One of the least satisfying episodes in the entire series. As Bryan wrote, justice wasn't duly served, and it seems sex equals death for women and jail for men, and women murderers go free. It also has one of the poorest written police detective characters in the series -- presumptuous, rude, too emotionally involved to make objective decisions, as well as fail to come up with better, more searching questions for each person he interrogates. It is poorly written, in that there is emphasis on suspects that the listener knows is innocent, making the listener see the supposed-to-be-protagonist as an angry idiot, and the story wraps up so rapidly in the last minutes that it renders the entire acts before almost needless and overwritten, a front-loaded play. It feels like a Dickens work where a dozen new characters are introduced and exposed and then they are all neatly killed off or traveled off or married off in the last few pages. Well, 
I am a total geek and I know this is WAY over the top for a criticism but it is just a poor episode. 