As her marriage to Jack (Stanley Tucci) flounders, eminent High Court judge Fiona Maye (Emma Thompson) has a life-changing decision to make at work - should she force a teenage boy, Adam (Fionn Whitehead), to have the blood transfusion that will save his life? Her unorthodox visit to his hospital bedside has a profound impact on them both, stirring strong new emotions in the boy and long-buried feelings in her.