Over and over again, Spanish producers are making thriller shows like this one, and over and over again are failing in exactly the same. The only explanation I have is that showrunners have an unrealistic perception of their own talent and capabilities.

In this case, the premise is good. It is a noir or police/crime thriller, with a commercial vocation. They do not try to discover the wheel, just to create an interesting story, and unexpected twists where no one is what they seem to be.

The problems: The script is really bad. The dialogues are sometimes ridiculous and the behavior of characters are always moving between unrealistic to stupid. The lack on internal logic, the inconsistencies, and the lack of a minimal realism in the characters' behavior make difficult to suspend disbelief. Moreover, are trying to add so many twists and subplots that add nothing interesting, to the point that the thing turns to boring and ridiculous after the first two episodes, the best of the show.

As usual in Spanish shows, the depiction of police work and interactions is sometimes poor or even ridiculous and offensive. Clearly, a story or characters cannot be more intelligent than the writers. And the writers seems to be very limited and lazy. They even didn't document or checked the most essential police procedures. The main female character doing the part of a police inspector is just not well suited for that role, being ridiculous sometimes. So, we can add the bad casting decisions to the fails that plagued this show.

The actor's work is lamentable. Actors are really bad. They cannot even talk clearly, to the point that you want to switch on the subtitles, because is very difficult to understand in their poor diction. Two main characters, both well known actresses in Spain, are constantly overacting. I think that spanish productions should care that. When you rewatch old movies and shows, the actors talk perfectly well and intelligibly. What happened?

It is always the same. They have good ideas, the production and resources are good. But they ruin it failing always in the same points: not so good acting, poor scripts, unbelievable and illogical behavior of characters.