First period was American History.

  Mr. Delaney liked to begin every class with the same phrase.

  "History," he would say, leaning against the edge of his desk with the lazy confidence of a man who believed civilization followed neat patterns, "is really just the story of consequences."

  That morning he wrote CAUSE AND EFFECT across the whiteboard in thick black marker.

  Then he turned around and froze.

  Every student in the room had already seen the news.

  Phones buzzed beneath desks. Whispered conversations died the moment he looked up. Someone near the windows had the school website open on their laptop—an emergency banner across the top in red letters.

  Student Death Investigation Ongoing

  Mr. Delaney stared at the screen for a moment, then at the class.

  His eyes moved across the room slowly.

  They stopped when they reached me.

  Teachers at Redwood Hills had perfected a particular look over the years. Not accusation. Not sympathy. Something more complicated than both. The look people gave you when they wanted to pretend neutrality while quietly calculating the safest position to stand.

  "Take your seats," he said finally.

  Nobody moved for a few seconds.

  Then chairs scraped.

  Books opened.

  Normalcy returned the way it always did—awkwardly, artificially, like a stage set hurriedly rebuilt after an explosion.

  I sat in the back row.

  The photograph burned in my pocket.

  Madison Blake sat three seats ahead of me.

  Her posture was rigid, shoulders straight, eyes fixed on the board as if memorizing dates from the Civil War mattered more than the girl who used to run the hallways beside her.

  But she hadn't stopped glancing toward the door.

  Waiting for someone.

  Or expecting someone.

  Mr. Delaney cleared his throat.

  "As I was saying," he continued, forcing calm into his voice, "history is a chain of consequences."

  He wrote ACTION → REACTION under the first phrase.

  "Empires collapse, wars begin, revolutions happen because of choices people make."

  The marker squeaked across the board.

  "Every event," he said, "has a cause."

  A quiet laugh escaped my throat.

  It was soft.

  But in a silent classroom, soft carried.

  Mr. Delaney turned.

  "Something funny, Ethan?"

  "Just thinking about consequences."

  "And?"

  "Sometimes they take a while to show up."

  The class shifted uncomfortably.

  Mr. Delaney's mouth tightened.

  "Let's try to keep the discussion academic."

  "Yes, sir."

  He turned back to the board.

  Madison twisted slightly in her seat.

  Her voice came low enough that only I could hear it.

  "You need to shut up."

  I leaned back in my chair.

  "Why?"

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  "Because everyone already thinks you did it."

  "Do you?"

  Her jaw flexed.

  "Olivia had enemies," she said.

  "That's true."

  "But you were the one who reported her."

  "And?"

  "And you humiliated her."

  I watched the back of her head for a moment.

  "Madison," I said quietly, "did Olivia ever tell you what she kept on that phone?"

  She froze.

  Just for a fraction of a second.

  Then she turned slowly.

  "What phone?"

  "Exactly."

  Her eyes sharpened.

  "You're playing a dangerous game."

  "I thought we were talking about history."

  "People like you always think they're smarter than they are."

  "People like you always think nobody notices."

  The bell rang.

  Mr. Delaney's lecture ended mid-sentence.

  Students rushed toward the door with the restless energy of people desperate to escape a room full of tension.

  Madison stood.

  "Stay away from me," she said without looking back.

  I didn't answer.

  Because I wasn't interested in Madison Blake anymore.

  I was interested in the fence behind the science building.

  The place Olivia had called Death Tunnel.

  Redwood Hills High sat on almost forty acres of land.

  Most of it looked immaculate—football fields trimmed to military precision, tennis courts shining under new paint, glass walkways connecting modern academic buildings.

  But behind the old science wing, the campus changed.

  The pavement cracked.

  The grass grew uneven.

  And the security fence that surrounded the property sagged slightly where the ground dipped toward the forest.

  That was where the gap was.

  Students had discovered it years ago.

  A section where the metal links had been cut and bent back just enough for someone to squeeze through.

  Administration had tried to fix it once.

  Students had cut it open again within a week.

  They eventually stopped pretending to repair it.

  Instead, they stopped installing cameras nearby.

  It was easier that way.

  No cameras meant no incidents to report.

  No incidents meant no problems.

  That was how Redwood Hills handled most things.

  I reached the science building just as second period started.

  The back corridor was empty.

  Sunlight slanted through the tall windows and stretched across the floor like pale water.

  Outside, the fence waited at the edge of the trees.

  The opening was exactly where I remembered it.

  Two feet wide.

  Just enough.

  The ground around it had turned to mud from last night's rain.

  Footprints covered the area.

  Some old.

  Some fresh.

  I crouched down.

  Most of the impressions were ordinary sneaker prints.

  But one stood out.

  A narrow heel.

  Boots.

  Small size.

  Probably a woman.

  I stood slowly.

  A voice came from behind me.

  "You shouldn't be back here."

  I turned.

  Officer Julia Park leaned against the corner of the building.

  Hands in her coat pockets.

  Watching.

  "How long have you been there?" I asked.

  "Long enough."

  "Following me?"

  "Observing."

  "That sounds healthier."

  She stepped closer.

  Her gaze dropped briefly to the muddy ground near the fence.

  "You know what this place is?"

  "Students call it Death Tunnel."

  "That's not what the school calls it."

  "The school doesn't call anything what it really is."

  She studied the cut fence.

  "Kids sneak out through here?"

  "Sometimes."

  "And sometimes they bring people here."

  "Sometimes."

  "Like Lily Lin."

  The name hung between us.

  "You think she disappeared through here," Park said.

  "I think a lot of things."

  "Such as?"

  "That nobody looked very hard."

  Park crouched near the fence.

  She touched the mud lightly.

  Then looked at her fingertips.

  "Boot prints," she said.

  "Small."

  "Probably female."

  "Yes."

  She stood again.

  "You came here because of that message, didn't you?"

  I didn't answer.

  Her eyes narrowed slightly.

  "Ethan," she said, "someone is manipulating you."

  "Maybe."

  "And maybe you're manipulating us."

  "That's also possible."

  She exhaled.

  "You're seventeen."

  "And?"

  "And this situation is getting dangerous."

  I glanced toward the forest beyond the fence.

  Tall pines swayed gently in the wind.

  The trees swallowed sound quickly.

  Someone could stand twenty yards inside and watch the school all day without anyone noticing.

  "That depends on who started it," I said.

  Park followed my gaze.

  "Did Olivia meet someone here last night?"

  "No."

  "How do you know?"

  "Because she met me somewhere else."

  "Where?"

  "The east lot."

  "That's where she died."

  "Yes."

  Park studied me again.

  "You're leaving something out."

  "Probably."

  Before she could respond, footsteps echoed from the building.

  Detective Harris appeared around the corner.

  He looked annoyed.

  "Julia."

  She straightened.

  "Harris."

  He glanced at the fence.

  Then at me.

  "You two having a field trip?"

  "Just looking," Park said.

  "At what?"

  "The place students disappear."

  Harris's expression darkened slightly.

  "We already checked the perimeter."

  "You didn't check this."

  "I checked enough."

  He turned to me.

  "You're not supposed to be wandering around campus during an investigation."

  "School policy or police policy?"

  "Both."

  "I'll keep that in mind."

  He looked like he wanted to say more.

  Instead he pointed toward the main building.

  "Get back to class."

  I started walking.

  After a few steps I heard Harris speak quietly behind me.

  "What do you think?"

  Park answered after a pause.

  "I think someone used that fence recently."

  "You think he did it?"

  "I think he knows more than he's telling us."

  Harris grunted.

  "Everyone at that school knows more than they're telling us."

  Their voices faded as I reached the hallway again.

  But one thing stayed with me.

  The boot print.

  Someone had come through the tunnel recently.

  Someone small.

  Someone who knew the blind spots.

  Someone who knew exactly how Redwood Hills hid its secrets.

  My phone vibrated again.

  Another message.

  I didn't stop walking as I read it.

  You're getting closer.

  Then a second message appeared.

  But you're still asking the wrong question.

  I typed back for the first time.

  Then tell me the right one.

  Three dots appeared on the screen.

  Typing.

  Then the reply came.

  Who locked the door?

  I stopped walking.

  The hallway noise blurred around me.

  Locked the door.

  Detective Harris had said Olivia died inside the old locker room.

  Chained from the outside.

  Which meant someone had locked her in.

  But the killer—

  The killer had to leave the scene.

  Unless—

  A cold thought formed slowly in my mind.

  What if the killer never left?

  I turned back toward the science building.

  Toward the fence.

  Toward the forest beyond it.

  Somewhere out there, someone knew the real story.

  And if the message was telling the truth—

  Olivia Carter might not have been the only person in that locker room last night.