Sherlock is called in to investigate when a supposedly uncrackable bank vault called "The Leviathan" is breached. Meanwhile, Joan is pleasantly surprised when Sherlock meets her family and defends her choice to become a sober companion.
Episode number: 1x10 Airdate: Thursday December 13th, 2012
The episode begins with few masked men breaking into a vault and stealing a lot of expensive jewelry. Next, the doorbell is ringing and Watson comes downstairs to get the door. But she is surprised to see Gwen and Olivia in the house and they are barely dressed. They are twins and they spent the night with Holmes. Holmes arrives and he tells Watson that he shares a mutually beneficial relationship with the Lynch sisters. Watson finally opens the door and a man asks for Holmes and tells her that he was referred to Holmes by one of his friends in England. ..