Shetland: Season Four - Episode Six

Perez: 'Christ, Rhona. Do you think I want this to be happening?'

When the closing credits started to roll, I thought to myself: well, at least I guessed one of the killers. After some honest contemplation, I was forced to admit that the only reason I guessed who killed Lizzie was because at some point I've suspected everyone: Duncan, Drew, Kate... even Curly Haired Jigging Woman and Beardy Extra. So kudos to David Kane for writing a script that kept us guessing till the end, and then kicked us up the arse for daring to believe in justice.

Shetland: Season Four - Episode Five

Sandy: 'Jo, can you remember who did this to you? Was it Thomas Malone? Was it your ex-husband?'

Sandy finally managed to ask some sensible questions this week, only to be scuppered by Jo's knackered throat and the old witness-out-of-commission ploy. At least we know who gave Jo a mullering, although we're still in the dark as to whether she has any deeper involvement in the story. After the appearance of her shady can't-tell-the-truth-for-shit husband, I'm guessing so, but it was nice to see a cliffhanger with consequences.

Shetland: Season Four - Episode Four

Perez: 'Nobody's better off dead.'

If last week's sinister music, sombre faces, and speeding vans were anything to go by, Tosh and Jimmy should've been in the shit tonight. Spoiler alert: nothing dramatic happened. I may have been wrong about the vans' occupants being disreputable halibut salesmen, but the truth was only marginally less fishy: it was simply the local constabulary wanting a chat. Stay tuned to see this week's cliffhanger explained away as Jo slipping on a banana skin and knocking herself out on an inconveniently placed easel.

Shetland: Season Four - Episode Three

Perez: 'This isn't your case any more. You had your chance over twenty-three years ago, and you blew it.'

I was ready to dislike this week's episode. For me, Shetland is at its best when it's telling parochial stories about island folk, so I wasn't sure the temporary shift to urban far-right politics would work. Turns out my concerns were unfounded: as well as providing some lovely scenery, the coldness and remoteness of the Nordic countryside were a great tonal match for the subarctic archipelago.

Shetland: Season Four - Episode Two

Tosh: 'Twenty-four seven I'm keeping it together. And it's exhausting.'

One thing that's concerning me this season is the return of Cassie and Tosh. Don't get me wrong, I love having them back, but you have to wonder why they're back. If last season taught us anything, it's that the show doesn't shy away from hurting Tosh, and in a story centred around the murder of young women, you have to worry for Cassie. It's uncertain yet whether Alan Killick is guilty of anything more than loving someone who didn't love him back, but on an island as small as Shetland, the murderer can't ever be more than a stone's throw away.

Shetland: Season Four - Episode One

Malone: 'You know, your daughter didna deserve this. But you did.'

If there was ever a perfect time to watch Shetland, it must surely be a cold February night, with the wind howling around the eaves, rain thrashing the latticed windows, and a gigantic bowl of porridge on your lap. I unashamedly love Shetland. Whether that's because it's so different from other UK detective dramas, or because I think the sun shines out of Ann Cleeves' bottom, who can say? What I do know is that Tuesday nights just got a whole lot murderier.