“Who Shines in Battle” is the etymological meaning of the name Bertille — the younger of two sisters in the Roussier family, who has a severe disability with an uncertain diagnosis. The family lives in a fragile balance around this child, who absorbs everyone’s efforts and thoughts, and who could lose her life at any moment. Each member of the family builds their life and copes as best they can with the demands of this rhythm and the uncertainties it brings. The parents, Madeleine and Gilles, and the older sister, Marion. What is daily life like, and what futures lie ahead, for a mother, a father, a couple, and a teenager whose responsibility for her younger sister has forced her to grow up too fast? When a new diagnosis is made, the cards are reshuffled and a new horizon emerges…