I purchased this BBC series without knowing anything about it. As an X-Files fan, I was drawn to it because of Gillian Anderson's involvement. I was intrigued by her casting, and so took the plunge. Very good series, equally following the investigator (Anderson) and the serial killer (Jamie Dornan, yes the same Jamie Dornan who will be playing Christian Grey in "Fifty Shades Of Grey"). Although motivations of both main charcters are somewhat murky, the performances are very good. I thought Anderson pulled off her accent reasonably well. I really liked the Belfast-centric casting and production... it seems to add a grittiness or edge to the series.
Looking forward to Series 2!