The Slough House Files spy duckTHE SLOUGH HOUSE FILES

Slow Horses · Series 6 · Episode 4

Lost and Found

“Lost and Found” turns the separate chases into a brutal calculation about expendable people. River and Sid need somewhere safe to stop; Lamb needs to know who is paying Harkness; Taverner needs a bargain that will protect her position. Those aims collide in an episode where a useful rescue can still end in an irreversible loss. The ordinary settings are part of its power: there is no grand battlefield to warn anyone that the worst moment has arrived.

Released
2026-10-07
Runtime
49 minutes
Source novel
Joe Country and Slough House
Director
Adam Randall

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Watch and read

Open the official programme page or explore the source novel.

Detailed plot

Reveal episode spoilers

Sid persuades a bowling-alley employee to let her and River use the telephone despite closing time. Jane arrives, kills the employee and fires on the fugitives; River is wounded in the hand. Coe helps them escape. A request for the simplest possible service has become another confrontation. They get away together, but escape gives them injuries to manage and the same unanswered question about where they can safely turn next.

Damien Cantor meets Natasha and makes clear his desire for a profitable contract. He subsequently tells Taverner to be ready for a telephone call. At the Park, Oliver Nash has investigated the Kazan death: the victim was a GRU agent linked to the Novichok operation. He challenges Taverner and arranges an oversight meeting. Money, public authority and private violence are being drawn into the same conversation, while Taverner can no longer control every person asking questions.

Lamb, Roddy and Reece arrive at Flyte’s home. They intend to draw Harkness out, but Reece pursues his own terms and arranges a Camden meeting. Lamb faces Harkness in a burger restaurant and learns that Harkness is not responsible for the attacks on his agents. Reece also turns up and is caught by Harkness’s hired men. Lamb creates a disturbance by smoking, gets himself and Reece outside and escapes with Flyte and Roddy. Following Harkness then leads them to Cantor.

Elsewhere, Catherine, Shirley, Louisa and Moira reach a refuge that turns out to be Taverner’s holiday home. River and Sid stop at a service station, where she treats his hand. They argue about Taverner again. Sid remembers that Taverner visited her in hospital; River sees the secrecy surrounding her recovery as a reason for suspicion. The same history produces two different loyalties. Neither can simply order the other to forget what that experience meant.

Taverner receives the promised call from Vassily Rasnakov. He demands Sid in return for ending the attacks on the other agents, together with safe passage for his assassins. That proposed bargain gives Sid’s search for assistance a terrible context. A superior who should offer protection is being invited to decide whose life can be traded away. The offer reduces individual agents to terms in a negotiation, with the threatened people absent from the discussion.

At the service station, Coe confronts Jim in the toilets. Their encounter becomes a knife fight that Coe does not survive. While River is occupied, Sid calls the Park from the car. Taverner has the call traced, and Jane reaches Sid. River finds Coe’s body and arrives outside too late to stop Jim and Jane taking Sid away. The escape party has been broken apart: one colleague is dead, another abducted, and River is left with the consequences of a call he tried to prevent.

Turning points

Reveal turning points

The opening murder strips away any comforting distinction between targets and bystanders. The employee is not involved in a secret operation, yet a small act of help places him in its path. That makes the location unsettling beyond the immediate gunfight: a public building has offered neither anonymity nor protection.

Lamb’s conversation with Harkness is valuable because it corrects an assumption. Personal history makes Harkness an obvious suspect, but an obvious suspect is not necessarily the explanation for every attack. Lamb listens closely enough to separate one criminal arrangement from another. His investigation progresses through that distinction rather than a spectacular confession.

Taverner’s bargain is the episode’s clearest expression of institutional cruelty. Saving several people by surrendering one might be presented as arithmetic, but Sid has no opportunity to consent to the equation. Her belief in Taverner’s concern makes the decision more painful. What Sid experienced as kindness becomes leverage that keeps her reaching towards the wrong telephone.

Coe’s death changes the rhythm of the final minutes. A character often defined by observation and silence acts directly, and the scene gives him no heroic rescue afterwards. River discovers the result rather than preventing it. The loss lands because the episode has shown practical competence without suggesting that competence makes anybody invulnerable.

Book vs show

Reveal book and television spoilers

Coe’s death comes from Joe Country (2019), but the screen places it within the wider Slough House (2021) assassination story. In the novel he faces one of Harkness’s operatives; the episode gives the fatal encounter to Russian assassin Jim.

Tom Brooke explained that the book’s conversation before the fight concerns mortgages and self-employment. Television substitutes pensions, retaining the unsettling ordinariness while changing the subject. Brooke also asked for the push knife to be included.

The adaptation joins Coe’s Joe Country ending to Sid’s Slough House return in a single service-station sequence. The combined timing makes River lose one ally while another is taken, rather than receiving those events through two successive novels.

Characters and actors

Tom Brooke and Kyle Soller make Coe’s encounter with Jim the episode’s most painful pairing. Cooke gives Sid’s trust in Taverner a personal basis, while Kristin Scott Thomas makes the cost of that trust horribly visible. Lamb and Harkness remain antagonists even when their conversation exposes another player.

Linked locations

The bowling alley and motorway service station turn familiar stopping places into traps. Camden supplies the restaurant meeting, and Taverner’s holiday home becomes shelter for Catherine’s group. The contrast matters: one group gains a private refuge while another loses the protection of a busy public stop.

Trivia

Brooke told Town & Country that he discussed Coe’s eventual death with showrunner Will Smith when he joined the programme. His final scene was therefore a destination for the performance, rather than a sudden decision made only after the character became popular.

Questions and answers

Does Coe survive the fight?

No. River finds him dead after his encounter with Jim in the service-station toilets.

Why does Sid keep trying to contact Taverner?

Taverner visited her during her recovery. Sid regards that personal attention as a reason to trust her, despite River’s objections.

Did Harkness order the attacks on Slough House?

Lamb’s meeting establishes that Harkness is pursuing the Nesmith matter rather than directing the attacks on the slow horses. The Russian demand supplies a different explanation.

Sources and credits