Original air date: 09/26/2013 Runtime: 43:19 min. Holmes and Watson travel to London to help track down an old mentor and investigate an unsolved mystery. Meanwhile, Mycroft Holmes, Sherlock's estranged brother, reunites with Sherlock and reveals some secrets of his own. Rhys Ifans guest stars.
Original air date: 10/03/2013 Runtime: 43:17 min. When a well-respected mathematician is found dead, Holmes and Watson set out to solve a murder and the purpose of the highly guarded equation he was trying to decipher. Meanwhile, Watson is conflicted when the son of a former patient approaches her for a loan. Jeremy Jordan Guest Stars as Joey Castoro, the Son of Watson's former patient.
Original air date: 10/10/2013 Runtime: 43:23 min. When Holmes and Watson set out to track down a civil contractor who leaked classified information, their lives are disrupted when they are targeted by the group of cyber-activists protecting him. Meanwhile, Joan takes the advice of a friend and signs up for an online dating service. Tony Award winner Steve Kazee guest stars.
Original air date: 10/24/2013 Runtime: 43:14 min. Holmes and Watson find themselves digging through the dark world of the mob to find a killer when they discover the body of a former assassin. Meanwhile, Watson helps a close friend track down a mystery man who swept her off her feet.
Original air date: 11/07/2013 Runtime: 43:23 min. Sherlock’s brother, Mycroft, arrives in New York and enlists Holmes and Watson to help solve a case involving his former fiancee. Meanwhile, Sherlock has a difficult time accepting Mycroft and Joan's relationship. Rhys Ifans guest stars.
Original air date: 01/02/2014 Runtime: 43:20 min. Holmes and Watson come face to face with Moriarty when their one-time adversary is brought in as a consultant on a kidnapping case. Meanwhile, Detective Bell continues his struggle on the road to recovery. Natalie Dormer Returns as Moriarty.
Original air date: 01/30/2014 Runtime: 43:24 min. When Joan revisits one of Sherlock's cold cases, she discovers an unsolved murder is connected to a rare prehistoric fossil. Meanwhile, Sherlock finds himself in uncharted territory when his duties as a sobriety sponsor cross his personal boundaries.
Original air date: 03/06/2014 Runtime: 43:17 min. Holmes and Watson consult on a case in which a man suspected of murdering his wife years ago receives a ransom demand for her safe return. Meanwhile, Lestrade overstays his welcome at the brownstone and seems unwilling to leave. Sean Pertwee guest stars as Gareth Lestrade.
Original air date: 04/24/2014 Runtime: 43:18 min. When Sherlock's brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics. Rhys Ifans guest stars as Mycroft Holmes.
Original air date: 05/01/2014 Runtime: 43:21 min. Business becomes personal for Sherlock when he is forced to partner with his estranged brother, Mycroft, to solve a case with life-or-death consequences. Lucy Liu makes her directorial debut for television. Rhys Ifans guest stars as Mycroft Holmes.
Original air date: 05/08/2014 Runtime: 43:22 min. Holmes and Watson come into contact with MI-6, the British intelligence agency, when a standard murder investigation turns out to have international and political implications. Meanwhile, in the wake of a crisis, Watson reevaluates her relationships with Sherlock and his brother, Mycroft. Rhys Ifans returns as Mycroft Holmes.