Turn 7 of 9

Examine the door and the wall more closely first

You do not put the key in yet. You crouch, and the glass is warm under your fingertips — not the warmth of sunlight through a window, but deeper, circulatory, as though the wall has a temperature the way a body has a temperature. The discolouration around the doorframe is not stain or shadow. It is a difference in the glass itself, a darkness that goes all the way through, and when you press your thumbnail against it, the surface gives with a faint resilience that is nothing like the cold, hard glass you have been polishing for nine years. This part of the wall is softer. Older. As though the tower grew this frame first and hardened around it.

The keyhole is set into a plate of tarnished metal that is not iron and not brass — something between the two, with a dull grain that catches light differently from every angle. You bring the tallow lamp from its bracket and hold it close, and in the yellow glow you can see faint marks around the keyhole's edge. Not scratches. Letters. Cut into the metal plate with a tool so fine that the strokes are nearly invisible, worn nearly smooth by years of nothing touching them. You cannot read the script — it is not the common alphabet Yrenne uses for her labels, nor the angular notation she uses for her formulae. But you count the marks, and there are nine of them, spaced evenly around the keyhole's circumference, and the fifth one is deeper than the others, cut harder, as though the hand that made it hesitated or bore down.

You run your palm along the wall beside the frame, and the surface changes again. Not in texture, but in sound — the hum beneath your hand shifts pitch as you move, dropping lower near the hinges and rising near the keyhole, a gradient of vibration that maps the door's architecture the way a pulse maps a heartbeat. This is not a wall with a door in it. This is a door with a wall built around it, and the wall is holding the door the way a body holds a breath — contained, pressurized, waiting for permission to exhale. The glass has been shaped around this opening with the kind of patience that is not human, and you realize with a slow, cold certainty that the tower did not grow this door for you. It grew it for Yrenne, decades ago, when she was younger and the glass was softer and she was building something she has not finished.

You stand and step back. The corridor is short and empty and familiar, and it has been familiar for nine years, and the door has been here for longer than that — hidden in plain sight, not by magic but by the limits of what you were permitted to see. You were not ready. Perhaps you are not ready now. But the key is in your hand, and its teeth are the negative space of the keyhole's marks, and the ninth letter on the plate corresponds to the ninth notch on the key's blade, and the fifth notch is deeper than the others, and you understand without being told that this is not a lock that keeps people out. It is a lock that waits for someone to come in, and it has been waiting, and the waiting is almost over.

The hum rises. You slide the key into the lock.