A Pilot's Tide Reckoning

A dogeared notebook in Doreth Sumb's hand, folded into thirds and tucked under a stone at the Causeway Rest — the Sunken Stair Road's crossing-windows in terse notation.

Scratched in charcoal on salt-stiffened vellum: window notations for each of the Stair Road's seven drowned spans, the flood-current speed at the narrows, and a single marginal note that reads 'second span bares forty minutes after the first — do not trust the gap in the cloudy season.' Referenced entities: place.sunken-stair-road, place.causeway-rest, character.doreth-sumb, concept.the-drowned-road.