Sonia Ledesma (Michelle Calvó), a 32-year-old inspector, is assigned to the Disappeared Group, within the Central Police Station of the Judicial Police. This police unit directed by the veteran Santiago Abad (Juan Echanove), is in charge of investigating and solving cases of people who disappear without a trace. Sonia will have as a partner Rodrigo Medina (Maxi Iglesias), sub-inspector with whom he will have strong disputes over his different conceptions in his police work. Both are condemned to understand each other.
This department will have the invaluable help of the Neighborhood Association “Help Missing Persons”, of which Carmen Fuentes (Elvira Mínguez) is president, a woman capable of removing heaven and earth to find all that person disappeared from the map.
Such collaboration is not the only thing that unites Sonia and Carmen. Both carry the drama of having lost someone: Carmen, her son Pablo, who disappeared seven years ago and Sonia, her husband Mikel, who she has not known for three years, when he was working with an NGO in Somalia.