Season 1: the small town of Cienfuegos, it's a very special day for 7-year-old Alicia Vega and her family: her First Communion. However, when they are celebrating at the family's restaurant, closed for the occasion, she goes missing.
Season 2: Commissioner Víctor and Inspector Vidal investigate the disappearance and violent murder of several women in the surroundings of the Montalbán Polyclinic Hospital, on the outskirts of Madrid. With no other clues than the recording of a security camera in which the kidnapping of one of the women is recorded, what they do know is that the culprit is one of the hospital workers. The best way to find him is infiltrate the hospital.