Yay!!! Elementary! I really love this show. I'll admit to some skepticism coming in to the first season, and it did have its shaky moments starting out, by the end of Season One I was officially a fan. Now, we're starting off the second season. After the chaos of the finale several months back, this premiere took a smart tack and started with a fresh story, moving away from the Moriarty/Adler business and towards some other familiar canon faces.
As we start out, Sherlock and Joan are working on a case involving carrier pigeons. It's silly and quirky and Joan gets to be a martial arts bad ass. Then, as the case is wrapping up, Sherlock gets a call from Hopkins, an ex-colleague in London, who tells him that another mutual colleague, Gareth Lestrade, has gotten into some trouble. Holmes and Watson go to London to help out.
Apparently, Lestrade has gone a bit crazy over a case - he believes that the husband of a murdered woman is in fact guilty, even though they haven't been able to find any proof. Sherlock finds Lestrade and works with him to prove the man's guilt, thus freeing Lestrade from the stigma of his failure and his crazed recent actions.
This was actually a relatively clever setup for a procedural. Rather than starting at the beginning of a case and seeing where it goes, we start at the end of the case. The entire episode revolves around Sherlock attempting to prove the guilt of one specific person. As any investigator will tell you, that's not the way to go about solving a crime. Nevertheless, Sherlock manages to succeed.