This is an excellent production by the BBC. The only downside is sometimes it is hard to understand their "English". (Apologies to the Btits!) Just when you think you have it figured out, and this is a mini-series that keeps you engaged so you want to figure out who-done-it, the plot takes a sharp turn with the addition of new evidence or a new character.
The acting is excellent, the setting is realistic and the action is fast moving. Would like to see other mini-series by this writer.