Turn 8 of 9

Pull the key back out and go ask Yrenne about the marks on the lockplate

You pull the key back. The lockplate clicks — a small, dry sound of disappointment, or of patience resetting itself — and the keyhole darkens as though something behind it has closed an eye. You stand in the east corridor with the iron key in your fist and the warmth of the wall fading from your palm, and you make a choice that is not caution and is not courage but something in between: you turn around and climb back up.

The stairwell feels different ascending a second time, as though the tower has noted your hesitation and adjusted its opinion accordingly. The hum beneath the glass shifts pitch — lower, more deliberate, the sound of a held breath that has been held so long it has forgotten how to release. You pass the fourth-floor landing, the third, the second, and each flight is a little colder than the last, the black glass walls giving back your reflection in fragments that do not quite assemble into a whole person. By the time you reach the topmost workroom, your fingers are stiff and the key has gone from cold to genuinely painful, a weight of iron that seems to be pulling heat out of your blood.

Yrenne is still at the bench, but she has stopped grinding. The mortar sits before her, and her hands rest on either side of it, and she is looking at the door — your door, the one you just walked through — with an expression you have never seen on her face. Not surprise. Not irritation. Something closer to the look a surgeon gives a patient who has gotten up from the table mid-operation: a mixture of concern and professional assessment, as though she is calculating what has been damaged and what can still be salvaged.

"You came back," she says. It is not a question, and it is not a rebuke. It is a measurement, the way a ruler is a measurement — flat, precise, and capable of cutting.

"The lockplate has marks. Nine of them. I couldn't read them, and the fifth is cut deeper than the rest."

"I know what it has."

She turns back to the bench, and for a moment you think she is dismissing you again, but she picks up the pestle and turns it in her fingers, and the turning is slow, considered, the gesture of someone choosing how much to give away. The not-water sits in its bowl at the edge of the bench, and its surface is still, and it is not looking at you, and the not-looking is deliberate.

"I cut those marks forty years ago," Yrenne says. "When I built the first door. They are not letters — they are a sequence, a kind of argument written in a language that does not have words. Each mark corresponds to a room, and each room corresponds to a piece of what you will need when you return to the bowl. The fifth mark is deepest because the fifth room is the one that costs the most." She sets the pestle down.

"I did not tell you to understand the lockplate before you began. I told you to begin. Understanding will come from the rooms, not from me. If I explain the marks, I will be giving you the answers to questions you have not yet learned to ask, and the eighth apprentice is proof of what happens when you receive answers before you earn them."

She looks at you, and her eyes are dark and steady, and the thing behind them — the thing that might be apology or appetite — is closer to the surface now.

"Go back. Put the key in the lock. Open the first door. And when you understand what the marks mean, you will not need to ask me."

You stand in the workroom, and the key is cold in your hand, and the bowl of not-water is three feet from your elbow, and Yrenne has already turned back to her mortar, and the conversation is over. The pestle resumes its grinding, and the sound fills the room like a heartbeat, and you are dismissed again — not unkindly, but completely, the way a door closes. Behind you, in the corner near the window, Cassiel is standing where they were not standing a moment ago, and their dark eyes are on you, and their expression is the one you can never read: patient, watchful, something that might be encouragement and might be hunger.

You descend. The tower's hum follows you down, and this time it is louder, or you are more attuned to it, and the key in your pocket has warmed slightly — not to the temperature of your body, but to something between, as though it is negotiating, as though it is deciding whether to cooperate. The east corridor is where you left it: short, familiar, wrong. The door is there. The keyhole waits. The nine marks on the lockplate gleam faintly in the tallow light, and the fifth one is deepest, and Yrenne has told you nothing you did not already know, except that she built this forty years ago, and the fifth room costs the most, and she will not save you from the cost.

You slide the key into the lock. This time you do not hesitate. The iron slides home, and the teeth find their corresponding marks, and the lock turns with a sound that is not a click but a note — a single, clear tone that resonates through the glass walls and up through your arm and into your chest, and the door swings inward on hinges that do not creak, and the first room is dark, and warm, and waiting, and it is not empty.

You step through.

---

The first room is not large. It is the size of a modest study, with walls of the same black glass, but the glass here is different — it is not flat. It curves, very slightly, the way the inside of a shell curves, and the effect is disorienting, as though the room is larger than its dimensions and you are standing at the center of something that is listening to itself. There is no lamp, but the room is not dark. The glass itself holds a faint luminescence, a deep blue-grey glow that comes from no source you can identify, and in this light you can see that the walls are not blank. They are covered — floor to ceiling, corner to corner — with handwriting. Not Yrenne's hand. Not Cassiel's. A hand you do not know, writing in the same unreadable script as the marks on the lockplate, and the writing is dense and layered, some of it written over other writ