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.
A driver for a ridesharing company is killed when he is intentionally run over by a city cab. Holmes and Watson investigate and wonder if the death is a case of professional jealousy. Meanwhile, a casual romance Sherlock has with one of his longtime "irregular" consultants gets complicated when the woman makes a shocking request.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
When Holmes becomes the prime suspect in the murder of a woman who was killed during the height of his addiction, he and Watson retrace his steps to find the connection between Holmes and the woman.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
An unforeseen incident puts Watson in contact with crime boss Elana March. Holmes signs up Marcus to help him solve a theft at the local zoo.
A debt collector is murdered, and Holmes and Watson try to narrow down the suspect pool from thousands of consumers who owed the victim money. Meanwhile, Joan's relationship with Andrew progresses when he asks her to meet his father.moreless
Part 2 of 2. Sherlock and Joan increase their efforts when Kitty begins to unravel due to the imminent threat to her safety. The origin of Sherlock and Kitty’s relationship is revealed.
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.
Watson and Holmes investigate the murder of a bioengineer whose death may be linked to a drug cartel. Meanwhile, Kitty searches for a runaway teen; and Joan makes a major life decision but worries it will have a negative impact on Sherlock.moreless
Watson joins Holmes and Kitty to search for a missing nurse she used to work with. The investigation leads them to another person who recently disappeared.