The narrator, a wartime nurse writing a long confession to a departed mentor, recalls nursing in contagious wards and the upheaval when her twin brother is wounded and loses his sight. Facing sorrow and guilt, she wrestles with an escalating moral dilemma as devotion to her brother pushes her toward an irreversible action intended to secure his future. The narrative shifts between hospital routine, convalescent care aided by an aviation camp and a wealthy benefactor, and ruined landscapes, examining sacrifice, moral ambiguity, and how memory and love reshape identity after loss.