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
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
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
Tensions rise when Sherlock and Watson are teamed up with Lestrade to find the person responsible for a bombing.
When a up-and-coming ballerina is murdered, Sherlock is called in to solve the case. Watson tries to find a homeless veteran after his friend reports him as kidnapped.
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
While Holmes tries to make amends with Detective Bell, he and Watson look into the mafia's association with a body found in a barrel.
Moriarty is brought in to consult on a kidnapping case, bringing Holmes and Watson face to face with their former adversary. Detective Bell persists in his efforts to make a full recovery.
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.
An official police inquiry into one of Sherlock's investigations puts his and Watson's future with the NYPD on the line.
It's the NYPD versus Holmes and Watson when the two sleuths uncover a cold case serial killer.