The plot starts with the discovery of two skeletons at the bottom of a water reservoir as the ongoing event of severe drought has led to the unflooding of the drowned village of Campomediano.[5] Police inspector Daniela Yanes takes over the case.[5][6] The plot gets to involve two families living at different sides of the border between Portugal and Spain.[7]
Produced by Spanish and Portuguese public broadcasters RTVE and RTP in collaboration with Atlantia Media and Coral Europa, the series was written by Arturo Ruiz and Daniel Corpas whereas the direction was tasked to Joaquín Llamas and Oriol Ferrer.
Director Joaquín Llamas described the series as a "thriller mixed with a 'family noir'".[10] José de Castro was responsible for the score.[7] Shooting began in the Madrid region in June 2021.[11][12] The crew later moved to Cáceres, Extremadura. Filming locations in Cáceres included the old town, the sanctuary of Virgen de la Montaña, the area near the Palacio de Justicia and the old mining neighborhood of Aldea Moret [es].[13] Production in Cáceres ended in late July and then moved to the Lisbon region.[2][14] Production also worked in Leiria.[15] Originally intended to consist of six 70-minute-long episodes, it was restructured to fit a format of 8 episodes of around 60 minutes.[1]
The series was pre-screened at the "IberSeries Platino Industria" Festival on 30 September 2021.[16]