Watched all four episodes and found it to be a good, engaging, interesting drama. The low ratings lately are incomprehensible and I can only assume are placed from our American cousins who prefer their drama's to involve car crashes and chase scenes... IDK.... If you like a good British drama, well acted. Then you can do far worse than giving this a few hours of your time.
The story trots along from the initial disbelief of the lead character, to her eventual realistsation that all is not right with the story as its being presented. He own guilt at her drunken behaviour leads her to suspect that she may be at fault but then her suspicions start to grow as more details come to light.
Altogether a good story line, well played out, and the threads slowly pull together to a good conclusion..... what more do you need in a gritty drama ? .....