The first rule of mapping the Underreach is simple: never trust a floor you haven’t sounded.

I’d sounded this one. Three taps of the iron-shod staff, a long listen, a fourth tap for luck. The rock had answered solid and dull, the way good limestone does. Then I took two steps forward to mark the junction on my chart, and the world opened its mouth and swallowed me.

There’s no dignity in falling. I’d always imagined that if the deep finally took me, I’d go with some poetry — a last clever thought, a name on my lips. Instead I screamed like a kicked goat, lost my lamp in the first second, and spent the rest of the drop clutching my chart case to my chest as if paper could break bones on my behalf.

I hit something soft. Then something hard. Then something that gave and tore, like wet canvas, and dumped me into a sloping chute that went on far longer than any chute has a right to.

When I finally stopped, I lay very still and took inventory, the way my mother taught me before she ever let me near a cave.

Head: ringing, but attached. Arms: scraped raw, working. Ribs: complaining loudly. Left ankle: a hot, sullen throb that promised to become a problem the moment I asked it to hold my weight. Chart case: still strapped across my body, still latched.

I breathed out. Alive, then. Alive and lost and very, very deep.

The second rule of the Underreach is that the dark down here isn’t empty. It’s simply waiting for you to stop moving.

I fumbled at my belt for the spare light, a stub of glowstone wrapped in waxed cloth. My fingers were shaking too hard to work the knot. I bit through it instead, peeled the cloth back, and let the pale green light spill out over my hands.

Then I looked up, and forgot to be afraid for a full three heartbeats, because I had never seen anything so beautiful in my life.

The walls were alive.

Not rock. Not quite. They curved up and away from me in smooth, ribbed vaults, layered like the inside of a seashell and glossed like honey poured over amber. Faint gold light pulsed somewhere beneath the surface, slow and steady, a heartbeat seen through skin. Hexagonal cells honeycombed the higher reaches, hundreds of them, then thousands, rising into a darkness my little glowstone couldn’t touch.

And the air hummed.

I felt it before I heard it — a low, endless thrum in my teeth and in the soft places behind my knees. It wasn’t a sound so much as a pressure. It rose and fell like breath. Underneath it ran something thinner and sweeter, almost a melody, though it frayed at the edges as if the singer was tired.

The smell reached me last. Warm wax. Crushed green stems. Something darker beneath, musky and resinous, that went straight past my nose and settled low in my belly like a swallow of brandy.

I’d read about hives. Every cartographer in the Guild has read the old reports — the half-mad accounts of deep crews who came back babbling about singing walls and golden halls. We laughed about them in the taverns. We called them honey-drunk.

Nobody had ever come back with a map.

My hands were already moving. That’s the trouble with me, as three different expedition leaders have put it in writing: Wren Halloway would chart her own funeral if you gave her a clean sheet. I eased the case open, slid out a fresh page and my charcoal, and began to sketch the chamber’s curve by glowstone light — the vault, the cell-tiers, the chute I’d come down, the three tunnel mouths leading away.

I’d got as far as the second tunnel when the humming stopped.

It didn’t fade. It simply ended, all at once, the way birdsong stops in a forest when a hawk passes over. The silence that rushed in after was so complete that I heard my own blood.

I didn’t move. I didn’t breathe.

Something shifted in the dark beyond the third tunnel. A dry, deliberate whisper of a sound — the rasp of something hard and smooth sliding over stone. Then a click. Then a series of clicks, rapid and layered, like someone running a knife along the teeth of a comb.

I closed the chart case very slowly. I tucked the glowstone against my chest so its light pooled small. My ankle screamed when I drew my knees under me, and I bit the inside of my cheek until I tasted copper.

Run, said every sensible part of me.

Where, asked the rest.

The clicking stopped. The scent changed.

That’s the only way I can describe it. The musk in the air thickened and sharpened, like a hand closing into a fist. My skin prickled from my scalp to my heels. The swallow-of-brandy warmth in my belly turned hot.

And he stepped out of the tunnel.

I’d like to say I saw him clearly at once. I didn’t. My mind kept trying to fit him into shapes it already knew — a man in armour, a man on stilts, a beetle the size of a horse — and failing at each.

He was tall. Taller than any man I’d met, perhaps seven feet, and built long and narrow at the waist, broad across the shoulders. He was armoured — no, he was armour: overlapping plates of chitin, black shading to deep bronze at the edges, gleaming wherever the gold light from the walls touched him. His torso was close enough to human that my eyes kept insisting on it. Then they’d snag on the second pair of arms folded tight against his ribs beneath the first, or the fine, dark seams where plates met, or the shimmer of something gossamer folded flat along his back.

Wings, I realised. Folded wings.

His face undid me most. It was nearly a man’s face — high cheekbones, a hard jaw, a straight severe mouth — carved from the same burnished chitin as the rest of him. But his eyes were wide and faceted and black, catching my small green light in a thousand points. From his brow rose two long, feathered antennae, sweeping back and up, and they were moving. Tasting the air.

Tasting me.

He tilted his head. It was such a birdlike, curious motion that a hysterical little laugh escaped me before I could stop it.

The antennae flicked forward.

“I’m not—” My voice cracked. I swallowed and tried again. “I’m not here to steal anything. I fell. Up there.” I pointed at the chute, absurdly, as if he might nod and say ah, the chute, of course. “I’m a cartographer. I make maps. I’m not a threat to you. To your—” I gestured at the walls. “Home.”

He came closer. He didn’t walk the way a man walks. Every movement was smooth and economical, weight flowing from one long leg to the next without a wasted inch. The faint click of his feet on the floor was the only sound in the world.

He stopped an arm’s length away. Then he crouched, folding down with an ease that made my aching body jealous, until his strange face was level with mine.

This close, his scent was overwhelming. Resin and smoke and something like the air before a storm. My pulse stumbled.

His antennae reached out.

I flinched, and he went utterly still. The feathered tips hovered a finger’s width from my cheek. He waited.

He was waiting.

I don’t know why that, of everything, was what loosened the knot in my chest. Perhaps because nothing in the Underreach had ever waited for me before. I held my breath and gave the smallest nod.

The antennae touched my face.

They were softer than I expected — like the down on a moth’s wing, like a brush loaded with warm water. They traced the line of my cheekbone. My temple. The shell of my ear, which made me shiver. They swept down my jaw and paused at the corner of my mouth, and there they lingered, trembling faintly, as if listening to my lips instead of my words.

I felt a strange pressure behind my eyes. A sense of being read.

Then he drew back, and spoke.

“Map-maker.”

The word came out of him in a low, resonant rasp, with a faint double tone beneath it, as if two voices were speaking slightly out of step. It was my own language. Rough and careful, the vowels pressed into unfamiliar shapes. But mine.

I stared. “You—how do you—”

“You carry your words on your breath.” His mouth moved oddly around the sounds, testing them. “I tasted them.”

“You tasted them.”

“Mm.” The antennae flicked. If I hadn’t known better, I’d have said he looked faintly smug. “You are loud, map-maker. Loud in your mouth. Loud in your scent. The whole of the eastern reach heard you fall.”

Heat climbed my neck. “I wasn’t planning on it.”

“No.” His faceted gaze moved over me, slow and thorough, and stopped at my ankle. Something in his posture sharpened. “You are hurt.”

“It’s nothing. A sprain.”

He reached out with one of his lower hands — four long fingers, each tipped with a dark, smooth claw — and pressed very lightly against the swelling above my boot.

I made a sound I’m not proud of.

“Nothing,” he repeated, flatly, and I’d swear it was mockery.

“Who are you?” I demanded, mostly so I wouldn’t cry.

He considered the question as though it were strange. Then he pressed one upper hand flat against his chest plate.

The sound he made wasn’t a word. It was a click, a hum, and a soft breathy rasp, layered together into something that went through me like the plucked string of a harp. The scent around him bloomed at the same moment — warmer, deeper, unmistakably him.

I tried to repeat it. What came out was a strangled cough.

The antennae twitched. “Kesh,” he offered. “Your mouth can carry that.”

“Kesh.” I tried it on my tongue. It fit oddly well. “I’m Wren.”

“Wren.” He said it slowly, with that double tone underneath, and I felt it in the soles of my feet. “A small brown bird. Very loud.”

“How do you even know what—”

“It was in the taste.”

I opened my mouth. Shut it again. It seemed unwise to ask what else had been in the taste.

Kesh rose to his full height in one fluid motion, and suddenly I was very aware of how small I was on the floor at his feet. The gold light from the walls caught the edges of his plates and set them burning.

“You cannot stay here,” he said. “The outer reach is not safe for soft things.”

“Then show me the way up and I’ll be out of your—”

“No.”

The word landed like a dropped stone.

“No?”

“You fell into the hive, little bird. Through the hive’s own skin.” One antenna flicked toward the torn membrane high in the chute, and for the first time I understood that the wet-canvas thing I’d ripped through on the way down had been wall. Living wall. “What falls into the hive belongs to the hive until the Queen says otherwise.”

A chill slid down my spine that had nothing to do with the cave. “The Queen.”

“She will want to see you.” A pause, something unreadable crossing that carved face. “She already knows you are here. She has known since you began to bleed.”

I looked down at my scraped forearms, the thin beads of red, and swallowed hard. “And if I refuse?”

Kesh regarded me for a long moment. Then he bent, and before I could do more than squawk, he scooped me off the floor.

He did it with all four arms. Two beneath my back and knees, one braced across my hip, the fourth cupping the back of my head as if I were something that might crack. He lifted me against the broad, warm plane of his chest as easily as I’d lift my chart case.

He was warm. I hadn’t expected that. Warm and smooth and humming faintly, a deep vibration I felt through my ribs and down into my bones.

“Put me down—”

“You cannot walk.”

“I can limp—”

“Slowly. Loudly. Bleeding.” His antennae dipped to brush my hair, and my traitor body shivered against him. “There are things in the outer reach that are not as patient as me, Wren. Be still.”

I should have kept fighting. I know that. Some proper Guild cartographer, the kind they write ballads about, would have drawn her belt knife and made a desperate stand.

But my ankle was on fire, and my ribs were aching, and his scent was all around me now — thick and warm and heavy as a blanket. It seeped into my lungs. It loosened my muscles one by one. The panic in my chest didn’t vanish so much as go quiet and far away, like a storm heard through stone.

That’s when I realised what he was doing.

“Stop that,” I said, with as much force as I could gather.

His stride faltered. “Stop what?”

“The smell. Whatever you’re doing. It’s—” I flapped a hand weakly at the air. “It’s making me calm. I don’t want to be calm. I want to be appropriately terrified.”

Kesh stopped walking altogether.

He looked down at me with those vast, faceted eyes, and for a long moment I couldn’t read anything in them at all. Then, slowly, the heavy sweetness in the air thinned. Drew back. Faded, until all that was left was the faint resinous smoke of him and the wax-and-honey breath of the walls.

My fear came flooding back, sharp and cold and entirely my own.

I didn’t know whether to thank him.

“Better?” he asked. There was something in the double tone of his voice now. Curiosity, maybe. Or respect.

“Yes,” I said, and my voice only shook a little. “Thank you.”

He made a soft clicking sound, deep in his chest. Then he began to walk again — into the third tunnel, into the dark, into the deep belly of the hive.

The humming started up around us as we went. Low at first, then building, wall to wall, cell to cell, until the whole passage thrummed with it. The gold light brightened in our wake as if the hive itself were waking to look at me.

And beneath the hum, threaded through it, I heard the song again. That thin, sweet, fraying melody.

Closer now. Clearer.

It sounded like a woman singing in a language I’d never learned — and somehow, impossibly, it sounded like she was singing to me.

Kesh’s arms tightened around me.

“She is awake,” he murmured, and I couldn’t tell whether the tremor in his voice was reverence or warning. “Hold on to your loud little heart, map-maker.”

The tunnel opened ahead of us into a blaze of molten gold.

“You are about to meet your Queen.”