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| Slow Horses Season 6 Episode 3 Recap. |
Frank Harkness wastes no time in Slow Horses season 6 episode 3, murdering Andrew Nesmith and leaving the Slough House team scrambling to understand why their colleagues are being targeted. What starts as an investigation into a string of suspicious deaths quickly expands into something far more dangerous, with a stolen file, a political media ambush and a child who witnessed a killing all pulling the story in different directions.
The episode opens with Harkness arriving at Andrew’s flat after Andrew has been escorted out of the Park following his dismissal. Andrew has managed to take a valuable file with him, which immediately makes his final moments rather less straightforward than they first appear. Harkness waits until the right moment, then kills him from behind by choking him.
Unfortunately for Harkness, Andrew has an unexpected witness. His son sees what happens and bolts from the flat, leaving Harkness with a new problem that could prove considerably more troublesome than the original job.
Back at Slough House, Jackson Lamb and the remaining Horses begin piecing together what connects the dead agents. Kay White’s history becomes a priority, with Lamb sending Coe and Shirley to investigate her background. River and Roddy, meanwhile, are given the considerably less glamorous task of tracking down Harkness’ car and working out where the assassin has been operating.
Roddy, naturally, makes even a simple piece of surveillance unnecessarily entertaining. He finds the location of Harkness’ car almost straight away but decides not to tell River immediately. Instead, he tries to use the opportunity to bond with him, apparently believing that annoying River is a form of emotional support. River is understandably not convinced.
Once they have the location, River and Lamb head to Andrew’s flat. The place is stripped of anything useful, including phones and other electronics, while Andrew’s body has replaced the punching bag that presumably had a considerably better day.
River spots a CCTV camera across the road and follows that lead. The footage reveals a child on a scooter, eventually identified as Reece Nesmith, Andrew’s son. His difficult childhood and time spent moving between homes make him harder to locate, but his knowledge of what happened inside his father’s flat could be crucial.
Coe and Shirley have their own breakthrough while investigating Kay. They head to her boat and begin searching for anything that might explain her movements. Shirley also helps herself to cash from Kay’s purse and uses it to buy food, because apparently even an increasingly dangerous investigation cannot stop the Horses from finding inventive ways to cover lunch.
The food stop produces something more useful than expected. The vendor remembers seeing a man and woman around the canal on the night in question. He never contacted the police because his visa had expired, but his account gives the team another potential clue about what happened to Kay.
Meanwhile, Catherine is struggling with the truth about Charles Partner. She turns up at a wine shop and buys alcohol, making it fairly clear that she is not processing the revelation particularly calmly. It is one of the quieter moments of the episode, but it gives Catherine's storyline a welcome sense of weight after so much operational chaos.
Diana’s problems are becoming considerably more public. She meets Peter Judd at a restaurant, where he introduces her to Damien, a popular political podcaster with a sizeable audience and a distinctly conservative streak. Damien reveals that he was the person Peter borrowed money from, meaning Diana now owes him.
His demand is simple enough: one television interview. If she refuses, Damien threatens to use his platform to expose the situation to a much larger audience. Diana has little room to manoeuvre and reluctantly agrees.
That decision does not go down well with Emma Flyte. Diana is already under pressure before the cameras start rolling, and the interview only makes matters worse. Damien pushes her on previous controversies, including attacks on British soil and claims surrounding foreign influence at the highest levels of MI5.
Diana manages to get through the interview, but the aftermath is brutal. Messages begin arriving from people with plenty to say about her performance, adding another layer of pressure to an already chaotic situation. It is less a media appearance than a public stress test, and Diana does not exactly get the luxury of a comfortable chair.
Elsewhere, the two assassins make their move against Moira Tregorian. After stopping at a hardware shop, they arrive at her home disguised as gas engineers. They get inside, knock her unconscious and carefully arrange the scene to make her death appear to be a suicide.
The episode then connects several of its apparently separate threads. Harkness meets Damien and confirms that Andrew has been dealt with. The implication becomes clear: Damien hired Harkness to kill Andrew. But there is still one major complication. Andrew’s son witnessed the murder.
The stolen file remains important, but Damien now leaves the decision over Reece’s fate to Harkness. That puts the child directly in the path of one of the most dangerous people in the story.
Things become even more uncomfortable at the Park. Jackson visits Molly and starts asking questions about the situation surrounding the Horses. With the supposed system glitch wiping Slough House’s digital records and the paper files also disappearing, Lamb realises that whatever is happening is much bigger than a routine security problem.
He gives the team the order “Blake’s grave”, effectively sending them underground. The Horses have to disappear before whoever is targeting them gets another chance.
Lamb also catches Catherine while she is on the road and tells her to get into the car. Catherine initially resists, but the circumstances leave little room for debate. Eventually, she gets in.
Then River discovers something that changes the direction of the episode again. He asks Roddy to trace calls connected to Harkness, only to discover that they were made from inside David’s house.
River is furious. He throws Roddy out of the car and heads straight back to David’s place, leaving Roddy stranded by the roadside. It is exactly the sort of argument that would be funny under normal circumstances. Given that assassins are currently hunting them, it is slightly less ideal.
River quickly realises the team needs to move. He starts organising traffic and splitting everyone up so they can reach the safe house without travelling together in one obvious target. The Horses are scattered across different routes, trying to stay ahead of the people closing in on them.
Then comes the episode’s final surprise.
River reaches David’s house expecting answers and instead finds Isobel Cartwright waiting for him.
That final reveal gives the episode a sharp cliffhanger because River has spent most of the hour trying to work out who can still be trusted. Just as he reaches what should be another piece of the puzzle, the person waiting for him raises an entirely new set of questions.
The episode is particularly effective because it keeps several storylines moving without making them feel completely disconnected. Frank’s assassination work, Damien’s media pressure, Diana’s increasingly uncomfortable public position and the Horses’ sudden disappearance from the system gradually start forming one larger picture.
Episode 3 is where the season really starts tightening the screws. The best part is how the tension comes from several different directions rather than relying solely on gunfights or chase sequences. Frank remains frighteningly efficient, while Damien is arguably more unsettling because he can create damage simply by talking into a microphone. River and Roddy provide some much-needed dry humour, especially with River’s spectacularly short patience, but the jokes never completely deflate the danger around them.
Catherine’s quieter reaction to Charles Partner’s truth also works well, giving the episode some emotional breathing room. The biggest strength, though, is the way the story keeps changing the team’s understanding of what is happening. Every answer creates another problem, and by the time River reaches David’s house, the audience is left with exactly the same question he has: what is Isobel Cartwright doing there? It is a strong ending and a good reason to keep watching.
With Slough House effectively forced underground, Andrew’s son still exposed, Harkness waiting for his next instruction and Isobel suddenly back in River’s path, Slow Horses season 6 episode 3 leaves plenty to unpack. What did you make of that final reveal, and do you think Isobel has answers for River or another complication waiting for him?