The Iron Throat

The iron rungs of the vertical ladder were rimed in white needle-frost that bit straight through the leather of Kaelen’s gloves. Within the hollow spine, the chimney draft was a living current, falling from the high ramparts in a dry, frozen rush that carried the smell of old soot and mountain snow. Below them, forty feet of sheer granite dropped into blackness, broken only by the narrow headers of the bypass flues and the faint, upward drift of grease-smoke from the lower works.

"Step on the joints," Kaelen said softly, his voice muffled by the high collar of his dark velvet doublet. He held the ladder with one hand and braced Lyra’s waist with the other, his boots finding purchase where the iron rods met the mortared stone. "The centers are pitted with sulfur. If one shears beneath your weight, don't reach for the masonry."

Lyra did not answer with words, only a tightening of her grip on the next rung up. Her skirts were pinned back against her hips to keep them clear of the corroded struts, but every reach upward pulled against the linen of her bodice, where the hearth-anchor burned with fierce, unyielding heat. The skin of her chest felt scorched, a dry fever thrumming in step with her racing pulse. Each time the subterranean resonance stirred far below in the citadel's roots—where the sealed southern vault pulled against the Ember covenant—the metal beneath her stays answered in a white-hot spasm that left her teeth clenched and her ribs aching.

"I have my footing," she whispered, though her breath misted white and ragged in the draft.

Then the whistle came.

It was a small, high shriek—brass screaming into the narrow chimney from two landings below. The note did not die away; it bounded from one ashlar face to the next, magnifying within the stone cylinder until the entire shaft hummed like an overtuned wire.

For an instant, neither of them moved. Lyra froze with one foot poised on a frost-slick iron bar, her knuckles blanching where her fingers hooked over the next rung.

"He found the wool," she murmured, her voice tight against the throb in her sternum.

"Keep climbing," Kaelen said, his gloved fingers digging into the wool of her waist-cinch to drive her upward. "He cannot climb and blow the signal at once. Move, Lyra."

Below, the rhythmic scrape and clink of iron-shod boots struck the ladder with rapid, purposeful strikes. Benen was ascending with the haste of a junior bailiff who knew his signal had been heard. Farther down, answering shouts filtered into the base of the flue—Morvath’s bailiffs scattering through the scullery corridors, their iron-cleated boots ringing upon the flags as the hounds bayed at the draft louvers.

Lyra forced her aching body upward, ignoring the searing friction where the anchor pressed against her ribs. The radiant heat was bleeding through her linen now, casting a faint, rose-colored sheen against the frosted mortar inches from her nose. She lunged for the next rung, her slipper slipping an inch on rime before catching against the riser.