The Phantom River Bend

How long does it take three nervous cavalrymen to smell an open fire?

About three breaths longer than it took Pipu’s belly gears to hit top speed. Beneath my knees, the little terrier was vibrating like a copper kettle on a boil, the runaway mainspring chattering against his brass flank in a frantic, metallic rhythm. If the sergeant outside drew his flint, the dry willow tangle over our heads would go up in a wall of orange flame before my mule could blink.

I reached for my greasy canvas work apron, scooped Pipu up by his scruff, and rolled him into a tight, muffled cylinder.

"Hush, little engine," I whispered into the folds. "Be a quiet loaf of bread, or we both become charcoal."

Pipu let out a muffled whirr-clack through the canvas, kicking two clockwork paws against my ribs. I shoved the swaddled dog between two sacks of dried yams and slid behind the driver's bench of the Gilded Moth.

Twenty paces north, through the screen of drooping willow branches, horse leather creaked.

"Still hear that ticking, Corporal?" the sergeant's voice drifted over the silt ditch, flat and heavy with iron armor.

"Faint, sir. Down in the brush. Sounds like a clockwork igniter. Duke Chukwuebuka's saboteurs used them at the iron mills."

"The five minutes are nearly up," the sergeant grunted. "If nobody crawls out with hands up, signal the lock patrol to bring fire. We burn the whole ditch clean."

I didn't have another minute. I barely had thirty heartbeats.

My fingers found the cold lever of the manual compression pump beneath the Moth’s floorboards. The unpolished river-silt crystal was already locked into the vent carriage, cold and greasy to the touch. Most stage crystals were cut into crisp hexagonal prisms to throw sharp geometry, but this rough river nodule looked like a lump of dried swamp curd. I had never fed it pressurized steam. If it blew the gaskets, the blast would fling brass shrapnel straight into my chest.

I took the ash-wood pump handle in both palms and leaned my weight into it.

Down. Up. Down. Up.

The twin leather pistons hissed softly, drawing pre-warmed vapor from the reservoir beneath the floor. My palms went slick against the polished wood. The needle on the small bronze dial trembled, creeping past two atmospheres, then three. The brass casing gave a tiny, groaning creak that made the hairs on my forearms stand up.

Kishi the mule twitched one long ear back at me, chewing on a mouth of willow peel with supreme indifference.

"Don't judge the tempo, old girl," I muttered under my breath. "I'm working on the melody."

At three and a half atmospheres, I locked the pump arm with the iron catch.

Now came the real gamble. If I simply flooded the ditch with light, the troopers would see three yards of mud, a green wagon, and a terrified lantern-master. An illusion didn't work by blinding the audience; it worked by giving them something they expected to see, right where they weren't looking.

I reached up and unlatched the long brass projection nozzle mounted through the wagon’s side shutter. The barrel pivoted smoothly on its greased swivel ring. I guided the snout between two drooping willow fronds, sighting along the blackened tube toward the opposite bank of the canal.

Across the dark water, eighty yards away, the far bank rose into a steep limestone bluff topped with wild briars. The canal ran straight as a surveyor’s rule along that wall. Nothing was over there except damp rock and river snails.

I slipped my fingers onto the twin brass knurling rings at the throat of the lens carriage.

The primary focusing cylinder held the amber scatter-prism. When I ran my thumb over the outer collar, my nail caught on the hairline crack running across the lower bevel. The cold canal damp had widened the fracture just enough to feel.

"Hold together for sixty seconds, old friend," I murmured to the glass. "Just sixty."

I cracked the secondary steam valve by a hair.

A thin, superheated whisper of vapor hissed through the micro-tubes into the crystal cradle. The reaction was instantaneous.

Inside the housing, the river-silt crystal did not flash ruby or cobalt like the court gems. It flared with a strange, oily pearlescence, a dense milky glow that seemed to drink the ambient shadow rather than cast it away. Through the sight aperture, I watched the beam shoot across the water.

It didn't look like a beam of light. It looked like a creeping bank of cold, luminous river fog.

Here was where stagecraft took over from luck. A flat wall of mist would make any cavalryman suspicious. Fog didn't roll off a limestone cliff on a windless morning. It needed depth, drift, and a reason to be there.

I tilted the secondary concave mirror downward with my left index finger, offsetting the aperture plate until the refraction caught the low updraft skimming over the canal water. By ear, I balanced the valve hiss against the natural lap of the current. The beam scattered across the base of the limestone bluff, bending the gray dawn light into a hollow false perspective.

Where there was solid rock, the projected mist carved out a deep, black notch in the cliffside.

To anyone standing on our side of the canal, it no longer looked like an unbroken wall of stone. It looked like an inlet: a hidden feeder branch cutting behind the bluff, complete with the sluggish swirl of dark water curling around a bend that wasn't there.

"Look at that," I whispered.

The unpolished river-silt crystal had a natural dampness in its lattice. Instead of burning through the canal vapor, it married with it, magnifying the natural water-haze until the fake inlet acquired physical weight.

I gave the brass dial a quarter turn to the right, introducing a flicker from the carriage's flint-spark wheel.

A single pinprick of dirty amber light bobbed into existence deep inside the phantom inlet. It swayed with the rhythmic dip of a pole-skiff being shoved through shallow water, accompanied by the shadowy silhouette of two men hunched over muffled oars.

"Sergeant!" the corporal called out, his voice sharp with alarm. "Look across the cut! Over at the base of the bluff!"

The heavy tramp of cavalry boots stopped abruptly on the towpath.

"What is that?" the sergeant barked. "There’s no canal branch on the surveyor’s grid at mile three!"

"Look at the water, sir! There's a hidden sluice cut right into the limestone! And someone's moving a flatboat through it. Look at that lantern!"

"Rebel skirmishers," the sergeant snarled, the rattle of a carbine hammer being drawn back echoing across the water. "Chukwuebuka's infiltrators bypassing the Willow Bridge! Mount up!"

"What about the ditch here, Sergeant? The clockwork trap?"

"Forget the ditch! It’s probably a spent fuse left to slow us down! If that skiff gets past the bluffs, they'll flank the vanguard caissons at the lower locks! Into the saddle! Move!"

Three pairs of iron stirrups jingled. Leather slapped against horseflesh. A loud shout cracked the morning stillness, followed by the violent churn of heavy hooves striking gravel. The three troopers wheeled their mounts, spurring them north, back toward the narrows where the timber bridge crossed to the eastern bank.

The thunder of their galloping mounts faded down the towpath, swallowed by the morning mist.

I stood frozen against the Moth’s bench, counting fifty slow heartbeats while the hoofbeats died away into absolute silence.

Only then did I reach for the master cutoff valve.

I twisted the bronze wheel shut, cutting the steam feed to the nozzle. Across the canal, the phantom inlet, the bobbing amber lantern, and the dark water-bend dissolved in a soft puff of dispersing gray mist, leaving behind nothing but the cold limestone cliff and a few startled waterfowl.

I blew out a long breath that rattled against my teeth. "We did it, Pipu. A whole river branch out of half a cup of boiled water."

From inside the canvas roll beneath the bench, Pipu let out a muffled wheeze.

Before I could unwrap him, a sharp, crystalline ping sounded from the heart of the brass nozzle.

My stomach dropped.

I swung the housing open. A wisp of bitter, scorched-oil steam curled out into the cold air.

At the center of the carriage, the amber scatter-prism sat crooked in its brass clamps. The hairline fracture had split straight down the center. One neat half of the crystal remained clamped in the housing, while the triangular lower bevel had tumbled loose, resting against the dark, unpolished river stone.

I picked up the loose fragment between two trembling fingers. The fracture was clean, sheared by the sudden thermal drop between pressurized steam and morning frost.

The river-silt crystal had saved our skins, but the Moth was down its widest focusing eye. Without that prism, my projector couldn't cast anything broader than a needle-thin spear of light.

Behind me, Pipu kicked his way out of the apron, his little brass snout poking into the open tool drawer as if looking for the grease rag.

I looked down at the two halves of amber in my palm, then out toward the empty towpath.

"Well, dog," I said softly, pocketing the shards. "Looks like we have some gluing to do before sunrise."