If Barrowfield High had a personality, it would be a substitute teacher who hasn’t learned anyone’s name and keeps calling everyone ‘champ’. The building was a stack of odd decisions—an auditorium that echoed like a cave, a science wing that smelled like hot pennies, and a library on the third floor because someone once said books should be closer to the ideas. I liked the library anyway. It had a rolling ladder that made a creak like a polite violin, and it had Ms Campo, a librarian who could shush a storm cloud. When she hired me as a student aide for the autumn—‘because you alphabetise like a machine and ask too many questions’—she handed me a laminated card of rules. The font was nice. The rules were not. 1. Do not ring the small silver bell on the desk. 2. Do not shelve the blue atlas. 3. Do not feed the catalogue. ‘I feel like three is a metaphor,’ I said, reading them aloud while Malik sprawled in a beanbag behind me like a retired starfish. Ms Campo pushed her glasses up and peered over them. ‘I’m very literal, Zadie. And I’m leaving you two to inventory after hours because the trivia team begged for a quiet place to cram. Lock up when you’re done. No one else should be on this floor.’ She glanced at Malik, who was rotating a pencil through all its existential phases. ‘And absolutely do not ring the bell.’ ‘What happens if I ring the bell?’ I asked, because of course I did. ‘You will be disappointed in your choices,’ she said, and then vanished between Reference and Romance like she’d always had that exit planned. Malik rolled over and sat up. ‘We are absolutely ringing the bell.’ ‘We are absolutely not,’ I said, because half my personality is telling Malik no and the other half is him doing things anyway. It was Tuesday, the worst day to do anything, and the entire school was in a mood. The AC had been stuck on ‘arctic tundra’ since July, and the fluorescent lights hummed like bees with opinions. Outside, the track team’s boombox kept trying to play the same chorus and giving up. Inside, Malik and I had set up a fortress at the back tables, a mountain of textbooks and highlighters and snacks we weren’t technically allowed to have. The trivia team tournament was in four days, and we’d decided to attempt the unthinkable: actually prepare. ‘I’m telling you,’ Malik said, flipping through a book of obscure capital cities, ‘they’re going to ask about something like the Finnish concept of *sisu*, and I’m going to have to win us the trophy with vibes.’ ‘Vibes have a 30% success rate in this weather,’ I said. ‘Also, your pencil is dead.’ He glanced down at the shredded stump in his hand. ‘It lived a full life.’ He reached for another and discovered his entire pencil pouch was a graveyard. ‘You ever think about how pencils are just trees we train to do our homework?’ ‘Can we train them to also pass geometry?’ We settled into a rhythm—me scanning barcodes, Malik asking increasingly unhinged questions like, ‘How many tangerines is too many tangerines for one sitting? Hypothetically.’ The library had its usual night sounds: the HVAC sighing in the vents, the old bronze clock announcing time in grumpy ticks, the rolling ladder occasionally shifting, even though no one was on it. The carpet was the exact colour of an optimistic bruise. Every time I looked up, the rows of stacks looked a fraction closer than I remembered them, as if they were listening in. At 8:13 p.m., after Malik had consumed a heroic number of contraband tangerines and declared them ‘study oranges’, he wandered to the main desk and stared at the small silver bell with a single raised eyebrow. ‘No,’ I said without looking up. He tapped it with the gentleness of a butterfly. The bell made no sound. He tapped it harder. Still nothing. He shook it. Silence. Malik gave the bell a look usually reserved for unresponsive technology and betrayal. ‘See?’ I said. ‘Disappointed in your choices.’ ‘Maybe it’s a metaphorical bell,’ he said. ‘Like, ring it in your heart.’ I opened my mouth to tell him what my heart was ringing and then the rolling ladder moved. It didn’t creak, which is how I know it moved on purpose. It slid, polite as a cat, all the way along the track on the east wall and settled beside the atlas section, as if called. Malik and I did that thing where you look at a moving object and convince yourself it’s the wind, and then you remember you’re inside. ‘You saw that, right?’ he said. ‘Define “saw”,’ I said, already heading toward it because curiosity is a disease and I never got vaccinated. The atlas section lived under a bank of narrow windows, the kind that let in a slice of dusky sky and nothing of the view. The shelf was full of maps that weighed as much as a mid-sized dog. In the middle was space—exactly the width of the ladder—where the shelves didn’t quite meet. If I leaned in, I could see the wall behind them, pale and scuffed with old tape and the ghost outlines of previous arrangements. Except it wasn’t a wall. It was a door. A door I had never seen before. A door that had the audacity to have a sign taped to it that said simply: *Basement.* ‘Very funny,’ I said to the world at large. ‘We’re on the third floor.’ ‘Maybe the building identifies as taller,’ Malik said, because he is unhelpful in times of architectural crisis. The door wasn’t old; it wasn’t new. It was the kind of institutional beige that’s applied to things people want you to ignore. It had a latch, a black metal handle, and no keyhole. My stomach did a small gymnastic routine. ‘We should not,’ I said, even as I grabbed the handle. ‘I agree,’ Malik said, stepping onto the ladder beside me, the tangerine smell radiating like a citrus aura. The handle turned. The door opened. Beyond it: a narrow stairwell that didn’t belong to any part of Barrowfield High I’d ever seen, lit by a string of exposed bulbs that hummed individually, as if they each had their own grudge. The air that drifted up was cool and papery and tasted like the inside of a book that had opinions about you. I looked at Malik. He looked at me. We shared the exact same thought and said it at the exact same time. ‘We’re definitely going down there,’ we said, in the tone of people who know better. We stepped off the ladder and onto the stairs before I could finish listing all the reasons this was a bad idea. My phone had two bars and a battery percentage that made me feel reckless. The steps were solid under our feet, concrete painted a practical grey that had been scuffed by a lot of shoes. The walls had the kind of handrails that hoped no one would use them. Halfway down, there was a detour sign: an arrow pointing left that someone had drawn a smiley face on, and under it, in tidy script, the words: *Returns this way.* ‘Returns for what?’ Malik whispered. ‘Everything,’ I whispered back, because it felt like the kind of place where you whisper back to the air. At the bottom of the stairs, the world opened into a room that could have been any back-of-house anywhere. The fluorescent lights were newer down here, their hum more caffeinated, their light a clean white that made us look like ghosts. There was a desk, the exact twin of the one upstairs but with a glass bell jar sitting on it like it was protecting the concept of dust. Behind the desk was a book drop chute that curved into the wall like a metal tongue. On the wall, a neon sign flickered: OPEN. It wasn’t plugged into anything. ‘Wow,’ Malik said softly. ‘Welcome to the library for people who keep secrets.’ ‘Don’t use that line on college essays,’ I said, even as my chest did the thing where it tightens and your body decides everything is a drum. There was one other thing: a manila envelope on the desk addressed in block letters to: *ZADIE JIN.* My name has never looked so much like a bad decision. ‘I don’t love that,’ I said. ‘I love that for us,’ Malik said, because he is powered entirely by chaos. I broke the seal. Inside was a plastic card, library-card size, with my name and a barcode and the words *ACCESS: ARCHIVE — LEVEL B.* The card was warm, as if it had just been in someone’s pocket. ‘Do you think this is like a membership rewards thing?’ Malik asked. ‘Do we get a free tote after ten existential crises?’ There was a thump behind the wall, faint but distinct, like a book the size of an idea dropping into a bin. I nearly swallowed my own tongue. We both turned to the chute at the same time. ‘Something just—’ I started. ‘—returned itself,’ Malik finished. Before either of us could come up with a plan for what to do when the furniture starts participating in your evening, I noticed the blue atlas. It sat on a stand to the left of the desk like a rumour, its cover the deep colour of a midnight lake. A thin paper tag stuck out from its pages, hand-lettered: *DO NOT SHELVE.* ‘Which is technically not shelving if we open it,’ Malik said. ‘I hate how compelling your logic is,’ I said, but my hands were already on the cover. The leather was warm under my fingers, almost too warm, like it had been soaking up sunlight somewhere that wasn’t here. We opened to the marked page. It wasn’t a map of the world. It wasn’t a map I had seen in any atlas ever. It was a map of here. Not just a floor plan—the breathing, twitching schematic of the room we were in, drawn in ink that glimmered when it caught the light, with labels that shifted as if they were correcting themselves. The desk was a neat rectangle labelled DESK, the chute a curve with a mouth labelled RETURNS. Near the bottom left, a dot pulsed red. *NEXT TO ATLAS,* it said. The dot had a tiny label floating above it: *ZADIE.* My skin decided to have Opinions. A second dot blinked into existence near the stairs, pulsing a slower beat. *MALIK,* it read, and then added politely: *PLEASE DON’T TOUCH ANYTHING.* A third dot blinked on in the hallway outside the room. It had no name at first, just a steady, unhurried pulse. Then the ink wobbled and settled, and a label appeared: *INCOMING.* We both stared at the page, and the page stared back in the way only paper can, silently judgemental and a little amused. Another thump sounded from somewhere above, closer this time, like footsteps in a hollow place. The neon OPEN sign hiccuped and then burned brighter. The little glass bell jar on the desk fogged from the inside and cleared, as if something had breathed on it. ‘Okay,’ Malik said thinly. ‘Do we like “incoming”?’ ‘I don’t even like outgoing,’ I said, and reached for my phone. No service now. The bars had left the building. Great. The bell on the upstairs desk had been silent when we tried it. Down here, there was a bell I hadn’t noticed before, a small silver twin resting on the corner of the desk, carved with initials I couldn’t make out. As we watched, it trembled. Just a little. Like something had tapped it from a long way away. It chimed once. The note hung in the air as if reluctant to leave. It chimed twice. The fluorescent lights clicked in sympathy. It chimed a third time. The book drop shuddered, a little rattle working its way along the hidden metal. Ink on the atlas shivered and the *INCOMING* dot began to move, sliding along the hallway line toward the door with terrible calm. ‘Whatever is doing that is very confident,’ Malik said, his voice higher and friendlier than he felt. ‘Confident people terrify me,’ I said, because jokes are the only life preserver I own. The door we’d come through—sturdy beige, unbothered by our panic—had a black handle on this side too. It moved. Just a nudge. Just enough to show it could. The neon sign hiccuped again and held. The bell chimed a fourth time, sharp as the tip of a question. The *INCOMING* dot reached the threshold line on the page and paused, right there. Waiting. There was a scrape in the chute, metal on metal, a sound like patience running out. Malik grabbed my sleeve. My mouth went dry. The handle turned, slow, deliberate, like a clock hand deciding to be late. We had one breath to decide whether to run or pretend to be furniture. The door began to open.