The Trailer Park

From the evidence I deduce that the killer, if there is a killer (as I don't know what you are even talking about), is Tim Burton 

Night Country is the fourth True Detective series.
The others didn't have their own extra title though and it's an anthology show anyway so you don't really have to worry about the previous ones.

Oh. Guess I am watching season 4 then. I thought there were four seasons of the Night Country thing. (It looked like it on the Swedish program page, but I guess they were just being fuzzy.)

And I think the possible killer who isn't there and who's probably a her, anyway, is Pizzoletto.

Finished Night Country. Good series though I'm a little divided on the ending, as usual.

Started watching Cormoran Strike. Almost changed my mind when I realised it was by Rowling but it seems OK so... I guess I will keep watching.

Edit: Commercial breaks!  

I enjoyed the first few episodes of that when they were setting up the characters and their relationship but once everything was established the subsequent stories felt a little bland and formulaic.

I only watched the first one so far (then I got side tracked playing with tintmasks in CK) but I'm already a little tired of all the huffing and puffing over his leg. Yes, I get it, he has a prosthetic leg. We don't need to be reminded every five minutes. I'm also a little confused about where he's getting the money to buy a cot and sleeping bag, not to mention the constant eating out, while he's apparently broke and has bills piling up in the office?

But other than that, I guess I can watch a few episodes more. Until it gets too bland and formulaic

I haven't continued Cormoran Strike yet; instead I started watching some Scottish (I think ) crime story. It's a bit confusing because they keep switching between English and... uh... Gaelic? Something incomprehensible or other anyway, but even when they speak incomprehensibly they mix in English words (like most languages do) and my brain gets even more confused when it recognises some words.
Swedish title translated back to English is Murder on the Island. No idea what the original title is.

Scots switching between speaking English and Irish? 

Irish speak Gaelic? They did actually refer to themselves as Gaelic a few minutes into episode 2, and they mentioned Edinburgh so I think they're in Scotland. In (or On) "the Islands"...