This is a good suspense-crime-thriller. Reminded me the Korean film 'Memories of Murder', but not the same or similar, except the crime scenario and the location. Awesome to see a detective story that takes place outside the urban area. The Spanish countryside was so beautiful, those marshlands, especially from the aerial views.
I think the brilliant cinematography is the first thing anyone would notice and the 80s atmosphere. The narration was steady as the crime after the crime with tension arise, while on the other side the investigation adv... read the rest.
The plot of the actual crime is not the brightest but that's the only weak point of this movie.
The directing and photography are really, really good, with an atmosphere that remembers to the latest rising of the Scandinavian crime novels. Stieg Larsson, and series like Bron/Broen (which have been later deeply inspiring US series like "True Detective") are very present in this movie.