Setup is not unique, but it has some original angles and thoughts that make it entertaining.
I like that it's short and well paced, instead of dragging the matter like most series do nowadays.
Overall visual quality is great. Same can be said about actor performances.
Although overall its okay, some characters really seem to be acting out unreasonably just for drama's sake, which doesn't make a show great.
Main flaw, as I see it, is that it fails in building up the tension as it potentially could. There is no depth to the suspects, no depth to the main characters, expect a little bit for the protagonist, no small detail to enhance the mystery. Even the "villain" is not explained - movies in the 90's did it better.
Overall, it's a good show to spend an evening, the take is interesting, but it's superficial. The setup of this show is much better than the eventual execution is.
Maybe more will be explained in the next season, adding depth and detail, but it's an unsatisfying drag.