Blackby has a weather-browned face, a broad nose, and a narrow, watchful gaze that checks doorways, windows, and the ground before it settles on a person. His coarse hair is cropped close at the sides but brushed carefully forward, an unexpectedly fastidious habit for a man who spends his days among sheep and mud. He moves with a shepherd's economical patience, placing each boot as if the earth might give way. His wool smells faintly of lanolin, smoke, and the sharp green scent of crushed herbs; people remember his alert eyes and immaculate hairline before they remember his plain clothes.

Blackby is generous with labor but sparing with explanations. In a crisis he becomes brisk and decisive; at a warm hearth he can be unexpectedly funny, though he changes the subject if anyone praises him. He wants people to depend on one another, yet resents being needed because it makes leaving impossible.

Blackby was born among the scattered farms above the old wool road and learned early that a shepherd's work is mostly noticing what others miss. As a boy, he slept through a winter storm in a collapsed byre while his sister, Hessa, went for help; she returned with a broken ankle, and Blackby never forgave himself for failing to hear her leave. Years later he became the person neighbors called when lambing went wrong, a roof beam sagged, or a lost child had to be found before dusk. His practical help made him useful, but an unexplained stretch of years away from the valley made him an object of rumor. Oswin Hirst knows the truth of that absence and remains his one steady connection to the outside world. Now a boundary dispute threatens the grazing paths, and someone has been leaving dead crows on Blackby's gate. He suspects the warning is connected to the old matter he has tried to bury.