Anna Fitzgerald, a young girl, was conceived specifically to be a genetic match for her sister Kate who is suffering from leukemia. From a young age, Anna endures numerous medical procedures to help keep Kate alive. The family's life revolves around Kate's illness and her treatments, which strains their relationships and puts immense pressure on each member. Anna loves her sister deeply but begins to feel that her life is entirely dictated by Kate's needs. This feeling intensifies as she grows older and starts to understand the full implications of being a "designer baby."

When Kate's kidney failure presents yet another life-threatening crisis, Anna takes the drastic step of seeking medical emancipation from her parents, particularly her mother Sara who is fiercely determined to save Kate at all costs. Anna hires lawyer Campbell Alexander to represent her in court, setting in motion a legal battle that threatens to tear the family apart. This decision forces the family to confront deep-seated emotions and truths about love, sacrifice, and autonomy. As the trial progresses, long-standing tensions and hidden feelings come to the forefront, challenging familial bonds and reshaping their understanding of life and death.