Irlande, 1845. Par un froid matin d'octobre, alors que la Grande Famine ravage le pays, la jeune Grace est envoyée sur les routes par sa mère pour tenter de trouver du travail et survivre. En quittant son village de Blackmountain camouflée dans des vêtements d'homme, et accompagnée de son petit frère qui la rejoint en secret, l'adolescente entreprend un véritable périple, du Donegal à Limerick, au coeur d'un paysage apocalyptique. Celui d'une terre où chaque être humain est prêt à tuer pour une miette de pain.

Early one October morning, Grace's mother snatches her from sleep and brutally cuts off her hair, declaring, "You are the strong one now." With winter close at hand and Ireland already suffering, Grace is no longer safe at home. And so her mother outfits her in men's clothing and casts her out. When her younger brother Colly follows after her, the two set off on a remarkable odyssey in the looming shadow of their country's darkest hour. The broken land they pass through reveals untold suffering as well as unexpected beauty. To survive, Grace must become a boy, a bandit, a penitent and, finally, a woman-all the while afflicted by inner voices that arise out of what she has seen and what she has lost.