February 6, 2015 8:56 PM - Season 3, Episode 13 - Subscribe
With Kitty gone from his brownstone, Sherlock finds himself in the doldrums, digging through old cold case files and talking to a variety of people to keep his interest. When the wife of a lawyer shows up and wants Sherlock to do his "P.I. stuff" on her possibly cheating husband who she hasn't seen in 48 hours, Sherlock agrees to take on the missing person case to get out of his slump, pulling Joan into the case. While working together, Sherlock comments on Joan's dissatisfaction with her relationship with Andrew, which Joan tries to dismiss. And then the case takes some twists and turns, as does Joan's relationship with Andrew.