Season: Four — Episode: 24 Director: John Polson — Writer: Jason Tracey — Aired: May 8, 2016 — Viewers (millions): 5.46 Summary: Vikner's diabolical maneuvering to secure his position becomes known. Sherlock concocts a plan to unseat him only to unwittingly enable a power struggle, the ends of which he could barely have believed possible.
At The Brownstone, Watson hangs back while Sherlock moves close to a planted bomb. Indicating the bomb has a remote detonator and they are safe as no one saw them enter, he rips the detonator off and disarms it. Knowing that Moriarty has a rule that he and Watson aren't to be harmed, he suspects that Joshua Vikner isn't behind the bomb. Having seen a light on in a unit across the street which he knows is unoccupied, he and Watson head there. Discovering the unit empty but that there are signs someone had recently been there, Sherlock deduces that someone within Moriarty's organization planted the bomb in the Brownstone to frame Vikner and bring about his demise. Sherlock proposes finding who is behind the framing and allying with them against Vikner. Detective Bell calls that the head of Morland's security team, Christopher Gray was found beaten up and unconscious near the Brownstone and is in hospital.
You and I are untouchable.
At the hospital, Gray won't answer Sherlock and Watson's questions but Sherlock deduces that he was in the unit across from the Brownstone. After seeing a man break in and plant the bomb, Gray chased and fought him. Thanking him for saving their lives, Gray still won't cooperate and has a nurse make them leave his room. Telling Watson to remain at the hospital, Sherlock heads to a church undergoing renovations, having seen plaster dust on Gray's coat. At the church, Sherlock finds Morland and his men standing over the body of the bomb planter. Indicating he doesn't know the man's identity, Morland says he's done pursuing vengeance and will follow Sherlock's plan to bring down the head of Moriarty's organization. At the Brownstone, Sherlock shows Watson that the bomb planter, Nasim Behzadi, was the driver of the deputy head of Iran's U.N. mission, Zoya Hashemi. Deciding to accept Morland's help, he proposes they meet her.
I didn't do it.
Arriving at Zoya's heavily guarded country mansion, she drops all pretences and admits to planting the bomb in order to frame Vikner. Desiring a change in leadership, she knows that an attempt on Sherlock or Watson's life would result in Moriarty eliminating Vikner. Sherlock says they want to bring down her entire organization which Zoya responds to derisively and takes them to a room with a large monitoring board. The board shows agents or organizations in over half the countries of the world serving Moriarty, much too large to destroy. She indicates that when Moriarty was imprisoned, she and others proposed an alternative to Vikner to replace her. Sherlock deduces Zoya wanted Morland to take leadership and this was the reason for the attempt on Morland's life which killed his lover, Sabine. She declines forming an alliance with them, knowing Vikner will attack her if he perceives a threat to his power.
Framing the professor with your deaths was my only chance.
Lee Dewyze - Again plays at episode end as Sherlock and Watson visit Morland's penthouse safe house and he tells her that he owns it now and thinks she should move in. Watson refuses and understands the danger of working with Sherlock.
In an attempt to frame Vikner for murder, Sherlock and Watson delve into the criminal past of Arthur Tetch and mention the DANTE survey. ("The Invisible Hand")