- Sherlock is called in on a case and immediately recognizes the work of an old foe from Britain. Sherlock sees it as a chance at redemption in catching the man, but first he needs to control his own emotions about the murderer.
- For once, all the NYPD asks for precise instructions from Sherlock when M, the mysterious killer he couldn't catch in London due to his addiction, resulting from his beloved being murdered, starts his signature killings all over New York. After a corpse is left in his home, Sherlock sets a trap and catches the fiend, hell-bent on illegally merciless revenge, but is made to doubt by an apparently substantiated copycat claim.—KGF Vissers
- Open with a man watching English soccer while assembling a tripod. He attached a hook to the feet of a bound and gagged man and raises him off the ground. He appears to reach for his throat as we cut away.
Holmes and Watson talk about the fact the end of her work with him is at and end. She is working on a final assessment for his father.
Gregson brings Holmes and Watson to a crime scene. It is the home of a CPA named Vickers. There is no body, just an enormous pool of the man's blood. Holmes analyzes the scene with typical precision, then tells Watson he's followed this particular madman in London.
Holmes tells the police department the person they are looking for is called "M." He says M is the most "sinister taker of lives" he's chased. M has killed almost 40 people in the past decade. He has not been photographed and has no profile. He drains his victims and dumps their bodies in the ocean. M kills in bunches.
Watson asks Holmes why he seems to be so chipper. He tells her this is a second chance for him to bring a ruthless killer to justice. Holmes tells Gregson that M has referenced him in a letter or two, so a protection detail is provided. Holmes tells Watson he needs to get used to working by himself and will keep her updated via email.
Watson assures her therapist she has no interest in becoming an investigator.
We see M unemotionally part ways with a hooker. Afterwards he gets a text in some sort of code and begins working on a letter.
Holmes and Watson analyze Vickers' body, which has finally washed up. Based on the oil in his hair Watson guesses he was dumped near the navy yard. She tells Holmes she going to miss "this. Working with you."
Holmes and Watson return home to find a letter from M on the table. It is M's usual rambling nonsense, telling Holmes he is a "mouse chasing a lion." M got by the police by picking the lock on the back door. Watson isn't worried about M trying to hurt him. Holmes says she's going to stay there. Holmes is looking at one of his father's properties online, telling Watson he's thinking of moving. After Watson goes upstairs Holmes grabs a hidden camera and pulls up an image of M leaving the note.
We see M watching a woman going into her apartment building. A young kid tries to sell him some things by M pushes him away, eventually breaking the kid's phone.
While Watson works on her final assessment there is a knock on the door. It's an officer with the kid from the previous scene. The kid, Teddy, is a friend of Holmes and was instructed along with some of his friends to hang out near certain hotels looking for M. If he found him, Holmes was going to pay him several hundred bucks. Teddy shows her a copy of the picture of M from the surveillance camera.
Holmes arrives home later to find a very angry Watson. She's pissed about all the hidden cameras in the home. He explains to her how he figured out M would be at a certain chain of high-end expensive hotels. It has to do with his footwear and the shampoo he smelled on the letter, among other things. Holmes then teller her has no intention of going to police. M killed Irene Adler, the only woman Holmes ever loved. This led to Holmes slipping into drug addiction. Holmes plans to catch M, torture him and kill him. Holmes wants revenge and has been dreaming of this moment for quite some time.
Holmes meets Teddy and gets more information about M.
M grabs the woman he'd been watching earlier.
Watson goes to Gregson and tells him and tells him about Holmes' plan. She thinks it's possible Holmes may already have M.
We see Holmes sneak up on M and knock him out with a baton. Holmes takes M to a remote location and ties him up. Holmes makes it very clear what he's going to do. Holmes tells him about Irene and M initially doesn't seems to remember. M then recalls that there were a few copycat murders which took place while he was in prison for a fight. M, who served in the military, doesn't seem scared. Holmes doesn't believe his story and starts working on M.
Gregson and Watson interview M's recent near-victim. Holmes let her go as long as she didn't turn around. Based on the fact she saw powder on Holmes' shoes Watson thinks she knows which of Holmes' father's properties he may have taken M.
A bloodied M tells Holmes he's not a serial killer. He's an assassin who has been paid by an employer for all of his murders. He's never met his employer and occasionally receives coded messages. He says his name is Sebastian and tells Holmes to look up his case. He couldn't have killed Irene. Sebastian is furious that his employer played him for a fool.
Watson and Gregson close in on Holmes' location.
Sebastian wants to get even with his employer, someone called Moriarty. Sebastian assures Holmes he couldn't have killed his girlfriend. He tells Holmes that if he kills him he'll lose the best clue to find Moriarty. Holmes assures him that his is not an average man and sticks a knife in his stomach.
Police arrive and find the place empty. Holmes apparently walked into the station with a very much alive Sebastian
In questioning Sebastian tells police that he led Holmes to where they were and that his injuries were committed by Holmes in self-defense.
Watson tells Holmes Sebastian has confessed to all of the murders but wouldn't give him up. Holmes tells her Sebastian didn't kill Irene. He apologizes for lying to her. Holmes tells her "I'm going to miss this" and apologizes their last few days went so poorly. After he leaves she places a call to Holmes father, saying she'd like to stay on a little bit longer.
Later we see her get an email from Holmes' father. He doesn't wish to keep her on any longer. But Watson lies to Holmes, telling him his father agreed to have her continue the work.
The episode ends with Holmes staring at a wall. In the middle is a piece of paper with one word: "MORIARTY."
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