One Small Life tells the story of Mari, a young girl who loses the only person in the world who cares for her, her grandmother, in a brutal and senseless act of violence. Because she is so traumatized that she cannot speak, she is taken to a mental institution where she is left to live out her life in darkness and despair. When Cindy, a nurse, comes to work at the hospital and starts to develop a special relationship with Mari, she begins to ask questions about the grandmother's murder and finds herself pitted against forces of evil so strong that they threaten to cost her everything she...