From Netflix:

BBC police detective drama series set in Aberystwyth against the backdrop of mountainous terrain, close-knit villages, and windswept sand dunes of the coastline to the badlands of the hinterland. Starring Richard Harrington as DCI Tom Mathias.

UPDATE: April 2016

Netflix now offers Season 2 with 5 episodes. Below the older review still holds true, especially how slow moving and taciturn the scenes are.  Always start with the beginning episode: although each episode is a self-contained story, there are sub-threads that run through all the episodes which are crucial for appreciating the series.

From Netflix comes this Welsh one-season detective series either as DVDs or streamed. All four episodes are intense and grim. For example, episode 1 involves child abuse. Richard Harrington as DCI Tom Mathias is the silent type: he broods more than he speaks. Photography is beautiful although it depicts Wales as a barren, wild, scenic land. In this respect the mood of the country matches the mood of the characters. Episode 3 was a bit complicated. Spoken language is English and subtitles are available. Acting is superb. Plots are well constructed.

If you can survive the dark atmosphere, DO NOT MISS!