The helicopter cut through the Siberian sky, its rotors a rhythmic thunder that seemed to echo the beating of Silas’s heart. Below, the landscape had transformed from the green of the Altai foothills to a vast, white expanse that stretched to every horizon. The permafrost was a frozen ocean, cracked and broken in places, dotted with the dark shapes of ancient larches that had survived for centuries in the thin, cold air. Clara sat beside him, her face pressed to the window, her breath fogging the glass. She had been quiet since they left Börte’s cave, her mind turning over the words of binding, memorizing them in case Silas needed her to speak them. The psychic connection between them hummed with a low, constant vibration, a thread of awareness that bound them together across the noise and distance. Tenzin sat in the jump seat across from them, his eyes closed, his lips moving in a silent prayer. He had been meditating since they lifted off, his staff resting across his knees, the bones and stones that hung from it clicking softly with the helicopter’s vibrations. “How much longer?” Silas asked, his voice cutting through the noise. The pilot, a grizzled Russian named Yuri who had been hired by Marcus for his knowledge of the region, glanced back. “Two hours. Maybe less. The weather is holding, but there’s a storm building over the Arctic. We’ll need to be quick.” “We will be.” Silas turned back to the window, his eyes scanning the white expanse below. Somewhere out there, buried beneath the ice and snow, was the Ice Heart. Börte had given them coordinates, marked on an ancient map that showed the topography of the region before the last ice age. The threshold was hidden in a valley that had been carved by glaciers, a place where the boundary between worlds was thin. Clara’s hand found his, her fingers cold but steady. “What are you thinking?” “I’m thinking about Katerina. About what she must have felt, choosing to bind herself to that entity. She was afraid of death. She wanted immortality. But at what cost?” “She’s been alone for a century. Preserved in ice, trapped in a threshold, waiting for someone to come. That’s not immortality. That’s a prison.” “And her brother wants to wake her. He thinks he’s saving her, but he’s really just unleashing something that should stay buried.” Clara squeezed his hand. “We won’t let that happen.” Silas looked at her, at the determination in her eyes, the strength that had grown in her since they first met. She was no longer the quiet librarian from Vermont, uncertain and afraid. She was a warrior, forged in the fires of the past months. And he loved her for it. The thought struck him like a physical blow. Love. He had been so focused on survival, on the mission, on the weight of the Aethelred legacy, that he hadn’t allowed himself to fully acknowledge what he felt for her. But now, as they flew toward the heart of the cold, toward a battle that could end everything, he let the feeling wash over him. “Clara,” he said, his voice barely audible over the rotors. She turned to him, her eyes searching his face. “Yes?” “When this is over—if we survive—I want to build something with you. A life. A future.” Her breath caught, and for a moment, the world seemed to stop. The helicopter, the ice, the mission—all of it faded into the background. There was only her, and the warmth in her eyes, and the smile that spread across her face. “I’d like that,” she said. “I’d like that very much.” He leaned forward and kissed her, a gentle, tender kiss that tasted of salt and promise. When they pulled apart, the world rushed back in, but it felt different now. Lighter. As if the future was no longer just a distant hope, but something they could reach out and touch. Tenzin opened his eyes and smiled. “It is good to have something to fight for, beyond survival.” “It is,” Silas agreed. The helicopter flew on, eating up the miles of frozen wilderness. The sky grew darker, the clouds thickening on the horizon. The storm that Yuri had warned about was building, a wall of white that loomed like a sentinel. “We’re coming up on the coordinates,” Yuri called back. “But I don’t see anything. Just ice and rock.” Silas leaned forward, peering through the windshield. Below, the landscape was a jumble of frozen ridges and valleys, the ice cracked and broken in places. There was no sign of a cave, no entrance to a threshold. Just the endless white. “Set us down on that ridge,” Silas said, pointing to a flat expanse of rock that jutted out from the ice. “We’ll go the rest of the way on foot.” Yuri nodded and began the descent. The helicopter touched down with a jolt, the skids sinking slightly into the snow. Silas unbuckled his harness and grabbed his pack, the weight of the climbing gear and supplies a familiar comfort. They stepped out into the cold, and it hit them like a wall. The wind was sharp, carrying tiny ice crystals that stung the skin. The temperature was well below freezing, and the air was so thin that every breath felt like a struggle. “This way,” Tenzin said, his voice muffled by the scarf he had wrapped around his face. He set off across the ice, his staff tapping against the frozen ground, his steps sure and steady. Silas and Clara followed, their boots crunching on the snow. The ridge sloped downward, leading into a narrow valley that was sheltered from the worst of the wind. The walls of the valley were sheer rock, black and ancient, streaked with veins of white ice. Tenzin stopped at a point where the valley narrowed to a cleft, a dark slit in the rock that seemed to swallow the light. “Here,” he said. “The entrance to the Ice Heart.” Silas stepped forward, peering into the darkness. The cleft was narrow, barely wide enough for a single person to pass. A cold draft emanated from it, carrying a smell that was ancient and metallic. “This is it,” Silas said. “The threshold.” Clara moved to stand beside him, her hand on his arm. “I can feel it. The psychic connection—it’s pulsing. There’s something down there. Something old.” “The entity,” Tenzin confirmed. “It knows we’re here.” Silas took a deep breath, the cold air burning his lungs. He reached into his pack and pulled out a small flashlight, clicking it on. The beam cut through the darkness, revealing a tunnel that sloped downward, its walls covered in frost and ice. “Stay close,” he said. “And don’t touch anything.” He stepped into the cleft, the rock walls pressing in on either side. The tunnel twisted and turned, descending deeper into the earth. The temperature dropped with every step, until Silas’s breath came out in clouds of white. The ice on the walls began to glow with a faint, blue light, as if the cold itself was alive. They walked for what felt like hours, the silence broken only by the crunch of their boots and the distant drip of melting ice. The tunnel opened into a vast cavern, the ceiling lost in darkness above. In the center of the cavern was a lake of ice, perfectly smooth and transparent, its surface reflecting the blue glow like a mirror. And in the center of the lake, suspended in the ice, was a woman. She was beautiful, her features frozen in a state of eternal youth. Her hair was dark, spread around her head like a halo. Her eyes were closed, her hands folded across her chest. She wore a dress of white silk, embroidered with silver thread, and a crown of ice rested on her brow. Katerina Volkov. Silas approached the edge of the lake, his breath catching in his throat. The ice was so clear that he could see every detail of her face, the delicate curve of her lips, the long lashes that rested on her cheeks. She looked like a sleeping princess, waiting for a prince to wake her with a kiss. But there was nothing romantic about this. She was a warden, a collaborator, a woman who had made a deal with an ancient evil. And her brother was coming to free her. “The words,” Clara said, her voice echoing in the cavern. “You need to speak them now.” Silas nodded, his heart pounding in his chest. He opened his mouth to begin the incantation, but before he could speak, a voice echoed through the cavern. “So, you found it.” Silas spun around. Viktor Volkov stood at the entrance to the tunnel, a gun in his hand, his eyes cold and triumphant. Behind him, a dozen armed men fanned out, their weapons trained on Silas and the others. “Volkov,” Silas said, his voice tight. “I should have known you’d be here.” “Did you think I would let you destroy my sister? Did you think I would let you collapse the threshold and trap her forever?” Volkov stepped forward, his boots echoing on the ice. “I have been waiting for this moment for decades. And now, with your bloodline’s resonance, I will wake her.” “You’re a fool,” Clara said, her voice sharp. “Katerina made a deal with the entity. She’s not a prisoner—she’s the warden. If you wake her, you’ll unleash something that can’t be controlled.” “You don’t understand. My sister and I, we have been working toward this since we were children. The Volkov family has always known about the thresholds. We have always known about the entities. And we have always known that the Aethelred bloodline was the key to controlling them.” “You’re wrong,” Silas said. “The bloodline doesn’t control the entities. It opens doors. And once they’re open, they can’t be closed.” “Then we will learn to close them.” Volkov raised his gun, aiming it at Silas’s chest. “But first, I need your blood.” Silas felt the words of binding rising in his throat, ready to be spoken. But before he could utter them, Volkov fired. The bullet struck Silas in the shoulder, spinning him around. He fell to the ice, his vision swimming. Clara screamed, rushing to his side, but Volkov’s men grabbed her, pulling her back. “No!” Silas shouted, his voice raw. “I don’t want to kill you,” Volkov said, stepping closer. “I just need your blood. A few drops will be enough to wake Katerina. After that, you can die however you like.” He knelt beside Silas, pulling a syringe from his coat. Silas struggled, but the pain in his shoulder was blinding, his strength draining away. He watched as Volkov pressed the needle to his arm, drawing blood. The syringe filled with crimson, and Volkov stood, a triumphant smile on his face. He walked to the edge of the ice lake, holding the syringe above the surface. “Katerina,” he said, his voice reverent. “Your brother has come for you. Wake up.” He pressed the plunger, and the blood fell onto the ice. The cavern shook. The ice lake cracked, a deep, resonant boom that echoed through the chamber. The blue glow intensified, and the temperature plummeted. Silas watched, helpless, as the ice began to melt, the cracks spreading like veins across the surface. Katerina Volkov’s eyes opened. They were black, entirely black, with no iris, no pupil. She smiled, her lips curling into a expression that was ancient and predatory. “Brother,” she said, her voice a whisper that carried through the cavern. “You have freed me.” Volkov stepped back, his triumph turning to horror. “Katerina? What’s wrong? Your eyes—” “They are the eyes of the entity,” she said. “The creature I bound myself to. It has been waiting for a century to be released. And now, thanks to you, it has a vessel.” She raised her hand, and the ice shattered. A wave of cold energy exploded outward, throwing Volkov and his men across the cavern. Silas clutched his shoulder, trying to stand, but the pain was too great. Clara broke free from her captors and ran to him, her hands pressing against his wound. “Silas! You need to speak the words! Now!” “I can’t,” he gasped. “The blood—he took my blood. The resonance is gone.” “No,” she said, her voice fierce. “The words are still in you. The power is still in you. You don’t need the bloodline to collapse the threshold. You just need the will.” Silas looked at her, at the fire in her eyes, the faith she had in him. He thought of the future he wanted to build with her, the life they could have together. He thought of Elena, and the freedom she had found in death. He thought of all the Aethelreds who had come before him, carrying the weight of the bloodline, and he knew that he had to end it. He opened his mouth, and the words of binding came. They poured out of him, ancient and powerful, vibrating through the cavern. Katerina turned, her black eyes fixed on him, and she screamed. “No! You will not seal me!” But Silas did not stop. He spoke the words, the full incantation, his voice growing stronger with each syllable. The cavern shook, the ice cracking and breaking. The blue glow flickered, and the entity within Katerina writhed, trying to break free. Clara joined her voice to his, speaking the words in perfect harmony. The resonance built, a wave of energy that pulsed through the ice, through the rock, through the very fabric of the threshold. And then, with a final, deafening roar, the cavern collapsed. The ice shattered, the walls crumbled, and the world turned to white. Silas felt Clara’s arms around him, felt the warmth of her body against his. And then everything went dark.