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 discover the perpetrator behind the attempt made on Morland's life and find a shocking connection to themselves.
Holmes suspects his father of murder after one of Morland's employees is killed under the guise of a robbery.
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 mysterious woman who claims to be a former associate of Sherlock's brother tells Holmes that her life is in danger. It's soon revealed that the woman runs illegal, high-stakes poker games. As Holmes and Watson investigate, Joan becomes suspicious that their new client isn't being truthful.moreless
Holmes and Watson investigate a woman's murder and learn her death is linked to a piece of artwork that has ties to a crime that was committed when she was in college. Meanwhile, Joan tries to forge a connection with a recent client in the wake of a shocking personal revelation.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
Holmes and Watson investigate the murder of a man who secretly fought crime dressed as a comic book superhero. Meanwhile, Morland makes a surprise donation to Watson's favorite charity, in order to compel her to do him a business-related favor.moreless
At the urging of Morland’s wealthy associate, Henry Baskerville, Holmes and Watson investigate the bizarre death of his brother who was reportedly chased to death by a large, glowing animal too fantastic to be real. Trauma from the bombing at the morgue begins to negatively impact ME Hawes’ work.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
The identity of Sherlock's mother is revealed and his strained relationship with Morland reaches a breaking point. Meanwhile, an elderly woman emerges as the prime suspect in the murders of three gang members.moreless
Holmes and Watson search for a murderer who used poisonous mushrooms to kill a botany professor and a group of the instructor's students. Meanwhile, Joan learns that her neighbor is renting his home through a vacation site that caters to hard partiers.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 search for a killer without any physical evidence to help them after a bomb explodes in the New York City morgue. Meanwhile, Joan grows suspicious when a detective she is in a grudge match with asks her to consult on a case.moreless
Holmes' relationship with his father suffers a setback when he discovers Morland has been keeping a secret that threatens their safety. Meanwhile, Sherlock and Watson investigate two murders linked to a college and its illegal recruitment practices.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 investigate a homicide in which the victim was murdered in a manner reminiscent of crimes committed by an infamous and already incarcerated serial killer. Meanwhile, Bell gets tutored by Sherlock and Joan for a police sergeant's exam that could lead to a promotion and a post at another precinct.moreless
Watson is enraged when her stepfather writes a crime novel based on her work with Holmes without her knowledge. Meanwhile, Sherlock and Joan investigate a retired FBI agent's murder and learn the man's death is linked to an unsolved case from the victim's career.moreless
Morland offers to act as one of Sherlock's "Irregular" consultants to help his son and Joan solve a case.
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
Holmes and Watson discover that a murdered fertility lab technician led a secret personal life which leaves them with multiple suspects. An NYPD detective investigates Watson.
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
Morland offers to use his influence to have Sherlock and Joan reinstated as consultants to the NYPD, but Sherlock questions his father's motive. Meanwhile, Watson helps the FBI investigate a triple homicide at a top secret research lab.moreless
Season 4 begins with Holmes facing criminal charges in the aftermath of his recent violent behavior and relapse, and his father arriving in New York to fix his estranged son's troubles by any means necessary. Meanwhile, Sherlock and Watson investigate a case in which a woman goes missing and may have been killed by her husband.moreless
Season 3 ends with Holmes' recovery sponsor disappearing. Sherlock delves into the man's life for clues and questions whether his friend has been abducted or has suffered a relapse into addiction.
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 embark on an interstate search for an escaped convict who may have murdered a judge. Meanwhile, Bell's new relationship hits a rough patch when Sherlock applies his deductive reasoning to it.moreless
Holmes and Watson join the manhunt to find the murderer of two New York City paramedics and the woman he abducted. Important information learned about Alfredo, strains his relationship with Holmes.
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
When a member of Everyone is murdered, Holmes and Watson find themselves drawn into a civil war playing out on the Internet.