Season: Three — Episode: 1 Director: John Polson — Writer: Robert Doherty and Craig Sweeny — Aired: October 30, 2014 — Viewers (millions): 7.57 Summary: Holmes returns to New York with a new apprentice and a renewed interest in working with the NYPD after being fired by London's MI6. However, Joan Watson must give her approval first.
I don't care why you're back. Just stay out of my case.
— Watson to Holmes
Watson helps in the apprehending of Elana March who is a new crime kingpin after her husband's death. However, evidence against March keeps disappearing in every instance. The chief witness and her attorney are shot in a closed elevator when going to testify against March.
Meanwhile Kitty has been following Watson and engages in a single stick combat with her . At first Watson thinks she has been sent by March to tail her, but her expertise with single stick makes her realize that its Sherlock she has come from. She goes to the brownstone to find out and finds Sherlock back from MI6.
Watson is trying to figure out how the witness could have been shot in a closed elevator which did not stop at any floor when Holmes lends his help. He figures out the methodology of the murder without the presence of the actual assasin, he also hones down on the name of the murderer. The only thing left is to gather actual evidence of the crime. Watson agrees to Sherlock rejoining NYPD as a consultant in light of his crucial, although unasked for, help in furthering the case. Elana March tries to threaten Watson off the case.
However, ultimately Joan and Sherlock find the evidence to make the assassin testify against March and closing the case.