John Watson, Martin Freeman, sits in his first therapy session in eighteen months, trying to explain why he’s there, and he stumbles toward a devastating confession that frames the entire episode:
> "My best friend, Sherlock Holmes, is dead."
To understand how things spiraled there, the story rewinds to three months earlier, when Benedict Cumberbatch as Sherlock Holmes is riding high on a string of public praise. He has solved dangerous cases, recovered a valuable Turner painting of Reichenbach Falls, and helped Interpol trap a wanted criminal, all while a media circus swirls around him. The director of a project greets him with a wrapped gift, which Sherlock immediately deduces is a pair of diamond cuff-links—though he grumbles that he wears cuffs without buttons. The kidnapped banker’s son presents another wrapped gift, and Sherlock detects a tie pin, though he insists he does not wear ties. For the Interpol case, DI Lestrade offers a deerstalker cap as a present. The gifts feel like trophies and tests, all while Sherlock basks in attention that borders on fame.
Watson senses the danger in Sherlock’s growing notoriety. The press might turn on him, and the private detective’s days of quiet investigation could be over. So Watson counsels a low profile and a modest case to keep the spotlight from becoming overwhelming. Moriarty, ever the puppeteer, teases the edge of the crime world, nearly stealing the Crown Jewels to prove a point, then allows himself to be caught. He even brazenly taunts the security at the Bank of England and the Tower of London by exploiting his iPhone-powered tricks, all while work on the Tower burglary continues. Before smashing the Crown Jewels’ case, he writes the ominous words “Get Sherlock” on the outside to catch the cameras’ gaze, and then surrenders to the police wearing the jewels while sitting on a throne.
The tabloids explode with headlines about a “Crime of the Century,” framing a sequence of break-ins at the Tower, Pentonville Prison, and the Bank of England as the work of a single mastermind. A front door full of reporters and gawkers greets Sherlock and Watson as they head to court, and Kitty Riley, a sharp reporter, slips her business card into Sherlock’s jacket pocket while warning him that the press may soon turn on him and that he’ll need someone on his side.
In court, Sherlock testifies that Moriarty is a criminal genius who has threatened jurors into acquitting him. Moriarty has manipulated the system and the jurors through fear, claiming he can hack any bank, access nuclear launch codes, and wreak havoc—yet Sherlock cannot quite pin down the motive beyond Moriarty’s own desire to observe people and manipulate them for power. Moriarty casually admits that the break-ins were a publicity stunt designed to attract clients, confessing, “I owe you a fall.” A chilling line; the danger isn’t merely wealth or power, but the spectacle.
Meanwhile, Sherlock’s world is unsettled by the growing sense that someone is leaking his personal information. Mycroft, Mark Gatiss, unintentionally reveals details during interrogation with Moriarty, and those disclosures are weaponized to attack Sherlock’s reputation. Sherlock begins to notice a coded pattern—the anti-security code is hidden in the tapping of Moriarty’s fingers—and Moriarty’s aim is to corner him in a public collision.
The plot thickens as the team hunts for the source of the leak. They break into Kitty Riley’s home and discover Moriarty’s fake identity, Richard Brook (a.k.a. “Reichen Bach” in German), a ruse used to present himself as the mastermind behind every crime. With his cover now blown, Sherlock resolves to play a final gambit. He seeks help from Molly Hooper, Louise Brealey, a pathologist at St. Bartholomew’s, and confesses that he respects her and wants her assistance if he is to face Moriarty’s threats. Molly shares personal memories of her father’s death and the way people show happiness when others are nearby, offering Sherlock a rare chance to connect emotionally in the midst of danger.
As investigations pivot, Sherlock and Watson race to prevent further harm to a British ambassador’s children, Rufus Bruhl’s kin being abducted. Sherlock deciphers clues that help the police locate the children, but Moriarty has already manipulated events to mislead them, traumatizing one of the children to make her fear Sherlock herself. Sergeant Donovan, played by Vinette Robinson, grows suspicious, and the chief superintendent pushes Lestrade, Rupert Graves, toward making an arrest—only Sherlock escapes with Watson as a “hostage” during the confrontation. The world’s eyes turn toward the duo as they realize Moriarty’s “Get Sherlock” message has convinced the underworld that Sherlock is compromised and that the password to bypass security might exist.
In a tense pursuit, Sherlock and Watson infiltrate Kitty Riley’s newsroom and uncover Moriarty’s manipulation: the “master criminal” Richard Brook is just a front, and Moriarty has crafted a narrative designed to crash Sherlock’s credibility. With the trap closing in, Sherlock leaves John and seeks Molly’s help once more, admitting he knows someone betrayed him and that he is in grave danger. He also learns that Mycroft inadvertently disclosed sensitive information during earlier interrogations of Moriarty, a revelation that helps explain the public onslaught against him.
The final gambit hinges on Sherlock’s plan to erase the threat and outwit Moriarty once and for all. He arranges a rooftop rendezvous at St. Bartholomew’s Hospital, inviting Moriarty to face him one last time. Moriarty’s ultimatum is brutal: either Sherlock commits suicide, or Moriarty’s hitmen will finish the job for him, targeting John, Mrs. Hudson, and Lestrade. Sherlock, recognizing the deadly trap, feigns acquiescence but refuses to surrender. The two men acknowledge a profound similarity, and Moriarty swears that as long as he lives, Sherlock will be tested by danger. Then Moriarty overwhelms Sherlock with a choice that cannot be undone and ends his own life, saying, “As long as I am alive, you can save your friends.”
The moment of triumph is also a moment of tragedy. Sherlock calls John, explaining that the call was his “note” and leaps from the hospital roof, a decision that leaves John and Mrs. Hudson reeling with fear and grief as Sherlock’s body is carried away. John, stunned and heartbroken, watches as a cyclist knocks him to the ground before he reaches Sherlock’s side. The story returns to the therapy room, where John remains unable to open up fully, and Mycroft stands over The Sun, a tabloid revealing the headline “Suicide of Fake Genius.” Later, John visits Sherlock’s grave with Mrs. Hudson, affirming his faith that Sherlock is not truly gone, and then, in a quiet, haunting final beat, Sherlock is shown watching from a distance before stepping away again, leaving a sense of unresolved absence and the enduring bond between two friends.
The episode ends with the quiet ache of memory and the suggestion that the enigma of Moriarty—the man who could “solve” anything—has finally died with him, but the friendship between Martin Freeman and Benedict Cumberbatch remains, a knot of loyalty, fear, and genius that survives even the darkest hour.
