The recipe for comfort-detective-television is well established, starting with a community that is close-knit, picturesque and cursed with an improbably high murder rate, and adding a brooding, lonely, middle-aged male detective. And to an extent, 'Shetland' is pure formula milk. But there's something in the spectacular landscape that makes the stories affecting; and even if the role is thin, Douglas Henshall manages to invest it with a convincing, emotional gravitas that goes beyond what's written in the script. The plots aren't too bad either, although the low-key style (reiminiscent of the BBC version of 'Wallander') tends to defuse their dramatic effect. If allowed to run too long, this series will doubtless stale; but for the moment, it's still feels fresh, and as raw as the harsh Shetland climate.