Moriarty's plot involves kidnapping the daughter of a Greek businessman nicknamed the 'Narwhal'. Holmes has interfered with a plot she has in NYC and tells him to let her win, or she will hurt him. She reveals herself to be Moriarty and details how she tricked him back in London.

Later, when one of her assassins, Isaac Proctor, who has gone rogue attacks Sherlock, Irene saves him by killing Proctor. ('The Proctor') After Sherlock sees a mole missing on her back, he figures out that she may have been faking her death to begin with and suspects her of working for Moriarty, causing Irene to angrily abandon him. When someone breaks into his house and leaves a flower at her bed as a supposed threat, Sherlock takes her to a safe house and plans to elope with her. Moriarty leads Sherlock and Joan Watson to a mansion in Brooklyn, where they find her as Irene, alive. ('Risk Management.'Īppearing as if she has been held captive, and very convincingly faking symptoms of PTSD, she is checked into a hospital and eventually moves in with Sherlock under his care. Sherlock vows to bring down Moriarty and avenge Irene. He offers to give Holmes as much information on Moriarty as possible to get revenge for the betrayal. Moran knows he was in prison when Irene's murder happened, and concludes Moriarty 'killed' her and framed him, having never met Moriarty. Sherlock interrogates Moran, believing he killed Irene Adler because the scene of her 'death' had the same M.O. Moriarty is first mentioned when Sherlock captures the assassin Sebastian Moran who was killing on behalf of Moriarty using a serial killer's M.O. She seduced Sherlock so she could study him and finding he wasn't a threat to her other operations, she staged Irene's death, and resumed her business as Moriarty. Moriarty's passion for art is one of the few characteristics she retained as Irene. As Irene, she was an American in London who restored historic paintings, stealing some so that she could properly preserve them, which Holmes chose not to report her for. Intrigued by his deductive abilities, which she compared to her own, she created the identity of Irene Adler and arranged for him to visit her. When Holmes interrupted several of her planned assassinations in London, Moriarty at first considered killing him. However, she is perfectly capable of operating alone as she hunts down and kills her various rogue agents single-handedly. Despite her extremely ruthless nature, Moriarty kept close track of her daughter. Sherlock notes that Moriarty seldom involves herself directly in her operations, since she is the head of her crime syndicate and it poses a risk. After giving birth, she arranged for the baby (Kayden) to be adopted by the Fullers, a wealthy infertile English couple who later moved to New York. Before she met Sherlock, Moriarty had a brief affair with Joshua Vikner and became pregnant.

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