I've seen a few things recently where they have gone off-piste for back-story embellishment mid-series. I'm not a huge fan of that style, but it was vital in this case.
Baby Reindeer on Netflix is interesting, troubling and dark! 7 episodes of about 30 mins each. Based on a true story which makes it all the more worrying!
Don't bother with Love Rat on C5. Weak!