The lower Blackglass slope sounded like a thousand clay bowls broken beneath an iron roller.
With every stride uphill, the surface scree shifted four inches down. It carried boots and staffs in a slow, grinding hiss. These were not rounded river pebbles or the soft marl of Kilnstep. They were fractured plates of dark rock and fiery melted rock waste, thin as roof slates, shearing over one another with a dry, metal chime that set Kezra’s teeth on edge.
Walking on it was deceitful labor. Planting a heel snapped the plate underneath. Stepping on toes drove upright flakes into boot welts.
Kezra limped the last two hundred paces onto a wind-scoured bench of ash. That kept her weight on the inside of her heel to spare the sliced leather. Her sock was stiff with black fiery silt, sharp as emery powder.
“Halt here,” Paxa Sel said, dropping her wicker pack frame with a hollow thump. She pulled down her wool scarf, her lips chapped white. “Boots off before anyone gathers firewood. I want to see every sole and palm. If black dust works into an open cut overnight, phlegmon will set in before noon tomorrow. I’ll be lancing proud flesh while we freeze on an open crest.”
“The light holds for half an hour,” Fellis said, though he looped the mule’s lead around a stunted ash shrub. “We could make another half-mile.”
“You could make another half-mile toward fever,” Paxa countered. “Look at Venn’s boot. Look at your thumbs. This dust isn’t lime. It’s crushed glass. It doesn’t wash out with tea.”
Kezra didn’t argue. She sank onto a slab of dark rock, unbuckling her gaiters with numb fingers. When she pulled off her left boot, black sand spilled onto the stone. Across the ball of her foot, the linen thread of the welt was cut across six stitches. A thin red scratch scored her skin through the wool.
Paxa knelt before her without ceremony. She splashed boiled water from a tin canteen over the cut. The sting was sudden and bright, biting like cold needlework.
“Clean,” Paxa pronounced, applying a thick smear of yellow sulphur ointment before binding the ball of Kezra’s foot with a strip of boiled cotton. “No glass left in the skin layer. But if you walk another furlong on that broken welt, the entire sole will tear back to the shank. You’ll be hobbling on your bare arch.”
Beside them, Fellis unrolled his cobbler’s kit across a stone. From a canvas pouch, he produced a curved awl with an ash handle, three iron needles, beeswax, braided four-strand hemp, and a thick scrap of bullock rawhide.
“Hand it over,” Fellis said, nodding toward her boot.
Kezra passed him the damaged footwear. Fellis examined the sliced sole, running his thumbnail along the split welt. “Clean cut. A shoemaker in the market would charge two bits of silver and tell you to wait three days. Meanwhile, he soaked it in salt water. We don’t have three days.”
He took the square of bullock rawhide. Then he pressed it against the bottom of her boot, using a sharp crescent knife to trace the curve of the outer sole. With quick, rhythmic thrusts of his awl, he punched a series of slanted holes through both the rawhide patch and the thick edge of the boot’s original leather welt.
“Hold the awl steady while I wax the cord,” Fellis said.
Kezra held the ash grip. Meanwhile, he drew the four-strand hemp through the yellow cake of beeswax half a dozen times, coating the fibers until the cord was stiff, water-repellent, and fragrant with honey. Fellis threaded two needles onto opposite ends of the cord and began a double-saddle stitch. His broad hands hauled each loop taut with a dry, leathery squeak.
“My uncle taught me,” Fellis said, bracing the boot against his knee. “He drove timber wagons out of Highcrag. Said stones in the gorge would skin city boots before the horses broke a sweat. A traveler’s world is only as wide as their thread. If stitching holds, you have a road. If it rots, you’re meat on a rock.”
While he worked, Kezra took strips of spare sailcloth and rough rope twine, fashioning high gaiters around her ankles and shins to seal out the razor chips.
“Double-sole the outside edge,” Yseld called, walking in from the rim. “When we hit the high combs tomorrow, the trail slopes thirty degrees east. You’ll be edging on that rim for six hours.”
“I know how to edge a sole, trail master,” Fellis muttered, hauling the knot home. “She can kick an anvil when I’m done.”
Fellis laid the finished boot aside and reached for the measuring cord. The heavy sixteen-pace knotted hemp rope they used to verify boundary lines and interval grades. The outer strands were frayed, uncoupling into white fluff.
“Look at that,” Fellis said. “We dragged it thirty paces across the scree this morning to check the grade. Just thirty paces, and the dark rock sawed the outer mantle like a rasp. If we drag this line tomorrow, it will stretch four inches and snap on the first pull.”
Kezra touched the worn fibers. “In the valley, turf cushions the chain.”
“Here, there’s no turf,” Fellis said. He notched two ash stakes with his knife. “From here to the crest, we suspend the cord. One holds the head stake, one holds the tail. The line hangs clear of the rock. We measure by plumb and tension, not dragging.”
“That takes two pairs of hands for every chain length,” Kezra noted.
“Then we use two pairs of hands,” Fellis said simply. “Better to spend muscle than lose our measure.”
Dusk settled swiftly, turning the Blackglass ridges into towering silhouetted fangs against a violet sky. The heat plummeted with the sudden bite of fiery heights.
Paxa had a small fire going in the lee of a dark rock stone support prop, boiling water for oatcakes and salt pork.
Kezra took an iron tent peg to anchor the canvas shelter. She tapped the head with her iron mallet.
Thunk. Thunk. Clink.
On the third blow, the peg refused to sink. The pushback was not the sharp refusal of solid bedrock, nor the soft drag of clay. It was a firm, elastic rejection that sent a dull shaking through the iron shaft and into her palm.
Kezra knelt on the cold ground, her fingers brushing away the top two inches of loose, dark black glass clinker.
Beneath the scree lay a dense, fine-grained stratum of pale grey stone, so tightly compacted that her iron peg had merely notched its surface. She drew her brass-bound land-mapper’s trowel and scraped back a handspan of the material. It wasn’t dark rock. It was fiery tuff. Consolidated fiery ash, cemented over thousands of winters into an impermeable, level stone floor beneath the shifting talus.
She pressed her palm flat against the grey stone, closing her eyes and letting her class senses open beneath her skin.
The ringing shape of her Plot Mapmaker sense swelled downward through the soil. First the loose, chaotic chatter of the surface scree—two feet of shifting, unstable clinker with zero solid strength. Then, the clean, level boundary of the grey tuff: dense, uniform, and three arm-lengths thick, resting like an ancient floor upon the deeper dark rock core of the mountain.
Third Buried Layer Checked: Compacted Volcanic Tuff.
In her internal ledger, the Reach rank requirements shifted. To advance from Plot to Reach, she needed twelve completed circuits, three ecologies, and four checked distinct buried strata. In Kilnstep, she had logged the deep river-bed clay and the underlying bedded limestone. Now, beneath this barren mountain bench, she had checked the third. Only one more distinct underground layer remained before the load-bearing criteria of Reach were satisfied.
Yet she extended her senses fifty paces north along the bench. Then, tracing the rock layer seam of the tuff, a sudden sour note caught her throat.
The strike of the stone—the level bearing of the rock stratum along the hillside—didn’t follow the natural slope of the mountain. On any honest ridge, sedimentary or fiery layers dipped uniformly with the main grade of the watershed. Here, the grey tuff ran true for thirty paces, and then, at an invisible seam in the hillside, the strike twisted twenty-two degrees to the northeast.
It wasn’t a natural fault slip. A natural fault left crushed veined stone, slickensides, and jagged fracture zones. This boundary was a clean, upright hidden gap, as straight and sharp as if an ancient stonecutter had dropped a weighted drop-line, sawed through sixty feet of mountain rock. Then it rotated the northern block before mortaring it back into the ridge.
“What are you staring at in the dirt, Venn?” Yseld asked, walking over with a cup of hot broth in her hand.
Kezra didn’t look up right away. She ran her fingertips back and forth across the invisible seam beneath the loose clinker.
“The strike of the stone,” Kezra said softly. “It twists. Right here, under this bench. The rock to the south dips eight degrees to the west. The rock fifty paces north dips twelve degrees to the east.”
Yseld took a slow sip of her broth. Her grey eyes reflected the dim orange coals of the cookfire. “Mountains have faults, girl. Earthquakes shake them, frost cracks them.”
“Earthquakes shatter stone,” Kezra countered, looking up into the scout’s weathered face. “They leave crushed rubble and ragged gouges. This seam is straight. It runs on a true bearing of north-northeast, perfectly parallel to the district road chart’s published map points.”
Yseld stood silent for a long moment, the wind tugging at the frayed hem of her traveling cloak. When she spoke, her voice was lower than the mountain breeze.
“Eat your supper, Kezra. Rest your foot. Tomorrow morning, you’ll see where that seam leads.”
They slept rolled in heavy oiled wool beneath the low canvas wedge, the mule tethered between the tent and the rock wall to break the cutting wind. Kezra lay awake for a long while, listening to the dry, metal rattle of the black scree shifting on the slopes above them whenever the night wind gusted across the combs.
At first light on their fifth travel day, Kezra woke to the smell of cold frost and wet iron.
Paxa was already stowing the kettle. Fellis was checking the rawhide wraps on Barnaby’s hooves. But Yseld was nowhere near the tent.
Kezra pulled on her heavy boot. She felt the sturdy stiffness of the new rawhide welt beneath her sole. Then she stepped out onto the bench. She looked up into the grey dawn. She saw the trail master perched forty paces above the camp on a narrow fiery spur that jutted into the empty gorge.
Yseld lifted two fingers to her lips and blew a single, piercing whistle that echoed off the frozen combs.
She was standing with her hooked staff planted in the scree, her hand resting on the weathered crown of a drystone survey cairn. A cairn that, according to every law of geography and mapmaking, had no business standing on this barren spur.