Not sure about this. I've not read any of the books so I've no ideas about how it should be done. I thought the beginning was effectively shocking and upsetting, and I will watch next week to see what's going on. But I found the relationship between the two main police people, and everything really about the woman policewoman investigating the complaint, just unbelievable somehow. Not bad acting, just something felt 'off' about the story. If this was a one-off story I don't know that I'd watch any more, but I might change my mind when I see the solution.
Minor point: I also think that the main policeman's boss being overtly hostile to him for no obvious reason is a real cliche - I'd love to see a police drama that didn't do this.