Slow Horses, series four: 'swaggering' spy thriller returns
Gary Oldman is 'impeccable' in one of the 'most consistent' shows on TV

Based on a series of spy thriller novels by Mick Herron, "Slow Horses", which has returned to Apple TV+ for its fourth series, is a "jewel in the streaming service's crown", said Neil Armstrong on BBC Culture. The show about a rag-tag group of MI5 rejects has "lots to say about the UK", with its "London of grotty takeaways, depressing pubs and bin bags full of rubbish all over the streets".
The intelligence agents have each mucked up a mission in their own way or are just deemed no longer suitable to work at the Park, MI5's fictional HQ in London's Regent's Park. It's up to Jackson Lamb (Gary Oldman), who is in charge of misfit-central Slough House, to get the MI5 rejects to quit.
The action is exciting; the opening episode features a terrorist attack, a jaw-dropping killing and some "brilliant Jackson Lamb zingers".
Subscribe to The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.

Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
The so-called "slow horses" who have been put out to pasture have hitherto behaved as if they don’t give two hoots about each other, said Fran Hoepfner in Slate. But here, their admiration of each other comes through, though efforts toward developing relationships between some of the more minor characters "ring hollow" and the "pivot to personal" is a bit of a "shaky turn" for a show that excels at both action and comedy.
But Lamb's band of second-rate spies finally show what they are capable of when they "stop bickering for all of five seconds", revealing a group that is "stronger, sharper, and more capable than ever".
Good job then, as the new villain of the piece, Frank Harkness, played by Hugo Weaving gives them a run for their money. Weaving runs a mercenary home for boys, one of whom could be responsible for the bombing that kicks off the series' proceedings.
Alongside this new threat, agent River Cartwright (Jack Lowden) and his grandfather David (Jonathan Pryce), a former MI5 grandee, both find themselves on the run from The Park and the group of mercenaries operating out of France.
A free daily email with the biggest news stories of the day – and the best features from TheWeek.com
Notable new faces this season are the super keen Moira (Joanna Scanlan, known for her roles in Armando Iannucci’s "The Thick of It" and "In the Loop") and the slick Claude Whelan (James Callis), who comes up against the brilliant Diana Taverner (Kristin Scott Thomas). Callis's depiction of "slippery, half-confident upper management" is as good an example as you'll see, said Nick Hilton in The Independent.
If the fourth season of the show proves anything, it’s that these two characters – River and Lamb have given "Slow Horses" a "beating heart". Oldman as Lamb, who is "as corpulent and corrupt as ever" is "impeccable".
Despite its sometimes muddled plotlines and "repetitive bickering", "Slow Horses" establishes itself as "innovative time and time again", said Hoepfner in Slate. For all the chances they have to escape Slough House, "there’s a reason why they" – i.e. the slow horses – "(and we) keep coming back".
"Slow Horses" is both "swaggering and well-defined" and has emerged as one of the "most consistent, and consistently enjoyable, shows on TV", said Hilton in The Independent.
-
Cloudbursts: what are the 'rain bombs' hitting India and Pakistan?
The Explainer The sudden and intense weather event is almost impossible to forecast and often leads to deadly flash-flooding and landslides
-
Atoms into gold: alchemy's modern resurgence
Under the radar The practice of alchemy has been attempted for thousands of years
-
Crossword: August 19, 2025
The Week's daily crossword
-
The 5 best singers turned actors of all time
the week recommends It's not often that someone is born with both of these rare skill sets
-
A descent into academic Hell, a ferocious feminist fable and the adult debut of a beloved children's author
The Week Recommends August books include R.F. Kuang's 'Katabasis,' Xenobe Purvis' 'The Hounding' and Louis Sachar's 'The Magician of Tiger Castle'
-
The best limited series of all time
the week recommends Trading cliffhangers and endless renewals for narrative closure
-
Experience the cool of these 11 stunning pools and lazy rivers this summer
The Week Recommends You'll want to dive right in
-
The latest entry in Ethan Coen's queer trilogy, a Jeff Buckley documentary and the rare children's horror flick in August movies
the week recommends The month's film releases include 'Honey Don't!,' 'It's Never Over, Jeff Buckley' and 'Sketch'
-
One great cookbook: 'Salt to Taste'
The Week Recommends Your roadmap to satisfying Italian home cooking
-
The return of 'Wednesday,' an 'Alien' prequel and a dramatic retelling of the Amanda Knox trial all happening in August TV
the week recommends This month's new television releases include 'Alien: Earth,' 'The Twisted Tale of Amanda Knox' and a new season of 'Wednesday'
-
Go beyond the islands you already know in these 8 countries. Surprises await.
The Week Recommends These destinations fly under the radar