Season 4 ends with Holmes and Watson facing reprisal from the perpetrator who wants Morland dead, and realizing they dangerously underestimated the scope of their new enemy's influence.
Holmes and Watson investigate a double homicide and discover the victims were staging a fake murder at the moment they were killed. Meanwhile, Joan's inside man at Morland's office encounters a problem that threatens to expose her spying to Holmes and his father.moreless
A survivalist doctor goes missing, and Holmes and Watson must determine whether he purposely went off the gird or is a victim of foul play. Meanwhile, Sherlock exhibits odd behavior when his romantic relationship with Fiona hits a rough patch.moreless
Watson discovers Capt. Gregson's secret relationship with a former female NYPD officer and inadvertently sets the couple's breakup in motion. Meanwhile, Holmes investigates the murder of a wealthy woman who left her vast estate solely to a beloved dog.moreless
Holmes is asked by Narcotics to orchestrate a perfect heist inside the heavily armed and virtually impenetrable compound of a drug-dealing biker gang. Meanwhile, Watson assists Fiona Helbron on a case and makes a surprising discovery about Holmes.moreless
Holmes and Watson hunt for a computer hacker responsible for three murders, including the death of a Russian billionaire who was visiting New York City. Meanwhile, Joan receives a solo dinner invitation from Sherlock's father.moreless
Holmes and Watson's latest investigation involves the murder of an archeologist who they think was killed by what he discovered in a local landfill during his last dig. Sherlock and Alfredo's relationship hits a rough patch.moreless
Sherlock offers to help his father resolve a work issue in exchange for his prompt departure from New York City. Meanwhile, Holmes and Watson investigate the murders of two men who looked alike. The probe leads them into the world of facial recognition technology.moreless
Holmes and Watson investigate the death of a member of Holmes’ online beekeeping community. Captain Gregson solicits Watson's services for an off-book investigation that helps him make a life-changing decision.
Holmes and Watson investigate the murder of a professional skeptic who debunked paranormal, religious and scientific phenomenon for a living. The probe uncovers a potential threat to homeland security. Meanwhile, Gregson's daughter asks Joan for help with a case.moreless
Holmes and Watson investigate a murder where the victim was flash-frozen at the time of death. Watson's mother puts Joan in an awkward position by asking her to confront her brother about his affair.moreless
Holmes and Watson delve into the world of wrongful death compensation while they investigate a serial murderer who leaves envelopes of cash on the victims. Holmes does a kind act for Watson after she undergoes a personal crisis.moreless
Part 1 of 2. Watson begins her new job as an in-house investigator for an insurance firm, but her attention shifts when she joins Holmes to eliminate an imminent threat to Kitty.
When an NYPD officer is murdered, Holmes and Watson join the investigation. Sherlock looks for the person posting his personal statements made in sobriety meetings on a "recovery blog".
Holmes and Kitty investigate the murder of a postal store owner whose death is connected to the illegal diamond trade. Meanwhile, Gregson's career is placed in jeopardy when he hits a fellow NYPD officer.moreless
Holmes and Watson join forces to investigate a double homicide, but Kitty gets jealous of their rapport and allows it to override her better judgment in the case.
As Holmes and Watson work a standard murder investigation, they encounter MI-6 and find the case has international and political inferences. Watson re-examines her relationships with Mycroft and Sherlock.
Holmes and Watson chase the source of a lethal toxin after a pickpocket dies of anthrax poisoning.
Holmes and Watson are called in to consult when a woman, who was thought murdered by her husband years ago, appears now to be a victim of a kidnapping after her husband receives a ransom demand. Holmes and Watson are eager for Lestrade to leave the brownstone but he doesn't seem inclined to do so.moreless
As Watson peruses one of Holme's cold cases, she figures out that a rare prehistoric fossil is tied to the unsolved murder. Sherlock is in uncharted territories as concerns his duties as a sobriety sponsor.moreless
Holmes and Watson set out to determine which client killed a hedge fund manager running a Ponzi scheme. Sherlock considers becoming a sponsor for a recovering addict.
The murder of beautiful woman, linked to a billionaire CEO, catches the attention of Holmes and Watson. Mycroft does his best to convince Sherlock to move back to London.
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.
Once again the mysterious Moriarty has his sights set on Holmes and Watson.
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.
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.
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.
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