I enjoyed the first two stories more in this four-story series. Unlike other reviewers, I didn't find the first story rushed. I thought the pacing was good.
It was pretty obvious what had happened to Helen and Linda in the past, so it isn't exactly a big reveal. However, I didn't think that the flashbacks added much to the story - perhaps there were just too many of them and neither of the young actress resembled the older ones much. I liked that the resolution at the end included the historic case being reported, though.
I'm not sure that there was much original in the first case - one police officer has to convince another that the wrong person has been charged etc - we've seen this many times before, but I liked the dynamic of having an established couple working together rather than a romantic tension cliche. I thought Ben Batt was really convincing as an excited prospective father, it was interesting that Helen Weeks isn't an entirely likeable character and I thought Matt King's character added quite a lot.
You have to suspend belief a little in the second story - as if a woman about to give birth would rush around investigating a case. The character dynamic also completely changes. I must say, I really wasn't really that interested by the gang-member story and I didn't feel sorry enough for the new gang member's situation. Those parts felt like a distraction or padding.
Some things didn't make sense - why does the criminal Frank take the action he does in light of the information he gives to Helen at the end? He may have made assumptions initially, but his henchman seems to get the full story but the course of action continues. Also, an item is stolen, we can eventually guess who by or, at least, who had arranged it, but why isn't it mentioned during the resolution?
The ending was a little flat: you've kind of worked out some of it by then, I didn't buy the blackmail part and Helen's disgust didn't feel real enough. It was all over in five minutes with an off-camera confession.I felt a bit "cheated" by that!
I thought Matt King was underused in the second story and the David Leon character was woefully underdeveloped.
Still, I'd watch it were a second series made but it would be a different programme out of necessity.