I actually didn’t dislike the latest episode quite as much as the previous ones. Yes, Tosh constantly did the “owl” eyes, Sandy was as much use as a chocolate teapot, the Procurator Fiscal is a total dweeb but at least the story moved on a wee bit. However, there’s still just so much you can pick faults with, apart from the poor script and acting - the speed everything is processed by the lab, the fact that Ruth Calder could phone her DC and get all Bobby Bain’s info so quickly and on a mobile, the fact that RC and Sandy were openly discussing the case whilst sitting in a cafe, why did Tosh speak to Heather Bain in the street, etc.
I’ve just started reading Blue Lightning by Ann Cleeves, it’s the one when Jimmy goes back to Fair Isle and the difference in the quality of the writing is very apparent from page one. If I was AC, I’d definitely be telling the production company to call it something other than Shetland.