The Unstable Ground

The cedar table between them carried the scars of thirty years of dry seasons, but Himesa was staring at the knuckles of Samizo's right hand where two fingers were set slightly crooked.

"A Yabushi shadow blade carries three short knives and moves on the surface tension of wet rock without clicking a pebble," she said, her voice dry as river gravel. "They train by running across floating reeds from the age of seven. How did an unranked surveyor with eight pounds of slate on his back leave that mill alive?"

Samizo picked up the brass calibration plate and turned it against the yellow light of the oil lamp. "Because assassins, much like temple elders, believe their own poetry. They think because they can leap across twenty feet of empty air without breathing, the rock underneath them cares who their grandfather was."

He set the plate down with a dull clink.

"The Yabushi masters tell their disciples that the Enokawa River is a living dragon that yields to perfect balance. But water is not a dragon. Water is four thousand tons of hydraulic mass looking for the easiest way to crush whatever is underneath it. If you know where the stone is cracked, you do not need to be faster than an assassin. You only need to know when the ceiling is going to fall."

·  ·  ·

Thirty days before the flood surge, the rain over Shiroishi Gorge did not fall straight down. It blew sideways through the gaps in the rotting cedar mill, smelling of pulverized moss and wet sandstone.

Tsuyome did not drop from the rafters with a roar or a flourish of steel. She came down like a tear in the dark.

The first sign Samizo had of her descent was not sound, but the sudden draft of displaced air extinguishing the stub of tallow candle beside his ink slab. In the pitch black of the lower mill floor, a thin whistle cut the damp—the high-frequency hiss of a Yabushi ripple-edge dagger clearing its sharkskin sheath.

Samizo did not draw his iron surveying rod. Trying to duel a Yabushi blade in close quarters with an iron stake was an efficient way to lose both arms before completing a single breath.

Instead, his heels kicked backward into the cedar floor peg he had loosened two hours earlier.

The floorboard tipped on its notched axle. The three wide pine planks beneath his wicker stool dropped into the drainage sluice below, swinging open like trapdoors over the old mill race.

Samizo dropped straight down into the black chute before Tsuyome's dagger could bite his collar.

The blade whistled through the empty air where his throat had been half a heartbeat prior, striking the heavy oak frame with a wet, splintering thud. Above him, a muffled intake of breath signaled her surprise—not because he was skilled, but because no cultivator in the river valleys ever retreated by jumping down a garbage chute.

The sluice was steep, slick with four decades of green algae and rotting wood pulp. Samizo threw his shoulders back, pulling his rattan pack tight against his chest to protect the clay cipher and the stone slates. The pack banged hard against his ribs, knocking the wind from his lungs as he shot down the narrow wooden culvert at bone-breaking speed.

Cold, sulfurous mist slapped his face. The roar of the Enokawa River grew from a distant rumble into a deafening roar that vibrated through his jaw.

He burst out of the timber conduit fifteen paces below the mill foundation, tumbling onto the gravel shelf of the inner gorge. He hit the wet river stones, rolled across the shale rubble, and slammed hard against an ancient drift-log wedged between two boulders. Pain spiked down his left hip, sharp and immediate, but his hands checked the rattan ties on his pack first.

The clay impression was whole. The brass plate was secure.

Behind him, high up where the broken timber conduit jutted from the mossy cliff, a shape detached itself from the gloom.

Tsuyome did not tumble down the chute. She landed on the edge of the rocky ledge with the feather-light whisper of a falling leaf, her balance centered perfectly over the balls of her feet. In the dim moonlight breaking through the rain clouds, her dark hemp traveling coat whipped in the river wind. She held a curved Yabushi skinning blade in her right hand and a three-pronged trench knife in her left. Her breath was steady, her footing firm on the slick, grease-coated river shale.

"Samizo the Surveyor," she said, her voice cutting clean through the drumming roar of the rapids. "My elders gave me three descriptions of you. None of them mentioned you sliding down sewage drains."

Samizo climbed to his feet, using the cedar drift-log to take the weight off his bruised hip. He kept his iron-tipped sighting rod planted in the gravel between his boots.

"Your elders think a river boundary is settled by temple bells and silk ribbons," Samizo said, spitting a mouthful of grit into the spray. "They do not know what the bottom of their own gorge looks like."

"They know you carry an iron-and-brass Gamou plate," Tsuyome said. She took one step forward. Her sandals barely disturbed the surface water pooling over the shale. "And they know you have deciphered the flood gate markers. The Yabushi sect does not permit Gamou hydraulic ciphers to walk freely in the hands of an outcast."

"If you kill me, you will not know where the Gamou are aiming the levee breach," Samizo said evenly.

"I will take your pack," she replied, her eyes tracking the wicker straps across his chest. "Our scribes can read slate as well as you."

"Your scribes do not know how to read the river's throat," Samizo said. "They will read the numbers on the slates, stand in the wrong ditch, and drown twelve thousand of your own tenant farmers when the Gamou blow the sandstone bluff."

Tsuyome's brow tightened, but her blade did not dip an inch. "You speak too much for a dead surveyor."

She moved.

The Yabushi sect trained their assassins in the Surface-Skimming Current art, channeling Surge Resonance through the soles of their feet to float over water tension and frictionless mud. She crossed thirty paces of jagged, wet boulders in three heartbeats, her silhouettes blurring against the spray of the falls.

Samizo did not turn to face her strike. He turned and sprinted down the narrow gravel spit leading into the throat of Shiroishi Gorge.

"Run all you wish," Tsuyome's voice echoed off the sheer canyon walls, cold and directly behind him. "You have ten paces before my steel takes the tendon in your heel."

Samizo did not look back. He kept his eyes glued to the grey slate shelves ahead, his boots hitting the exact stepping points he had paced out during the dry afternoon.

One pace. Two paces. Five paces.

The gorge walls narrowed here, pinching the Enokawa into a violent, churning flume less than twenty paces wide. But it was not the open river that made Shiroishi Gorge deadly; it was what ran beneath the bedrock.

Two centuries of silt buildup had sealed the natural drainage fissures along this lower bend. Underneath the brittle shale crust lay a subterranean siphon—a trapped chamber where river water, forced down through upper fracture faults, gathered immense hydrostatic head against a pocket of pressurized river mud and subterranean steam.

During the afternoon survey, Samizo had noticed the rhythmic pulsing of the spray holes between the boulders. Every eighty heartbeats, the subterranean chamber exhaled, bubbling boiling gray mud through the rock fissures before sucking the water back down.

The Yabushi sect maps marked this entire stretch as solid granite foundation. Their ancient scrolls claimed the gorge was anchored by the bones of an earth dragon.

Samizo knew it was twelve inches of rotting shale sitting over a natural hydraulic bomb.

He counted under his breath. Sixty-four. Sixty-five. Sixty-six.

Behind him, the air shrilled as Tsuyome closed the gap. She leaped from a high boulder, her Yabushi blade tracing a silver arc toward his spine, intending to pin him to the gravel bed.