Sunniva has a compact, weather-braced presence, as if she has spent decades leaning into wind that never quite stops. Her face is broad and mobile, with a small, ink-dark birthmark at the edge of her jaw. Her hair is parted with exacting care and wound into a tight coil, but salt damp has coaxed loose wisps around her temples. She moves with short, quick steps, constantly testing the ground before committing her weight. Her most unexpected feature is a pair of immaculate, embroidered cuffs peeking from beneath a mud-stained work coat: she stitches tiny gold-colored birds into them, one for every person she has helped evacuate.

Sunniva is patient with frightened neighbors and sharply impatient with people who confuse official confidence for knowledge. She is methodical when recording evidence, yet willing to break her own plans the instant someone is in danger. In a calm room she can be dryly funny and surprisingly welcoming; during a crisis she becomes clipped, direct, and difficult to distract. She wants to trust people, but has learned to ask what they have actually seen.

Sunniva was born on Linden Cay to a family of peat cutters and ferry hands. As a child, she learned to read the island's moods from the way brackish water appeared in wells and how gulls shifted their nesting places before a hard blow. Her mother, Edda, taught her to mark each change on scraps of sailcloth; those scraps became the first pages of Sunniva's growing survey. At nineteen, during a night of heavy rain, a footpath gave way beneath a cottage. Sunniva heard the slope groan, ran door to door, and got six neighbors clear before the hillside slumped into the bay. The officials who inspected the damage called it an ordinary storm loss. Afterward, Sunniva stopped trusting conclusions that arrived before anyone had listened to the people who lived there. She became a shoreline measurer and informal warning bell, documenting new fissures and sinking ground while helping families move belongings to safer homes. Her closest ally is Veli, a ferry pilot who carries her messages between the cay and the mainland; her older brother Olli thinks her warnings are costing the family its last good standing with the authorities. Sunniva's current problem is that the island's eastern ridge is settling faster than her maps can keep up, while officials keep delaying a full evacuation until she provides measurements they have already refused to fund.