I see using the word gratuitous has made others think I was referring to graphic scenes or whatever.
What I meant was having a major female character then become the victim of male violence. Although I suspect in real life women working in front line services do suffer attacks from men (although newspaper reports would imply that women in various forces are far more at threat from their male colleagues).
So I did rewatch all of series 3, and it went out of its way to send the right messages to women in terms of support and feelings of guilt etc.. And in fact was impressed by the actress playing Tosh (who as I said in the early series seemed a bit ditzy) conveying a whole range of emotions and turmoil.
And yes the bit with Billy was touching, but I thought the scenes where she went and shouted at her admirer (the artist who liked drawing the open carcasses of animals) were really touching. He was obviously out of his depth, but provided tea and eventually covered her with a blanket when she fell asleep.
Again quite a starry cast in this series, and am always happy to see Anji Punjabi!
But still, despite the many violent men, women as the orchestrators of evil.
On a more trivial level I prefer Perez in his (second hand?) Naval Pea Coat - a hangover from student days?
So have now started on series 4 (with the Norway connection) and am already lost, so many characters who I still cant organise in my mind, and this is my second viewing.
But this series definitely seems to me where Shetland descended into it's down hearted struggle with life tone, and Perez starts to speak so slowy that by the time he gets to the end of what he is saying, you cant remember where he began from!