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.
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".
A bored Holmes forces his investigative services onto Watson when she tries to locate a woman who has been missing for five years. The only clue is the smell of nutmeg at the site of her disappearance. Meanwhile, Joan's bond with her long-distance boyfriend is tested when a man from her past reappears and asks for her help.moreless
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
Sherlock takes on the case of a stolen artificial intelligence software program, but seeks out Joan when he'd rather disprove the computer's abilities than find the thief. Joan meets Sherlock head-on when she finds out he's met with Andrew without telling her.moreless
A math genius, who is part of Sherlock's network of "irregulars" experts, stumbles upon a body while participating in a math puzzle competition. Meanwhile, Joan reaches out to Kitty, after she learns about Kitty's past.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.
Season 3 begins with Holmes returning to New York City with a new apprentice and a renewed interest in working with the NYPD after being fired by London's MI6. Unfortunately, Joan, the NYPD's new go-to private investigator, must give her approval first before Sherlock can resume consulting for the department.moreless
Season 2 ends with the relationship between Holmes and Watson coming to a crossroads, but they agree to put their differences aside to help Sherlock's brother Mycroft, who faces accusations of treason and murder.moreless
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.
A surprise visit from Sherlock's brother Mycroft leads to discord between Holmes and Watson. Meanwhile, Sherlock and Joan investigate a missing person's case that takes them into the world of unmanned aeronautics.
Holmes and Watson chase the source of a lethal toxin after a pickpocket dies of anthrax poisoning.
Holmes and Watson investigate when a presumed dead serial killer looks as if he's killing again.
Holmes and Watson investigate when an influential cancer researcher is murdered. They must figure out if his new cutting-edge invention played any part in his death. Detective Bell is given clearance to resume field work.moreless