The city of Navar climbed in terraces above the vast bay, as if thirsty to gaze into the horizon. The streets wrapped around something that was older in it than cobblestones and salt - the backbone of a huge creature tossed by the sea centuries ago. The bones, smoothed by the wind, formed arched vaults and white bridges; fishermen fell asleep in their shadows, and seaweed scented with iodine and dried mint grew in their crevices. At the highest, where the wind's breath was widest, the Library of Bones thrust itself into the sky. Mara, a young archivist, had worked there for three years and had learned to listen to the building's buzz. It didn't sound like glass or metal, it sounded like a shell - if you put your ear to the circle, you could hear the residual singing of the sea. She liked these sounds. She timed with them instead of with a watch, because clocks could not stand the humidity here - they blew leather strip by strip, and the hands stuck in place like magic. That day, later than usual, she was left with two overdue drawers to sort out and one window to close. The window looked straight out onto the bay, and the wind pressed in like a curious child. Mara adjusted her shawl, slipped her notepad into her pocket and reached for a folder that was thickened from old stamps. She knew every smell of the place - parchment dust, lamp grease, salt and ink - but there was still something new and sweeter hanging in the air, as if someone had dragged a finger over candied orange peel. - I'll be late, if I know life,' she muttered to herself, as she had an appointment with Janek. The cartographer Nawar, a vagabond with steely eyes and a crooked smile, sometimes brought maps here that wanted to draw themselves, and sometimes ones that escaped to the edge of the table and had to be caught like chicks. - But he probably likes to wait. - She smiled, because there was always a certain note of play in that waiting. Janek turned up without knocking, pushed through the wind like a leaf at the door. His shoes were scuffed with salt, his jacket was scratched with chalk and there were specks of gold pigment sticking out from under his fingernails. - 'I had a baker's dog scandal on my way to you,' he said, hooking his jacket on a hook. - He regarded my bag as competition for the loaves. He almost won. - He picked up the canvas bag and shook it. - But the prey survived. Mara was used to his freedom among the bones and drawers. She commemorated in the margins how he moved between the bookcases - silently, as if talking to the library space for breaths and pauses. - What is it this time? - She asked, tucking a strand of hair behind her ear. - Something I didn't want to leave for later. - He opened the bag and pulled out a roll of parchment, tied with a simple rope. - This was brought to me by a fisherman from the north. He had found it in a box of old moorings and anchor stones. He claimed the paper was warm on the inside, as if someone had just held it in their hands. Mara dielectrically, almost piously, untied the line. In the Bone Library, parchments were sometimes capricious - some opened only by lantern light, others disliked loud words and became dull when shouted. This one opened without resistance, but when she unrolled it, instead of the familiar paths and markings, she saw a network of lines and spots that rippled like a sheet of water. The lines were not in ink - they shone thinly, as if sketched with a thread of moonlight. - He's alive,' she said quietly before she could stop herself. Janek measured her with his eyes, with that half-smile of his reserved for moments when they both recognised something without words. - Or pretending to be alive. - He moved the lantern closer. - See: it reacts to heat. The parchment took in the heat of the flame like skin - the lines began to clump together, to diverge, and for a moment an outline emerged in the middle of them - like a cross-section of something in depth, like a spiral. Mara held her air. Her hands, aware of the archival rigour, twitched but did not tremble. - 'The last time I saw tide charts drawn like this was when the sea was doing something that didn't fit the calendar,' she muttered. - 'But this... this looks like a building plan. - What kind of building? Silence, counted in the soft crackle of the lamp, answered them. The room suddenly became very quiet, as if someone had dropped a heavy anchor chain on the floor and all the rest of the sound had congealed under its weight. Mara raised her eyes and her gaze met John's. - 'Today is Breathless Tides,' she reminded, more to herself than to him. - A day when the bells are silent and the harbour comes to rest. Nonetheless, somewhere far away - and at the same time, as if in the middle of the bones, in the columns of the library - there sounded a single ringing of a bell. Deafening, round, without the echo that should, after all, reverberate through the vaults and reading rooms. Mara felt the sound pass through her, as if along the spine of her left hand. The parchment responded. The lines stopped rippling haphazardly and began to arrange themselves into something intelligible: a plan that Mara knew as well as a map of her own mornings. And yet there appeared corridors she didn't know, mezzanines that defied any logic, and staircases going up into the bone-white where a wall was always a wall. At one such passageway, just off the twenty-seventh vertebrae of the Underfloor Reading Room, a word blossomed - not scrawled in the usual alphabet, yet legible, as if lifted from dreamlike letters: "Mara". - 'I don't like things calling me by name,' she replied dryly, but her voice stuck in her throat. Janek turned the parchment over, as if expecting to find a signature, a joke, an explanation. Nothing. The bell struck a second time. This time it thundered closer, not from the tower outside, but from inside the bones. Bindings rustled on the bookcases, and specks of light settled into the dust, as if someone had blown into the tissue between the world and the world. Mara reached for the lantern and wordlessly moved down towards the circles and kidneys of the library, as the lowest halls were jokingly called by those who spent too much time here. Janek followed her without slamming the parchment shut - the blinds of glistening lines shifted to match their steps. The way down led through a narrow staircase, set between the teeth of one of the great circles. The bone was as cool as the stone of a well. Threads of lanky algae hung from the ceiling - tiny dots shone in some of them, as if someone had inadvertently seeded stars into the damp darkness. The twenty-seventh room was quieter than usual; the air stood still, although it should have been stirred by the difference in temperature from the lanterns. - 'There's never been a passage here,' whispered Mara. She was not speaking to John, but to the library, with that tenderness one leaves to those closest to one. The parchment darkened at the edges, as if both the heat of the lantern and the tension in their backs had gathered. The line slid out in front of them like a ribbon and stopped at the white bone wall. Where there should have been only a smooth curve, an oval indentation grew, barely discernible - a trace of something that had not been touched for a long time. The indentation was shaped not like a key, not like a hand, but like a wave of sound. - 'A bell,' said Janek, as if explaining to himself. - Or its echo. A third time the bell rang out without a sound, more in the bones than in the air. The indentation trembled and began to expand, like cracking ice. A chill with the smell of snow and resin blew from inside, from a place that could not exist. Mara remembered the smell, though she had never been further than the North Beach - she remembered it from the stories Beethoven had told about the mountains that Navar did not have. - 'We don't have to go in,' said Janek quietly, standing so that the lantern did not cast a harsh light into the opening. - I know,' she replied. - 'We can. A whisper came from inside the hole, not a word, but a kind of trilling of the air. It was neither hostile nor friendly, just aware. The parchment in Jan's hands shrank like a living thing and let out one single mark, with such gentleness that it hurt: a spiral into which a thin notation was woven - a sequence of notes or waves from which the sea began. Mara held out her hand. The bone just inside the entrance pulsed slightly, measuring her pulse with its pulse. The lantern flicked, as if the flame wanted to turn and look first. Behind their backs, the quiet dripping of condensation suddenly folded into a rhythm that had not been there before. Janek pressed the parchment to the edge of the hole. The lines of the drawing began to wind around the inside, as if the map were not so much showing the way as being part of the hinge itself. On the other side, something moved - very slowly, like a shadow that finally realised it was in the light. - Can you hear it? - Mara asked. - I can hear. - Janek didn't take his eyes off the opening. - It's like... turning pages. Only that someone is turning them in our memory. For a fraction of a second, Mara saw something that was not a picture, more a gesture of a picture: a corridor embroidered with light, endless, and at the end of it... a gentle blue that had never been in this library. She still had time to think that this was what dawn on a foreign river smelled like. A drop fell and splashed against her skin, cold as a nail. The bell rang for the fourth time, not from the tower, not from the bones, but as if from inside an opening. Simultaneously, upstairs somewhere on one of the upper floors, something heavy rustled, like a sliding wardrobe or a bookcase changing hands. The lantern light hit the edge of the indentation and a long shadow - not theirs, not anyone else's - scrolled down the wall opposite. Mara tightened her fingers on the cold skeleton. She felt everything - the sea, the bones, the paper and their breaths - converge on a single point, which was that waveform of sound. And then - before they had time to take a step - someone's name whispered from across the threshold, unlike any of their own, yet answered by both their hearts at once.