The Killing Season 4: What a falling otf

I am dutifully watching the final season, six episodes, of The Killing, but lamentably have to note what a falling off is there: the first two seasons were terrific, as Linden and Holder unravelled the complex case, Who killed Rosie Larsen? The 3rd season was not nearly as good as it went for a grotesque, sensational, and highly improbable case, as opposed to the original case which was, on the surface, more or a routine homicide that proved intriguingly complex and ambiguous as more facts emerged in each episode. The great thing about the first season was combined minimal and maximal approach: a lot of the focus was on the family of the victim, who at times were suspects themselves, and also on the politics of the city, as a mayoral candidate got caught up in the sweep of the investigation. And of course the developing relationship between Linden and Holder, made especially interesting in these two seasons as we never quite knew whether we could trust Holder. By the 3rd season, he was more rock solid and the two of them were like a thousand other buddy cops trying to solve a case. Few were satisfied with the wrapup of season 3, and that's where season 4 picks up, but the season never gets off the ground. L & H begin investigating another pretty gruesome case - the killing of an entire family save for the son who's at a military academy and immediately becomes a suspect. We know by now that the formula is to shuffle through a sequence of likely suspects, each one cleared in turn, until finally settling on someone we'd least suspect (or so they think - I figured out season 3 pretty quickly). The main element of the story (spoiler for those who haven't seen season 3) is L & H trying to conceal the fact that she executed Lt. Skinner at the end of season 4. There are so many loose ends to this plot element that it's not even worth analyzing or thinking about; I would say however, that episode 3 has a few fine moments centered on Holder, who, surprisingly, is beginning to crack under the pressure of concealing their crime - returning to drink and drugs, pretty much breaking up his relationship with a nice young woman (they seem a terrible mismatch, however), heading for the deep end. It's the personal stuff, not the baroque plotting, that can maybe save this final season of the series.