Oh boy. I guess I'm really glad we do get a Season Six, because that would be one hell of a way to finish a show... and not in a good way. Let's take a little look.
Last week, I almost made a guess as to what the deal was with the woman, May, who seemed to be following Sherlock around. I know there's no way to prove this now, but my guess would have been "May is a hallucination of Sherlock's mother, caused by Sherlock's brain tumor." And... yeah. I'm not saying I'm opposed to this turn for the show, as I think the buildup for it was beautifully executed, and there could be a lot of cool stuff to come out of this. But at the same time, I feel like this was just a little bit too obvious, you know? And too... dramatic, perhaps? This show is so brilliant at being down to earth. The characters are realistically professional when it comes to their cases, in the sense that they don't get personally drawn in to every little story line. I'm okay with some drama, but this show doesn't need to lean on soap opera plot threads like the lead getting a brain tumor. I have faith they will go somewhere good with this, but I'm slightly let down by the premise itself.
I'm pretty happy with the take-down of SPK. Wilcox, the head of the group, gives up his entire gang in exchange for immunity, but then screws up by lying about the one murder he actually committed by hand, and they get to put him away too. What I enjoy about this plot is that in some ways, things get tied up in a pretty little bow, which means that we can be pretty satisfied that all of the bad people are going where they belong. But on the other hand, there are some really sinister dangling threads left hanging, specifically relating to Joan Watson's moral compass.