I have watched all 3 episodes and enjoyed it. I found it dark, compelling and I thought Malcovich, or however you spell his name, excellent.
I must admit I do miss the cosier David Suchet versions.
Thinking of selling due to heat
What’s a household item that reminds you of your grandma’s house?

We didn’t guess who the killer was (we never do), and I can’t remember who it was in the book (ditto). But it was a good episode, imho (apart from the priestly background, which I guess was all made up?).