‘Slow Horses’ Season 6 Episode 4 Recap & Ending Explained: Diana Taverner’s Deal Puts Sid in Russian Hands

The latest ‘Slow Horses’ recap begins with a hunted trio and ends with one of them dead, one of them taken, and a conspiracy that finally has a name attached to it. The episode, titled “Lost and Found,” arrived on Apple TV on October 7. The ending explained question carries more weight than it does in most weekly installments.

Olivia Cooke’s Sid Baker is back in the middle of the danger alongside River Cartwright and J.K. Coe, while Gary Oldman’s Jackson Lamb tries to work out who Frank is working for. Those two storylines collide in the final stretch, and the result reshapes the rest of the season.

Sid Baker and River Cartwright Face the Hit Squad Again

River, Sid and Coe shelter in a bowling alley, where Sid is determined to reach Diana Taverner. Getting to a payphone proves absurdly difficult, so Sid invents a story about searching for her brother to win over the employee.

Jane catches up, kills the cashier and opens fire, and River is shot in the hand before the group drives away. While Sid patches him up, River is shocked to learn that Diana met with Sid in hospital after telling everyone she was dead.

Sid holds on to that connection because Taverner contacted her during her hidden years, which makes Diana one of the few links to her old life. That history explains why River’s warnings do not land.

The tone stays recognizable throughout. One review points to the show’s dry habit of making serious situations faintly ridiculous, from a desperate weapons purchase that produces a single gun to a payphone becoming crucial again.

Diana Taverner’s Russian Deal and the Kazan Fallout

A conversation between Diana and Vassily confirms that she used Sid Baker’s name to have a GRU agent killed in Kazan. Vassily wants revenge on the MI5 agent he believes was responsible.

Diana is coerced into agreeing to hand Sid over in exchange for a promise that no other agents, including Slough House workers or Dogs, will be killed. Vassily also explains that he owns Damien and, by taking Damien’s money, effectively owns Diana too.

The cruelty of the arrangement shows once Sid finally gets through. When her call arrives, Diana orders it traced and dropped.

Jane then pulls Sid out of her car while she is trying to contact Diana. Jim joins the struggle, the assassins overpower her, and they drive off in Coe’s car.

Is JK Coe Dead After the Shopping Centre Fight

Coe spots Jim entering a bathroom and follows him, and their knife fight produces one crucial answer, that Jim is GRU, Russia’s military intelligence service. It is a costly piece of information.

River discovers Coe’s dead body inside the mall. He is the latest Slow Horse eliminated by the assassins, even though he was not on their immediate list of targets.

River arrives too late, finding Coe dead and Sid gone. The loss traces back to Sid’s insistence on calling Diana, a move that River and Coe both distrusted.

Jackson Lamb, Damien Cantor and Frank Harkness

Lamb’s investigation moves on a separate track and finally puts a name above Frank. Reece uses his father Andrew Nesmith’s burner phone to threaten the person who hired Andrew to steal the Slough House file, and that man is media mogul Damien Cantor. Cantor sends Frank to handle the problem, but Lamb arrives at the meeting instead.

Lamb creates a public disturbance that distracts Frank and his men, buying time to escape with Reece in Flyte’s car. Reece also makes a bold accusation against Frank to help himself get away.

Because Frank does not recognize Emma Flyte, Lamb sends her to tail him, and she confirms that he is working for Cantor. That makes Taverner’s earlier appearance on Cantor’s network look even more suspicious.

Elsewhere, Catherine, Louisa, Moira and Shirley have all been directed to a summer home being used as a Slough House safehouse, and it belongs to Diana. One critic called the series a peerless exercise in genre television that raises the stakes with every installment. Readers who believe Diana Taverner is only buying time before a double cross of Vassily, rather than truly sacrificing Sid, are welcome to lay out that theory in the comments.