Entering its sixth season, Slow Horses has started to feel like comfort television as we are now so familiar with the characters and the set up but it is still a show firing on all cylinders. Season 6 continues with the same unhurried confidence the series has cultivated across five prior outings, even as there has been a major shake up with the creative team. With Gaby Chiappe stepping in as head writer after the departure of series creator Will Smith, the premiere still sounds and feels unmistakably like the show we have come to rely on: sarcastic, messy, and quietly lethal.
The episode wastes little time establishing its central unease. Former residents of Slough House are being targeted in ways that cannot be dismissed as coincidence, while the current roster discovers that their institutional footprint has been scrubbed from MI5’s systems with bureaucratic efficiency. Paychecks have stopped. Digital records have vanished. The Park appears content to treat the entire dumping-ground department as a clerical error that has finally been corrected. Jackson Lamb (Gary Oldman), never one to accept erasure quietly, responds in characteristic fashion by drinking, investigating, and refusing to pretend the situation is anything other than deliberate. This season the threat is personal. This is not a national security crisis; someone is methodically working through a list of people who once passed through the same dingy offices.
At the same time, River Cartwright is navigating a more intimate form of loss. The death of his grandfather David is the event that bring all the characters together. The funeral scene is played straight and with genuine feeling, allowing Jack Lowden the space to register grief without grandstanding. River’s relationship with David has always been the closest thing the series has to a moral compass, complicated and imperfect as it was. Watching him attempt to eulogise the man while maintaining the illusion that he wasn’t the former head of the secret service is one of the episode’s more affecting moments. The appearance of his terrorist father (Hugo Weaving) outside the church adds a mystery to the event and hints at the dangers to come.
Gary Oldman remains the series’ major draw. Lamb is still the same flatulent, day-drinking, contemptuous presence, yet Oldman continues to find new shades in the character’s weariness. There is a particular satisfaction in watching him piece together the pattern of the killings while the rest of the Service looks the other way. The performance never softens into sentimentality, but it does allow brief flashes of something like professional pride or at least the refusal to let his collection of misfits be quietly disappeared. The whole cast settles back into their roles with similar ease. Christopher Chung’s Roddy Ho is as insufferable and useful as ever. Saskia Reeves’ Catherine Standish carries the quiet competence that has always made her the team’s least flashy asset. Kristin Scott Thomas’s Diana Taverner, now installed as First Desk, projects the kind of polished ruthlessness that suggests the Park’s new management will prove no more benevolent than the old.
The changing of the guard behind the camera has not impacted proceedings. Lamb still delivers withering assessments of everyone in his orbit. The assassins themselves operate with a chilling casualness that undercuts any attempt at glamour. Their methods are efficient and ugly, and the episode refuses to linger on the spectacle. The result is a sense of genuine threat that feels more intimate than the larger conspiracies of earlier seasons. Someone knows who the Slow Horses are, who they used to be, and where to find them once the Service has written them out of existence.
There is real satisfaction in watching Lamb refuse to accept the official line that two deaths are unrelated accidents. There is quiet power in River’s attempts to honour a complicated legacy while the ground shifts beneath him. And there is the simple, reliable joy of the ensemble settling back into their dysfunctional family dynamic under pressure. The humour remains dry enough to cut through the gloom without undercutting the stakes. A funeral eulogy that doubles as tradecraft cover, a strike that consists primarily of day-drinking in the restaurant downstairs, the casual brutality of professionals who treat murder as another client meeting, these are the moments that have always defined the series.
This openers ends with the Slow Horses are more isolated than they have been in some time, their existence treated as an inconvenience by the very organisation that created them. The hunters are already moving down their list with River next on the chopping block. Personal history and institutional malice are beginning to converge in ways that promise genuine danger. Circle Of Life hits all the show’s particular strengths: effective character work, a willingness to let consequences land, and the understanding that the most interesting spies are often the ones the Service has already written off.
We are now set up for a season that will be darker and more personal than some of its predecessors, yet still recognisably the same world of compromised ideals and reluctant loyalty. For a series that has already delivered five strong seasons, that consistency is no small achievement. The horses are gelded, and the fix is in but watching them refuse to stay in the stalls is always rewarding.
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Where to watch Slow Horses – Season 6, Episode 1: Circle Of Life: