The storm broke at dawn.

I stood at the porthole in Kael's quarters, watching the first pale light struggle through thinning clouds. The sea still heaved, restless and dark, but the worst had passed. Behind me, I could hear Kael moving—the rustle of clothing, the creak of leather as he pulled on his boots.

We hadn't spoken since my warning. Since his promise.

"The crew will need me," he said finally.

"I know."

"You should stay here. Rest."

I turned to face him. He was already dressed, his hair still damp from the basin, that leather cord keeping it tied back. The scar on his jaw seemed more pronounced in the gray morning light. He looked exhausted. Haunted.

He also wouldn't quite meet my eyes.

"Kael—"

"We'll talk later." His voice carried the weight of command, the captain's authority he'd set aside during the storm. "When things are secure."

Translation: when he'd had time to think. To decide what to do about me.

I nodded, throat tight.

He paused at the door, one hand on the frame. For a moment I thought he might say something else. Might cross back to me and finish what we'd started last night.

Instead he left without another word.

I stood there in his shirt, surrounded by his scent, and tried not to think about the fact that everything was about to fall apart.

Twenty-five days.

Twenty-five fucking days.

---

I changed back into my own clothes, braided my hair, and tried to look like someone who hadn't spent the night tangled up with her captain. The storm had left its mark on the ship—I could hear the crew shouting, the thud of feet on deck, the general chaos of damage assessment.

I should go help. Should play my part as the competent sailor who'd earned her place aboard.

But my hands were shaking too badly to tie knots.

The truth was coming. I'd warned him, yes, but warnings didn't change what I'd done. What I still had to do.

Unless—

I sat down hard on Kael's bed, mind racing.

What if I told Thessa I'd failed? That the artifact was too well-guarded, that Kael suspected me, that I couldn't complete the mission?

She'd send someone else. Someone without my inconvenient human sympathies. Someone who'd kill the entire crew without hesitation if it meant retrieving the artifact.

What if I told Kael everything now? Confessed before he discovered the truth on his own?

And said what, exactly? Surprise, I'm a siren sent to steal from you, but I've caught feelings so maybe we can work something out?

He'd throw me overboard. Or worse.

The scent of jasmine was getting stronger—my control slipping. I forced myself to breathe slowly, to calm the panic rising in my chest.

There had to be a way through this. Had to be.

I just couldn't see it yet.

---

Bones found me an hour later.

I was on deck, coiling rope with hands that had finally stopped trembling. The first mate appeared at my elbow like a ghost, his gray hair wind-whipped, his expression unreadable.

"Captain wants to see you."

My stomach dropped. "Now?"

"Now."

I set down the rope carefully, aware of the other crew members watching. Bones's tone had been neutral, but there was something in his eyes. Something that made the hair on the back of my neck rise.

He knew.

Not what I was, maybe. But that something was wrong.

I followed him below deck, through passages still damp from the storm. We passed the crew quarters, the galley, the storage holds. Kept going deeper into the ship's belly.

Toward the captain's private storage.

Toward the place Kael had forbidden anyone to enter without his express permission.

"Bones—"

"Quiet."

We stopped at a reinforced door. Bones knocked twice, and I heard the bolt slide back from the inside.

Kael stood in the doorway, backlit by lamplight. His expression was carefully blank, but I could see the tension in his shoulders. The muscle jumping in his jaw.

"Come in, Maris."

It wasn't a request.

I stepped past him into a small, windowless room. The air was colder here, and wrong somehow—charged with a sensation that made my teeth ache. Like the pressure before lightning strikes.

Bones didn't follow. The door closed behind me with a finality that felt like a tomb sealing.

"Kael, what—"

Then I saw it.

---

The artifact sat on a table in the center of the room, and every instinct I possessed screamed at me to run.

It was beautiful. Terrible. Wrong.

A crystal the size of a human heart, pulsing with faint bioluminescent light. The color shifted as I watched—deep blue to green to silver, like light through water. But it wasn't the light that made my skin crawl.

It was the sense of life trapped inside.

"Do you know what it is?"

Kael's voice came from behind me. I couldn't look away from the artifact.

"No," I whispered. But I was lying.

I'd seen drawings of it in the deep caves where the elders kept their histories. Had heard the stories told in the dark water, warnings passed down through generations.

The Traitor's Heart.

"I think you do." Kael moved to stand beside me, close enough that I could feel his body heat. Close enough to smell leather and amber and something sharper—fear. "I've been watching your face."

The artifact pulsed, and I felt an answering pull deep in my chest. Like recognizing like.

"It killed my brother," Kael continued, his voice carefully controlled. "Finn touched it, and it... consumed him. Drained the life right out of him in seconds. He died screaming."

I closed my eyes. "I'm sorry."

"Our mother was a sailor. Died when we were young. We never knew much about her family—she'd been estranged from them. But after Finn died, I did some research." He paused. "Found some interesting stories. About sailors who could hold their breath too long. Who swam too well. Who had eyes that reflected light like a cat's."

My heart was hammering so hard I thought he must hear it.

"Stories about women who lured ships to their doom. Who sang men into the water and dragged them down to drown."

"Kael—"

"Look at it, Maris."

I forced myself to open my eyes. The artifact was pulsing faster now, brighter. Responding to my presence.

"I stole this from a collector who didn't know what he had," Kael said. "Thought it was just a pretty crystal. But I felt it the moment I touched it—knew it was something more. Something dangerous." His voice dropped. "Something that recognized Finn's blood."

The temperature in the room was dropping. I could see my breath now.

"It's a siren's heart," Kael said quietly. "Isn't it? Crystallized. Preserved. Still alive somehow."

I couldn't speak. Couldn't breathe.

"I've spent six months trying to figure out how to destroy it. But everything I've read says it can only be unmade by the same magic that created it." He turned to face me fully. "By a siren."

The artifact flared brilliant blue-green, and I felt it pulling at something deep inside me. At the part of myself I kept carefully locked away.

At my true nature.

"That's why you're here," I managed. My voice sounded strangled. "You needed—"

"No." The word was sharp. "That's not why you're here. I didn't know what you were until just now." His hand caught my chin, forcing me to meet his eyes. "But you knew. Didn't you? You knew exactly what this was."

The truth was in my face. In the way the artifact sang to me. In the scent of salt spray and jasmine that I could no longer suppress.

"How long have you known what I am?" I whispered.

"About thirty seconds." His thumb traced my jaw, the touch gentle despite the steel in his voice. "The artifact started reacting the moment you entered the room. And your eyes—" He leaned closer. "They're reflecting the light. Just like the stories said."

I jerked back, but he held firm.

"Were you sent to steal it?" His voice was dangerously soft. "Is that why you came aboard? Why you've been lying to me for six months?"

I could lie. Should lie. But I was so tired of the deception. And the artifact was pulling harder now, calling to the part of me that belonged to the deep water and the dark.

"Yes," I said.

He flinched like I'd struck him.

"My matriarch sent me. Thessa Depthcaller." The words spilled out in a rush. "She said the artifact was dangerous. That it needed to be returned to the sirens before humans could use it. That it was my duty to retrieve it."

"And you believed her."

"I had no reason not to." I met his storm-gray eyes. "Until now."

"What changed?"

I gestured at the pulsing crystal. "This. Seeing it. Recognizing what it really is."

"Which is?"

"A punishment." The word tasted like ash. "It's called the Traitor's Heart. Created centuries ago by the siren elders to deal with those of our kind who... who fell in love with humans."

Kael's hand dropped from my face.

"It transforms sirens into humans permanently," I continued. "Strips away our magic, our connection to the sea, everything that makes us what we are. Makes us mortal. Vulnerable." I laughed bitterly. "The ultimate betrayal of our nature."

"So your matriarch wants it back to—"

"To make sure no siren ever uses it willingly." The pieces were falling into place, and I felt sick. "She told me it was dangerous to humans. That you might use it as a weapon against us. But that's not why she wants it."

"She wants to prevent sirens from choosing humanity."

"Yes." I wrapped my arms around myself, suddenly freezing. "And she sent me because she knew I was weak. Knew I had... sympathies. If I succeeded, she got the artifact back. If I failed or was caught—"

"It proved you were compromised."

"Proved that caring about humans was a fatal flaw." I looked at him. "She was testing me. And I failed the moment I started to care about you."

Silence fell between us, broken only by the artifact's pulse. It was so bright now it hurt to look at directly.

"Your brother," I said quietly. "The artifact recognized him because—"

"Because our mother was part siren. Yes." Kael's voice was hollow. "That's why it killed him. He had enough of the blood for it to react, but not enough to survive the transformation."

"I'm so sorry."

"Are you?" He turned those gray eyes on me, and they were full of something that made my chest ache. "Or is that another lie?"

"Everything I've told you since the storm was true," I said desperately. "Everything I feel—"

"How would I know?" His voice cracked. "How would I know what's real and what's just... what? A siren's magic? A predator playing with her food?"

"I don't have that kind of magic." The words came out sharper than I intended. "I can't make you feel things that aren't there. I can sing men into the water, yes, but I can't create emotions from nothing. Can't manufacture—"

"Then what have you been doing to me?" He stepped closer, and I could feel the heat rolling off him. Fury and desire and hurt all tangled together. "Because I haven't been able to think straight since you came aboard. Haven't been able to focus on anything but you. Is that magic or just—"

"I don't know!" The confession burst out of me. "I don't know what this is! I've never felt anything like it!"

The artifact flared brilliant white.

We both stumbled back, shielding our eyes. When the light dimmed, I could see cracks forming in the crystal's surface. Hairline fractures spreading like a spider's web.

"It's reacting to you," Kael said. His voice had gone deadly calm. "To what you are."

"It recognizes me." I could feel it pulling harder now, trying to latch onto my magic. Onto my nature. "Kael, you need to get away from it. If it shatters—"

"What happens if it shatters?"

I thought of the stories. Of sirens who'd been forced to touch the Traitor's Heart and had their magic ripped away in seconds.

"I don't know. Nothing good."

He didn't move. "Can you destroy it?"

"I—maybe. If I can access enough magic. But Kael, I don't know what it will do to me. The transformation works both ways. If I'm not careful—"

"You could become human."

"Or die." I met his eyes. "The stories weren't clear on the details."

The artifact pulsed again, and I felt something crack inside me. Like a wall I'd been holding up for six months finally giving way.

"I should have told you," I whispered. "Should have warned you what I was. But I was afraid you'd—"

"Kill you?"

"Hate me."

The confession hung between us. Kael stared at me, and I watched emotions chase across his face too fast to name. Anger. Betrayal. Hurt.

Want.

God, the wanting was still there. Even now. Even knowing what I was.

"I should throw you overboard," he said quietly.

"Yes."

"Should lock you in the brig until we make port. Hand you over to someone who knows how to deal with your kind."

"Probably."

"Should do anything except stand here wanting to kiss you so badly I can't breathe."

My heart stopped.

Kael took another step closer. The artifact's light painted his face in shifting shades of blue and green, made his eyes look almost luminous.

"Were you sent to kill me too?" His voice was barely above a whisper. "Is that part of the mission?"

"No." The word came out fierce. Certain. "Never. Thessa wants the artifact, not your life."

"But if I got in the way?"

I thought of the matriarch's black pearl eyes. Her casual cruelty. The way she'd sent me on this mission knowing I might not survive it.

"She wouldn't care," I admitted. "About you or your crew. You're human. You don't matter to her."

"But you're not her." His hand came up to cup my face, thumb tracing my cheekbone. "Are you?"

"I don't know what I am anymore."

The truth of it shook me. I'd spent my whole life trying to be a good siren, to suppress my human sympathies, to prove I belonged in the deep water. And I'd spent six months pretending to be human, playing a role, keeping my nature locked away.

But standing here in Kael's quarters, with the artifact singing to my blood and his hand warm against my skin, I didn't feel like either.

I just felt lost.

"Kael—"

The artifact's pulse spiked, and suddenly I couldn't breathe. It was pulling at me, dragging at my magic with hooks I couldn't see. The temperature plummeted, and I heard something crack—not the crystal this time.

Ice.

Ice was forming on the walls, spreading from the artifact in crystalline patterns. The moisture in the air was freezing, my breath coming out in white clouds.

"Maris?" Kael's voice seemed to come from very far away. "What's happening?"

I tried to answer, but the artifact's pull was too strong. It wanted what I was. Wanted to strip away my magic and leave me hollow.

Wanted to transform me.

My knees buckled. Kael caught me, his arms coming around me as the room spun. Through the haze of pain, I could smell him—leather and amber and something warm that anchored me to my body.

"Fight it," he said urgently. "Maris, fight it."

But I didn't know how. The artifact was too strong, too old, too—

Hungry.

That's what it was. Hungry for magic. For transformation. For the chance to fulfill its purpose after centuries of dormancy.

And I'd walked right into its range.

"Get me out," I gasped. "Kael, get me out of this room."

He didn't hesitate. Just swept me up and carried me toward the door, moving fast despite my weight. Behind us, the artifact's light grew blinding, and I heard the crystal crack again.

The door slammed open. Bones was there, his eyes going wide.

"Captain—"

"Move!"

Kael shouldered past him, carrying me down the corridor. Away from the artifact's pull. Away from the cold and the hunger and the terrible, beautiful light.

We made it maybe twenty feet before my vision went dark.

The last thing I felt was Kael's arms tightening around me.

The last thing I heard was him saying my name like a prayer.

Or a curse.