The third knot was an inch past the second iron expansion anchor, right where cold groundwater seeped through the lime-washed slate.
Sella Rusk did not need to raise her storm lantern to know it was there. Her right hand, scarred across the knuckles from eight years of Survey boundary work and forty days of hill siege, slid along the tarred hemp cord with the smooth rhythm of a carder running wool through a comb. The cord was stiff with tallow and ditch-grit, strung taut between forged eyebolts drilled four feet above the flagstones. Her callused thumb felt three hard twists: three overhands, snugged down with a fid until the fibers were dense as walnut.
Three knots, the code ran. Clear lateral. Floor graded six inches to the west gutter. No deadfall.
Behind her in the narrow culvert, someone’s iron boot-heel skidded on wet slime. A tin canteen clattered against an ash shovel.
“Pick your feet up, Kip,” Sella said without turning. Her voice was pitched low beneath the rumble of the upper galleries, carrying easily along the stone without waking panic. “You’ve got three inches of ditch-water on the flags and another sixty paces to the sluice junction. Don’t go looking for dry moss where the drainage runs.”
