The Slough House Files spy duckTHE SLOUGH HOUSE FILES

Slow Horses · Series 5 · Episode 4

Missiles

Two political rallies give Lamb’s team two possible targets and no dependable way to know which one matters most. “Missiles” makes the question of protection unstable. Watching somebody is not the same as understanding what you see, and getting close enough to help can introduce a danger nobody planned.

Meanwhile, Roddy’s attachment to Tara remains useful to the people investigating her. Flyte approaches him through the story he wants to preserve, while Lamb follows the practical traces Tara has left behind. Their methods briefly align. The field teams have less luck finding the same clear line between their intentions and the result.

Released
15 October 2025
Runtime
39 minutes
Source novel
London Rules
Director
Saul Metzstein

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Watch and read

Open the official programme page or explore the source novel.

Detailed plot

Reveal episode spoilers

Flyte persuades Roddy to telephone Tara. He still wants to believe she was forced into betraying him, and Flyte allows that belief to make cooperation possible. Roddy attempts to warn Tara before ending the call, but the trace has already worked. The system needs less time than he expects. His technical confidence once again overlooks something that other people know and he does not.

Lamb reaches Tara’s address ahead of the Dogs. She has already left, but her taxi journey offers another trail. He discovers that she has gone to Roddy’s flat, choosing a place whose owner is currently in custody. Flyte reluctantly accepts his help. When Tara flees from the flat, Lamb is waiting on the route out and catches her with his car door. He gains the chance to attend her questioning by supplying the result the Park needs.

Whelan visits Dennis and Dodie Gimball after learning that Dodie intends to expose his encounter with an escort. He does not arrive to apologise. MI5’s files have given him damaging information about both of them, and he uses it to threaten their public reputations. The people trying to intimidate him now have reasons to be afraid themselves. His position supplies the leverage his ordinary manner fails to advertise.

At Jaffrey’s rally, Shirley notices boots she associates with the earlier attack on Roddy. Their wearer enters as a maintenance worker, claiming there is a problem with the lights in the women’s toilets. Later, the working lights expose the excuse. Catherine sees movement near the position from which the man can shoot the mayor. She throws a bottle towards the stage, prompting security to move Jaffrey before the gunman can fire effectively. Shirley attacks the man, but he escapes to the waiting van.

River and Coe are watching Gimball at the other venue. Coe seeks a vantage point while River finds the politician arguing with Tyson Bowman, Jaffrey’s aide. Tyson has come to ask him not to exploit Irfan’s involvement in the sabotage. Gimball responds with abuse, and the exchange becomes a fight. River intervenes on the assumption that he is protecting his assigned target. He drives Tyson away, but cannot stop the scene taking another turn.

As Coe comes down from the scaffolding, a tin of paint falls onto Gimball’s head. The injury kills him. What began as protection has ended with the death their wider assignment was supposed to prevent. River and Coe find the politician’s dictaphone, which has recorded the encounter, and leave with it. Their colleagues have stopped an assassination elsewhere, but they now carry evidence of a disaster with no safe explanation.

Turning points

Reveal turning points

Roddy’s failed warning is a neat reversal of expertise. He knows how tracing used to work and mistakes that knowledge for control over the current situation. Flyte needs neither to win his affection nor to persuade him that Tara is guilty. She only needs his belief to keep him talking long enough. The scene separates knowing a system from keeping up with it.

Catherine’s bottle is the opposite kind of intervention: unglamorous, immediate and effective. Its value is that it changes the behaviour of the people around Jaffrey before an explanation can be delivered. Shirley then tackles the physical danger. The two women work through different opportunities, making protection a series of practical choices rather than a heroic pose.

The paint tin changes the episode’s moral and political scale. River’s earlier mistake is recognisable as an attempt to help, yet good intentions cannot make the resulting death harmless. Coe’s lack of visible panic gives the closing scene its strange rhythm. The pair have to decide what to do before they have properly absorbed what happened, and the recording means that the moment cannot simply vanish with their departure.

Book vs show

Reveal book and television spoilers

The political map in London Rules (2018) differs in three concrete ways. Gimball has ambitions for Number Ten in the novel, whereas television puts him in London’s mayoral contest. Jaffrey’s book campaign is in the West Midlands; on screen he is London’s incumbent. Bringing the opponents into one election makes their protection part of the same immediate contest. Gimball’s compromising secret also changes. Herron’s politician conceals his cross-dressing, while the adaptation gives him a Turkish father. The television revelation directly contradicts the ancestry and immigration rhetoric on which he builds his public identity.

Characters and actors

River’s urgency and Coe’s stillness are put beside each other without turning either into an easy answer. River acts quickly but misreads a confrontation. Coe finds the vantage point but becomes part of the accident. Shirley and Catherine achieve their aim through observation and interruption, while Whelan demonstrates how much power somebody apparently flustered can exercise when he chooses to use the files at his disposal.

Linked locations

The action moves between Tara’s hiding places, the Gimballs’ home and the two rally venues. Each is a different kind of protected space: a private refuge, a household guarding its secrets, or a public platform that invites danger along with an audience. The two rallies create separate sightlines and escape routes, making the teams’ assignments difficult to coordinate from a distance.

Petticoat Lane: Slow Horses filming location

Trivia

Tom Brooke told TheWrap that the closing sequence was filmed across several nights. A later pickup involved rebuilding the scaffolding elsewhere in London. He also recalled Jack Lowden being covered in yoghurt for the scene, a practical detail behind the apparently spilled paint.

Questions and answers

Which candidate was the planned assassination target?

The gunman goes after Jaffrey. Catherine’s intervention and Shirley’s attack prevent him completing that attempt.

Does Coe shoot Gimball?

No. A paint tin falls as Coe moves down from the scaffolding and strikes Gimball on the head, killing him.

Why do River and Coe take the dictaphone?

It contains a recording of the encounter. Removing it gives them possession of evidence that could expose their part in Gimball’s death.

Sources and credits