The first weeks were the hardest. Kit had to learn what it meant to be a guardian, to manage the constant influx of sensory information from the forest. It was like having a thousand new senses all screaming for attention at once.

  The crow—who introduced himself as Morrigan—became her guide. He was a fae creature bound to serve the guardians, though he did so with a healthy dose of sarcasm and complaint.

  'Your grandfather was better at this by now,' Morrigan said as Kit stumbled through the forest, trying to sort out the signals from a distressed oak whose roots were being damaged by erosion.

  'My grandfather had seventy years of practice,' Kit snapped back. 'Give me a break.'

  Still, she learned. She learned to quiet her mind and let the forest speak without overwhelming her. She learned to identify threats—a patch of blight here, a corrupted spring there. She learned to work with the forest's creatures, who were sometimes helpful and sometimes frustratingly cryptic.

  And she learned about the Hollow King.

  Her grandfather's journal had only scratched the surface. The Hollow King had been imprisoned for three hundred years, but he wasn't inactive. He spent every moment of his captivity probing the prison for weaknesses, sending whispers through the cracks, trying to corrupt the forest from within.

  Kit could feel him sometimes, especially late at night when the forest was quiet. A cold presence at the edge of her awareness, patient and malevolent and utterly alien. He didn't think like a human or even like the fae. He thought like an ending, like the space between heartbeats, like the silence after the last note of music fades.

  One month into her guardianship, Kit encountered her first real threat.

  She woke in the middle of the night to a sensation of wrongness so intense it felt like a knife in her gut. Something was attacking the compact's boundaries, trying to break through the wards that kept the prison intact.

  Kit grabbed the iron rifle her grandfather had left—one of the few weapons that could harm fae creatures—and ran into the forest. Morrigan flew ahead, cawing directions.

  They found the breach at one of the Standing Stones. A thing was trying to claw its way through the barrier—a creature made of shadow and hunger, its form constantly shifting and reforming. Where its claws touched the earth, the grass withered and died.

  'Hollow-touched,' Morrigan hissed. 'A victim of the King's corruption. It's trying to break the wards!'

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  Kit raised the rifle, but the creature was too fast. It lunged at her, and she barely managed to roll aside. Its claws raked the ground where she'd been standing, leaving furrows of dead earth.

  Fighting on instinct, Kit reached for the forest's power. It answered immediately, flowing through her like electricity. She thrust out her hand and vines erupted from the earth, wrapping around the creature and holding it in place.

  The thing shrieked and thrashed, its touch withering the vines even as they restrained it. Kit fired the rifle, the iron bullets tearing through the creature's shadowy form. It screamed again, the sound like breaking glass, and then it dissolved into nothing.

  Kit stood panting, her heart racing. The vines retreated back into the earth, leaving her alone in the clearing with Morrigan and the Standing Stone.

  'Well,' Morrigan said after a moment. 'Not bad for your first real threat. Though you used too much power. You'll be exhausted for days.'

  He was right. Kit barely made it back to the cabin before collapsing into bed, where she slept for eighteen hours straight.

  When she woke, she found Morrigan perched on her windowsill.

  'That won't be the last,' he said quietly. 'The King is testing you. Testing the new binding. He wants to know how strong you are, how quickly you tire, how well you can defend the compact.'

  'Can he break free?' Kit asked.

  Morrigan was silent for a long moment. 'If you fail enough times, yes. The prison is only as strong as its guardian. Your grandfather was powerful, but he was also old. The binding weakened in his final years. Now it's your strength that holds the King, and he knows you're untested.'

  'So what do I do?'

  'You get stronger. You learn. You survive.' The crow hopped closer. 'And you accept that this is your life now. There's no going back, Kit. You're the guardian. The only one standing between the world and the hollow.'

  Kit looked out at the forest, feeling its presence like a second heartbeat in her chest. She thought about her old life, already fading into memory. She thought about the years—decades, maybe centuries—stretching ahead of her.

  'Then I'd better get to work,' she said.

  And so began Kit's true education as guardian of the forest. The attacks continued—sometimes hollow-touched creatures, sometimes corrupted spirits, occasionally something stranger and more dangerous. Kit fought them all, growing stronger and more skilled with each encounter.

  She learned to use the forest's power more efficiently, to channel it without exhausting herself. She learned the rhythms of the compact, the ebb and flow of magic through the Standing Stones. She learned which creatures could be trusted and which were secretly working for the King.

  The fae lords visited her regularly, their shadow-forms coalescing in the Heart Wood to check on her progress. They were neither warm nor cold, simply ancient and pragmatic. Kit was a tool to them, a necessary component of the compact. As long as she performed her function, they were satisfied.

  Morrigan, for all his complaints, became something like a friend. He'd served three generations of guardians, he told her, and each had been different. Kit's grandmother had been fierce and uncompromising. Her grandfather had been patient and scholarly. Kit, Morrigan decided, was stubborn.

  'That's not necessarily a compliment,' he said.

  'I'll take it as one anyway,' Kit replied.

  The seasons turned. Kit marked time by the forest's changes rather than any calendar—the budding of spring, the fullness of summer, the harvest of autumn, the sleeping of winter. Each cycle made her feel more deeply connected to the land, more aware of its ancient rhythms.

  But beneath it all, she could feel the Hollow King waiting. Always waiting. Always watching. Always patient.