Elementary: Season 3

Six months after Joan moved out, she is running her own investigation firm and helps bust female drug kingpin Elana March. Two months later, the case has gone stagnant and the key witness in the prosecution of the kingpin is murdered in a hotel elevator. To her surprise, Joan discovers Sherlock has returned with a new protégé named Kitty Winter, and is working on the case as well, after being fired from MI6. The three must find a way to get along and work together while finding the murderer, ski

A double murder appears to be revenge for the deaths of children poisoned by GHB, the inadvertent result of cost-cutting measures taken by the Indian manufacturer of toy beads. Each of the victims received five orange beads in the mail. The father of one of the children confesses, but Sherlock deduces that he is lying. FBI agent Vince Boden refuses to provide whatever information the agency has, citing policy. Evidence vital to the case against the murdered men has gone missing, which complicate

Mathematician Harlan Emple comes across a dead body packed in mothballs while participating in a "math hunt", a number game with a puzzle involving Belphegor's prime. When another body is found, it is believed that the game is intended to be a death trap for mathematicians or, as it turns out, one mathematician in particular. Meanwhile, Joan tries to convince Kitty, who was a rape victim, to join a support group.

Software developer Edwin Borstein has created an artificial intelligence (AI) program called Bella, and he hires Sherlock because someone has broken into his company and stolen a copy of the program. Sherlock takes the case, not because he finds it interesting, but because he does not believe AI is achievable. He solves the theft case, but then Borstein dies from a fatal epileptic seizure, seemingly caused by Bella through rapidly cycling images displayed on Borstein's monitor. Sherlock finds a

A severed hand is seen in a street puddle. It belongs to the corpse of Orthodox Jew Moshe Shapiro. Shapiro owned a Postal Unlimited store nearby. A hidden safe contains Moshe's ledger. Moshe turns out to have been a diamond smuggler. Sherlock deduces that weightlifter Dana Kazmir ripped the hand off. Kazmir confesses to the murder and provides a list of three other people he was supposed to kill, which includes Amit Hattengatti, the store's only employee. The NYPD intercept a cash payment to Kaz

Joan returns from Denmark. Kitty is called to a museum, where valuable old maps and a security guard are missing. The guard is dead. One particular map was the target; the rest were taken just to camouflage that fact. That map, "The County of King James, Virginia, 1794", was loaned to the museum by a now-deceased member of the Bray family decades before. The family's charitable organization still exists, and is run by Margaret Bray. The thief is ex-cartography student Stuart Zupco, who turns up

Joan's new client wants to find out about her sister, Jessica Holder, who disappeared five years before. The smell of nutmeg was detected at the site of Jessica's disappearance and those of others. Noah Kramer, a married lawyer with whom Jessica was having an affair, told her that his client, Raymond Carpenter, was guilty of several murders; she was going to tell the police. In Sing Sing, Carpenter admits that he outsourced her murder, but the killer is now dead. A new crime scene with the scent

Flynn, a Highway Patrol officer, is murdered; his sidearm had been replaced with an airsoft gun. Flynn was a drug addict. He stole guns from the police department's Rodman's Neck Armory, replacing them with airsoft guns, and sold the real weapons to fund his addiction. His buyer, Buros, a wanted arms dealer, already had buyers lined up for the prized military-grade police weapons, but Flynn, now clean, refused to obtain more for him. Buros killed Flynn, as he would be given an inspector's funera

A nurse Joan knew is missing. The woman's trail leads to an illegal human drug trial of EZM-77, a time-dilating substance. Five test subjects were injected. The higher the dose the madder they went (one killed the missing nurse, who administered the drug) and they die or are murdered. Carlisle, on the lowest dose, survives and his interview leads to Purgatorium, a company which paid the test subjects $150,000 up front and promised the same amount every year. The drug's inventor, Dwyer Kirk, take

An elderly couple dies in bed. They are inadvertent casualties of another crime committed elsewhere in the building. Someone burned rubber in the basement, which emitted a toxic gas. Sherlock finds a burned body with a tire around his neck. Clay Dubrovensky was the second floor tenant who worked for the criminal SDS Cartel, growing marijuana for them. A valuable orchid, the last of its kind, grows in the greenhouse. Barbara Conway, from AgriNext, bought an orchid from Clay. Sherlock examines bot

A woman is murdered, and her premortem back scars resemble Kitty's. A burner phone left at a bar the woman was at leads the NYPD to a suspect, Simon de Merville. Simon works for a brothel that kidnaps illegal immigrants, and in his property is the body of one of the brothel's suppliers, as well as women captives. Simon might have been injured during the lethal confrontation with the supplier and went to his sister Violet for assistance. Kitty beats Violet into cooperating with the NYPD. Violet c

Del Gruner abruptly fires Joan. Sherlock begins exploring the backgrounds of kidnapped and murdered women who match Gruner's modus operandi. They track down Tabitha Laird, a coworker of Gruner's at a charity to which he donates his time and money. Laird's adopted son turns out to be the child of Gruner and one of the victims on Sherlock's list. Kitty secretly captures Gruner, unaware of the evidence tying him with his crimes. She prepares to kill him and dissolve his body using a corrosive liqui

The wife of missing lawyer Steven Horowitz hires Sherlock to find him. Sherlock and Joan discover that he did not tell his wife he had been fired by his firm. They find out that he went to work for a debt collection agency and was given a debt package worth millions. Sherlock and Joan try to narrow down the pool of suspects from the thousands of debtors. It turns out that Horowitz had a change of heart after seeing the hardships suffered by the debtors and forgave what he had not yet collected.

Elana March tells Joan she had Andrew murdered in revenge. Sherlock enlists Detective Bell to help him find two missing pregnant zebras stolen from a zoo. A trademarked color provides the first clue; the color is only used on delivery vans for one company. They eventually find the zebras, who have given birth. They also find a veterinarian, shot dead; he was forced to help with the induced premature births. They later find a quagga, which went extinct over a century before. The zoo's staff are g

Sherlock and Joan investigate two murders in which the killer leaves envelopes of cash on the victims equating to their "worth". The probe leads the two to investigate an airline crash which killed over 80 people and the amount that each would receive as wrongful death compensation according to an equation formulated by attorney Arlen Schrader. When Dana Powell, the wife of one of the crash victims, reports being shot at from her back yard, Sherlock becomes suspicious, as the first two shootings

A woman named Maria Gutierrez vanishes in 2011. Her body is found three years later. Sherlock wrote a signed note found in her purse, giving his address and a meeting time, but says that he does not know her. However, he was a heavy drug user then, which caused blackouts and memory loss. Maria worked as a cleaner at the offices of Councilman Robert Barclay. Junkie Oscar Rankin knew Maria and had boasted of knowing Sherlock. Maria met with Sherlock and brought bloodied clothes belonging to Barcla

A distracted driver is killed after colliding with a van and discovering that it carries corpses. The driver's body is partially mummified, by the coolant R22. Sherlock's investigation leads to a cryogenics facility owned by a cash-strapped company that preserves the bodies of clients in the hope that future advances can revive them. There, the corpse of strangled psychiatrist Jim Sullivan, has been stolen. New patient Vance Ford provided a sketch of the murderer. Ford, however, is lying. Later,

Galen Barrow, a driver for ridesharing company Zooss, is run over by a city cab. The murder was staged to look like professional rivalry. Barrow was an internet journalist and had begun working for Zooss recently. Registered sex offender Gordon Meadows admits to having killed Barrow; he was blackmailed into it after he broke his parole. Barrow's internet journalism employer, Lydia Guerrero, was having an affair with Barrow and was also being blackmailed by an anonymous texter. Despite her opposi

Everyone member "Species", real name Errol White, is killed by a now-missing samurai sword. It is later revealed that Species was secretly two people, an arrangement that allowed Species to always be online. The other half of Species is someone named Bradley Dietz. Dietz killed White when he rejected Dietz's idea of hacking think tank the Atherton Foundation, feeling that it was too dangerous. Dietz is capitalising on Everyone's sympathy for Species's death to gain power, and the hack is imminen

Debunker Garrison Boyd is killed. Boyd accused real estate developer Collin Eisley of trying to scare a woman into selling a beach house, as she was hearing unusual noises. This was actually the result of tunneling from a neighbor's house. The tunnel's target is Ruby, the world's fastest transatlantic internet cable. Ruby feeds certain investment firms. The digger is Nadim Al-Haj, an Iraqi man. Nadim eventually torches his apartment to destroy evidence and flees. Data went into a device there an

A man shoots two paramedics and steals their ambulance with patient Maggie Halpern inside. A man named Wallace Turk later admits the murders. Halpern is also murdered, and her body is eviscerated by Turk's partner. Halpern was an unwitting drug mule who had received what she thought was normal surgery in Brazil. Her surgeon, Turk's brother-in-law, planted heroin inside her, then vanished. Drug gang leader Janko Stepovic uses the offices of dentist Dr Marty Ward. Bell tells Janko that if he buys

Judge Dennis Vaughn is killed with a screwdriver. While in New York City for a fundraiser for a governor's re-election, Vaughn had sex with one of the governor's staffers; her alibi depends on a friend, Andrea Schuster. Fingerprints on the screwdriver belong to Nikki Moreno, who escaped from a correctional facility days earlier. At the for-profit prison, run by Reform Enterprises (RE), Deputy Warden Trey McCann says that Moreno was a troublemaker. Later, McCann is murdered. Jeff Harper, a prison

Testing to learn the cause of Colony collapse disorder (CCD), USDA employee Everett Keck visits Belinda's honey farm. Keck and her bees die from cyanide in his smoker. AgriNext might be behind CCD in Northeast USA. AgriNext's company executive denies murder, saying that they had been ready to counter Keck's accusations by discrediting him. Belinda's neighbor, Darryl Jarvis, had filed a complaint that Keck poisoned his bee hives with deadly mites. Jarvis actually murdered Keck. Mites did appear w

Oscar Rankin kidnaps Alfredo to leverage Sherlock into finding Oscar's missing sister Olivia, a fellow drug addict. Sherlock searches for Olivia with Oscar, visiting his former rehabilitation center and an active heroin den. At the den, the discarded contents of a stolen wallet contain the driving licence of Jonathan Bloom, a sexual predator who lures with heroin and is believed to have killed two women. Sherlock tortures Bloom into admitting that he took Olivia but she fought him, stole his mon