When Carmen, an 80-year-old widow, suffers a domestic accident, her daughter Lourdes decides to hire a caregiver to help with her daily needs. Used to living alone, Carmen rejects all the candidates, feeling her space is being invaded. This frustrates her daughter, whose life is disrupted by her mother's constant need for attention. The stressful parade of caregivers strains Lourdes’s marriage. Her husband Mario is forced to turn down an important job offer. Tired of the endless cycle of interviews, hires, and dismissals, Lourdes argues with her mother, which makes her feel guilty. Just when it seems no caregiver will ever be good enough for Carmen, Blanca arrives - a woman with an angelic appearance, kind, efficient, and resourceful. But things are not as they seem. Blanca hides a secret that will change Carmen’s life forever.