After Highland shepherd Colvin Munro disappears, a mysterious trail of his possessions is found in the Cairngorm mountains. Writing the eulogy for his memorial years later, his foundling-sister Mo seeks to discover why he vanished. Younger brother Sorley is also haunted by his absence and driven to reveal the forces that led to Colvin's disappearance. Is their brother alive or dead?

Set on a farming estate in the upper reaches of the River Spey, Of Stone and Sky follows several generations of a shepherding family in a paean to the bonds between people, their land and way of life. It is a profound mystery, a passionate poem, a political manifesto, shot through with wisdom and humour.