nessa whispered.

No one corrected her. Every child in the northern ports knew the name. Captain Soren Varg had sailed it under privateer colors until the night it disappeared with three refugee ships and a royal treasury. The crown said a siren sank him. The survivors said the captain had sold them to the sea.

I had never claimed either story was false.

The ghost heart in my satchel began to beat.

Once.

Twice.

The leather strap at my shoulder warmed against my skin. I put a hand over it and felt the impossible pulse answer mine. I had taken the heart from a wreck divers called the Blue Chapel, paying for it with an oath I no longer remembered making. It was not flesh. It was a knot of black glass and drowned light, cold until it wanted something.

Tonight, it wanted the ship.

“We turn back,” Nessa said.

She was my oldest friend and the only member of the crew who still spoke to me as if I were a woman instead of a weapon. Her fingers tightened around the wheel. “Elka, this is not salvage. The ice has eaten that ship for twenty years.”

“Twenty-one.”

I did not know why I knew that. The answer rose from the heart in my satchel as naturally as a note from my throat.

The bell rang a third time. The Mercy of Salt’s lanterns went out.

Darkness closed around us. In it, my throat sacs began to glow blue-white. The light spilled across the deck, over frightened faces, over wet ropes and ice-black railings. It made the crew look like people already underwater.

“If we leave,” I said, “the fjord closes behind us.”

As if the ship had heard, a groan rolled through the cliffs. Black ice thrust up from the sea behind our stern, sealing the channel in a wall of jagged glass.

Nessa swore softly.

The ghost heart beat again. This time it showed me a memory.

Not mine.

A man’s hands on a chart table. A signet ring marked with a crown. A line of refugees waiting below deck. The sharp edge of a contract, unsigned. Then water. Too much water. A voice singing through a hull while someone screamed a name I had spent twenty-one years refusing to remember.

Soren.

The memory broke. I was back on the bow with ice cutting through my boots.

I had drowned him.

I had also been paid to do it.

Those two facts had kept me alive because I had arranged them in the right order: contract first, death second, guilt somewhere far below both. If the heart was telling the truth, the order was wrong. Or incomplete. On the Nattr sea, incomplete truth was often more dangerous than a lie.

“Lower the skiff,” I said.

No one moved.

“Elka.” Nessa’s voice cracked. “You cannot board that thing alone.”

“It will not take anyone else.”

That, too, came from the heart.

I stripped off my outer coat and passed my sword belt to Nessa. Beneath the leather harness, the translucent fin structures along my shoulders and ribs lifted in the wind, thin as ice-clear wings. The crew looked away from my teeth when I smiled. They had seen me hunt sea beasts. They had seen me cut open storm currents with song. They had never seen me afraid.

I was afraid now.

The skiff crossed the frozen water without oars. Ropes from the cathedral galleon reached down through the fog, moving like patient fingers. I could have sung them apart. I could have turned back. Instead I held the ghost heart against my chest and let the ship draw me in.

When my boots touched the Varg’s Mercy, every rope on deck went still.

The air became cold enough to hurt.

He stepped out from behind the shattered mainmast.

Captain Soren Varg was exactly as the oldest wanted posters showed him: tall, dark-haired, sharp-faced, dressed in a privateer’s black coat. But the storm shone through half his body. His right hand faded into mist at the wrist. Where his heart should have been, there was an empty hollow beneath a soaked white shirt.

His eyes found the satchel at my hip.

“You brought it back,” he said.

His voice was not a ghost’s whisper. It was a man’s voice, low and furious and almost alive.

I bared my lamprey teeth.

“I came to learn why you keep calling me.”

The heart beat once, hard enough to bruise.

Soren looked at me as if he had been waiting twenty-one years to answer.

“Because,” he said, “you never asked who hired you to drown me.”