- When dominatrix friend of Sherlock's finds her client dead, Sherlock determines that he had been poisoned.
- A businessman is found dead in a staged accident with an S&M dominatrix who happens to be Sherlock's old innocent friend. He actually died from poison which may have been administered by the nanny. Holmes recognizes her as once a star in a high-profile trial, after which she disappeared and changed her identity to shake off the sticking odium.—KGF Vissers
- "Elementary" - "Poison Pen" - Oct. 17, 2013
A wealthy older man is found dead in his home duded up in a leather bondage suit. He is found by a dominatrix who said he was a new client. She calls Sherlock for help. Holmes happens to know her. They quickly dismiss her as the culprit when Sherlock deduces the man, Titus Delancey, was poisoned by nitro glycerin, likely by someone he knew, who knew he was taking it for a heart condition.
When they start looking into the suit that he was wearing they figure someone bought it to make it look like the dominatrix did it. They look into it and find that his business partner in fact did put Delancey in the suit to embarrass him and also trigger a moral clause in his contract which would deny Delancey's family a $125 million payout. He did not, however, kill him.
They start looking into Delancey's family and Sherlock recognizes their nanny Anne from a strange connection. As a teenager, when she was known as "Abigail" she was accused of poisoning her father. She claimed, even though he was abusive to her, that she did not do it. She was acquitted but she was highly scrutinized before she disappeared. An odd teenager, Sherlock became her pen pal, but they never met in real life. Although she had gotten plastic surgery to obscure her appearance, Sherlock still recognized her.
Of course, suspicion then falls on Anne/Abigail. Gregson brings her in for questioning. But eventually lets her go with no evidence. Sherlock doesn't think she did it, that someone else recognized her and framed her for the murder. Although he does believe she killed her father. He never said anything because although she killed her father she wasn't a "killer."
He goes to see her at her home-- which is now surrounded by the media-- reveals who he is her former pen pal "Shawn Holmes," and says he wants to help her.
New evidence comes in: Titus Delancey's wife had a PI poke around her husband's life because there was also a clause in her prenup if she caught him cheating she would get a bigger payment. He wasn't cheating but she discovered who Anne/Abigail was. She let her stay in her home and be her nanny after that, they think to frame Anne/Abigail. It turns out that she was plotting to kill to her husband but she didn't. She was only "considering" it and was planning to blame Anne/Abigail. She didn't actually do it. So her statement to the police is she couldn't have killed her husband because she was meeting with a doctor to buy nitro glycerin because she was considering killing her husband.
Sherlock and Watson's attention turns to the Delancey's two sons who now stand to inherit a fortune. They go to talk to the kids after their father's memorial service. The elder son says he didn't kill his dad but that Anne/Abigail did. He says they got in a big argument which he recorded on his phone. Sherlock goes to her and says Titus had accused her of stealing. She had not. He tells her that he knows she poisoned her father. She kicks him out.
In investigating Delancey's office, Watson discovers a fake vent. Inside it is a very real iPad that has horrific images on it: Delancey sexually abusing his elder son Graham.
When they bring him in, Abigail saves him by saying she did it. She tells Sherlock that she never paid for her original crime so she will pay for this one and save Graham.
Sherlock goes to see Graham and tells him he'll be watching him. And also adds that if he ever needs to talk, Sherlock will be there for him.
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