Nelli looks as if the sea has sanded her down to practical shapes: compact, weather-browned, and always braced slightly forward, even on dry ground. Her dark hair is parted with exact care and bound in a tight coil beneath a knitted cap, though salt has left pale, stiff flecks along the loose wisps at her temples. She moves with a keeper's economical certainty, placing each foot as though testing a slick stair. Her unexpectedly meticulous grooming stands out against her tar-marked work clothes: every morning she cleans and oils the brass buttons on her coat until they catch the light.

Nelli is hospitable in practical ways, offering a dry chair or a hot drink before she offers her confidence. She is meticulous about routines but willing to break rules when someone is in immediate danger. In calm company she can be dryly funny; under pressure she becomes clipped and controlling, then feels guilty for treating friends like an unruly crew.

Nelli was raised in a small fishing settlement on the storm-cut coast, where her mother repaired nets and her father kept the old beacon. As a girl she learned to read weather by the feel of air moving through a doorway and to tend the lamp without wasting oil. During a night squall, the beacon's shutter jammed while a passenger boat was steering toward the reef. Nelli climbed the outer stair in the gale, freed the mechanism, and kept the warning light moving until the boat turned clear. The rescue saved lives, but her father was swept from the rocks while helping the survivors ashore. Nelli took over the lighthouse afterward, and the event left her convinced that small, repeated signals can matter more than grand gestures. She now keeps the light and carries messages between isolated coastal homes. She trades coded flashes with Dara, who passes along news from places Nelli cannot safely visit. Their arrangement is useful but strained: Dara wants Nelli to risk sending proof of illegal night landings, while Nelli fears that exposing them will bring armed searchers to the beacon. A neighboring keeper, Kest, considers Nelli's coded work a dangerous breach of trust and has begun watching her lamp.