The second episode started off not quite as strong as the first. Telling the tale of how the two met in the first episode was magical and understandably difficult to outdo. Setting up the mystery took some time, but once things started going it was fantastic London action. I didn't recognize this case from the selection of Conan Doyle books I've read. There were some elements that were familiar. Sherlock discovers a cypher using numbers from a certain copy of a common book. This was from the opening scene of The Valley of Fear. In Valley of Fear the common book used for the cypher was the previous year's Almanac. There are some nice scenes in The Blind Banker as Holmes works out what copy the villains used for theirs.
Whoever is responsible for paring Benedict Cumberbatch and Martin Freeman together as Holmes and Watson deserve an award for seeing the chemistry between them. Watson has always been very likable and easy to relate to and I find this with Martin Freeman. Getting to know Sherlock from the Conan Doyle fictions, I find him fascinating, but if I actually knew him he would quickly drive me crazy. In the novels Watson should be commended for his ability to tolerate his extremely odd roommate, flat-mate, lodger, whatever. In this series, its a bit refreshing and perhaps more realistic to see Watson's patience wearing thin already. I'm convinced Cumberbatch is Sherlock Holmes while captivated by the show. Some of the events or clues that are presented in the show seem like the literary counterpart would have picked up on long ago. I thought this more so in the first episode than this second one. Fine writing, none-the-less.
I'm looking forward to how Moriarty will be properly introduced. It seems like Sherlock is still relatively unknown by... him? Them?... What if they do a BSG (Starbuck) and make Moriary a.... HER?