Mycroft shows up in New York to ask Holmes and Watson to solve a case concerning his former fiancée. Mycroft and Joan's relationship is a source of contention with Sherlock.
Homes and Watson get a look into Captain Gregson's private life when they investigate after masked men invade the Captain's home.
When Holmes and Watson discover an assassin's body, they must delve through the mob world for an answer. Watson helps a friend find the man of her dreams.
As Holmes and Watson investigate the murder of a financial consulting company's CEO, a mysterious woman from Holmes' past surfaces as a suspect.
Watson and Holmes search for the civil contractor responsible for leaking classified information but soon find themselves targeted by cyber activists. Joan decides to sign up at an online dating service.
Holmes and Watson investigate the murder of a well-respected mathematician and look into the guarded equation he was trying to decipher. Watson is at a loss when a former patient's son asks her for a loan.moreless
Holmes and Watson head to London for an unsolved mystery investigation and to look up his former mentor, Gareth Lestrade. Sherlock joins up with his estranged brother, Mycroft, who discloses some secrets.
Skyler's past catches up with her while Walt needs to cover his own tracks. Jesse continues to struggle with guilt. (Written by Thomas Schnauz. Directed by Michelle MacLaren.)
Flashbacks reveal what led to Sherlock's downfall into addiction as the re-emergence of Irene Adler leaves Sherlock stunned.
A man claiming to be Moriarty hires Holmes to solve a murder. Watson is being pushed by Gregson to go back to being a sober companion rather than pursuit dangerous exploits with Holmes.moreless
The hunt is on after Sebastian Moran a.k.a. M reveals to Sherlock that a man dead from an apparent heart attack was actually a victim of Moriarty.
Holmes and Watson look for a murdered blackmailer's accomplice. The blackmailer was targeting families of rape victims. Sherlock opposes celebrating his one year of sobriety.
George has to tell Tessa he sold the house and they're moving in with Dallas. Tessa and Dalia grow further apart when Dalia does her best to make Tessa miserable. Tessa is out for break-up revenge. Noah fixates on Carmen even though she's dating his therapist.
Sheila embarks on a chastity campaign in Catswin. Figuring Lisa will be crowned queen, Sheila gets Mr. Wolfe to hold a Chastity Ball. George buys a house for Dallas while Tessa sets up residence in her bathroom stall at school.
With a Nor'easter as their backdrop, Sherlock and Joan attempt to keep one of the largest cash vaults in the country from being robbed. Sherlock does his best to console a transgender woman with a broken heart.moreless
Sherlock becomes intrigued by Watson's first solo case when the goodbye video left by the missing woman mentions a murder on a subway platform.
A wealthy man comes to Sherlock saying his incurable illness was given to him on purpose. To teach Joan his tricks of the trade, Sherlock sends Joan to a suspicious dry cleaning establishment.moreless
When Detective Bell is attacked while off duty, Sherlock finds the case isn't so obvious as it first appeared after the suspect is found dead. Sherlock pushes Joan to learn self-defense.
When Sherlock's ex-drug dealer, Rhys, comes around for help, Watson is concerned about Sherlock's sobriety after Rhys implies that Sherlock on drugs made a better detective.
While trying to predict the next move of erratic criminal Martin Ennis, Sherlock is forced to work with an FBI profiler. The same profiler who wrote an acclaimed book about the notorious criminal. Elsewhere, Watson faces eviction from her apartment.moreless
With Sherlock suspended from working with the NYPD following the "M" investigation, Watson does her best to mend the rift between Sherlock and Captain Gregson. Meanwhile, Sherlock decides to investigate a suspicious accident involving a conspiracy theorist.moreless
A British criminal with strong ties to Sherlock's past has shown up in New York. Watson isn't sure about whether to take on a new client.
Sherlock and Joan are called to investigate the death of the general manager of a high-end Manhattan hotel after her body is found inside one of the hotel's washing machines. With Joan's time as his companion drawing to an end, Sherlock asks Joan to stay.moreless
When a bank vault that is supposed to be impenetrable is breached, Sherlock is asked to investigate. Sherlock meets Watson's family and, much to her delight, stands up for her decision to become a sober companion.moreless
The vicious murder of a college professor calls for Sherlock's deductive reasoning skills. A lover from the past asks for Watson's help.
Sherlock discovers a long hidden crime while investigating a bombing. Watson pushes Sherlock to choose a sponsor.