- While Kitty tries to find a runaway teen, Sherlock and Joan work a case in which the murder of a brilliant bioengineer looks to be at the hands of a drug cartel. Also, Joan makes a major life decision but worries it will impact Sherlock negatively, not knowing that Sherlock has big news of his own.
- After Kitty's group rape survivor session, a woman named Miranda approaches her for help finding her daughter Tess, who's been missing for three days. Tess recently learned that she was the product of her mother's rape and started acting out.
At a crime scene, Holmes and Watson observe an elderly couple who died in their bed at the same time. Holmes sniffs the air vents and announces the Kellys are the victims of a crime committed elsewhere in the building.
He leads Watson and Detective Bell to the basement, saying he think they died of burning rubber fumes. They find a charred body next to the boiler.
He's identified a Clay Bubrovensky, the brownstone's other resident. He has degrees in botany and genetic engineering. Watson thinks he looks like "Point Break" and "Magic Mike" had a baby.
Clay was living off an inheritance but the way he was killed seems like the cartel: "necklacing," fill a tire with gas, put it around the victim's next and light it on fire. There have been ten similar killings in New York in the last five years, all due to a Brazilian cartel.
At the station, they interview Clay's ex, Courtney, who says they recently started hooking up again. Clay had bricks of cash and growing supplies, so Holmes deduces he was a grower for the SDS cartel. The ex says Clay engineered pot for them but recently wanted a real lab and better supplies.
Back at the brownstone, Kitty says she's spent all day following up Tess and has only determined that Tess was a brat who will probably return when she's ready. Kitty asks about Watson in a way that sets off Holmes' Spidey sense.
The next morning, Watson is woken up by Holmes in her kitchen making smoothies. Holmes has located Clay's grow house in Brooklyn, based on large electricity usage and the Russian coins he likely got from the nearby Brighton Beach neighborhood.
Holmes asks Watson what she wanted to talk about yesterday. She takes a deep breath and says she's going to go work for a private insurance company, as one of their in house investigators. She says she'll still have time to work for the department. Holmes seems dumb founded.
Holmes gets a text from Captain Gregson and he and Watson show up at the grow house and find hundreds of dying marijuana plants. They wonder if the fact the cartel is letting them die means that the cartel doesn't know Clay is dead.
Holmes brings up an extremely rare orchid worth $250,000 that was stolen from a flower show just over a year ago. It's in the next room.
Back at the station, Holmes has decided Clay was killed over the orchid not marijuana. The autopsy found Clay was killed before he was lit on fire.
Holmes suggests Clay could have bought the flower on the black market online. People put high value items in photos with everyday objects and the sellers bid low dollar amounts with added zeros implied.
At the brownstone, Kitty gets a visit from one of Tess' classmates, Lexi, who says Tess thought a white Jaguar was following her recently. She gives Kitty the license plate.
Meanwhile, Holmes and Watson visit Agrenex, an agribusiness company. They found record of Clay selling the orchid to Barbara Conway on his computer. Conway admits she bought the bureau in the online posting from someone, but has never heard of Clay and says he threw the flower in for free. She takes them to the conference room and shows them the bureau and the orchid.
Kitty and Gregson talk to the driver of the white Jaguar, a middle aged man named Grant Perryman who is annoyed and indignant. He says he was with his son in Baltimore at the time Tess said she saw his car. Kitty notes something odd about his thumb as he leaves.
Kitty doesn't think the man took Tess, but he does think he knows how to find her.
Back at the brownstone, Holmes is befuddled by the existence of two of an orchid that is supposedly the only one in the world. He has two bags of homemade plant food from Barbara Conway. One reeks of coffee and fish and Holmes says it's clearly for another plant. Holmes examines the orchid's root systems and says they are young and identical and he and Watson presume Clay found a way to clone the orchid.
Later, Holmes musters up a congratulations to Watson and says he's been considering a change of his own. But Gregson calls before he can go on.
There were two more necklace murders on the lawn of Agrinex, and someone wrote "this means war" in Portuguese on a nearby sign.
Later in the morgue, the victims are ID'd as William Keller, Agrinex CFO and Nelson Shelby, one of their Board of Directors. They were grabbed outside their homes last night. Agrinex claims to have no idea why they were targeted, but Holmes doesn't buy it.
A witness saw a Hispanic male in the area at the time of the murder. Holmes notes the rope used to tie the victims is rare and made to withstand fire. But it wasn't use on Clay and Holmes wants to go back to Barbara Conway.
Later in Gregson's office, Conway admits that she bought the orchid from Clay but was impressed by the cloning. She tracked down Clay and offered him a job, then she found out about his cartel ties. But Agrinex is prepping for medicinal marijuana and only wanted to hire him more. The cartel wouldn't let him go without a buy-off of $10 million. The company countered at $5 million.
Clay called Barbara the night he was killed and told her he was going to tell the cartel he was going to work for Agrinex. Barbara is sure the cartel is responsible.
Kitty tracks down Tess in her friend Lexi's aunt's apartment. She knows that the Jaguar driver, Grant Perryman, is her mother's rapist -- her father. Grant got her mother drunk and attacked her and then his rich family bought her mom off. Kitty put it together because both Grant and Tess have odd toe thumbs.
Kitty understands that Tess wanted to expose Grant and make him pay for it, but she points out that Tess' mother doesn't deserve to have to relive everything.
At the brownstone, Joan reviews Agrinex memos and thinks Barbara Conway was likely telling the truth.
Holmes brings up the change he wants to make, moving Kitty from protégé to partner. Watson says it's a great idea and Holmes says they can still work together.
Gregson texts, they caught the man responsible for killing the Agrinex executives by tracing the rare rope. He's confessing now, but not to Clay's murder.
Watson suggests that maybe it wasn't the cartel Clay was going to ditch, but Agrinex, and maybe they killed him and framed the cartel, then two executives were killed by the cartel in retaliation.
Watson gets a text from Clay's ex-girlfriend to meet her at Clay's apartment. She wants to get inside to get special food Clay made for her engineered yellow flower. Courtney says Clay gave the flower to all the girls he hooked up with. Watson recognizes the smell of coffee and fish.
Watson checks in with Holmes and announces Conway killed Clay.
The next day at the station, Watson sits down with Barbara and confronts her. Watson thinks she was seeing Clay and got angry when she found out he was sleeping with his ex. After not too long, Barbara confesses.
At the brownstone, Holmes gets a call from Gregson to come -- alone -- to a murder scene. The victim is Melanie, a 24-year-old who went missing a few days ago. She was kept alive until last night then dumped. She has deep triangle-shaped wounds on her back -- the same ones Kitty has. The man who hurt her is in New York.
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