TV Review: ‘Slow Horses’ Season 4

The series, which adapts Mick Herron’s bestselling novels about a group of intelligence agents exiled to a low-rent office, is full of typically spiky dialogue.

Gary Oldman in 'Slow Horses' season 4 now streaming on Apple TV+.

Returning for its fourth season with one episode on September 4th, ‘Slow Horses’ continues to prove itself as one of the best series on offer via the Apple TV+ service.

In fact, Apple has clearly been so happy with the viewership of the show, and so willing to future-proof the availability of its cast, that it has been shooting two seasons at once. A fifth is already in the works, and the start of the fourth indicates that it has lost none of the unpredictable, grungy and satisfyingly British style that fans have come to enjoy.

Does ‘Slow Horses’ Season 4 succeed in its mission?

Jack Lowden in 'Slow Horses' season 4 now streaming on Apple TV+.

While there’s little doubt that the key to ‘Slow Horses’ appeal is Gary Oldman having the time of his life as the grubby, greasy, but incredibly sharp agent Jackson Lamb (the actor has scored a welcome first Emmy nomination for the role following Season 3), the show still doesn’t lazily rely on the performance and the character, evolving each season to embrace new personalities and expanded storylines, while maintaining what works.

For Season 4, that more-of-the-same-with-a-twist approach shows no sign of faltering, and indeed, the initial episodes –– we’ll only really discuss the first here as that’s the one landing on premiere day –– are suitably excellent.

‘Slow Horses’ Season 4: Script and Direction

(L to R) Ruth Bradley and Gary Oldman in 'Slow Horses' season 4 now streaming on Apple TV+.

Led by Will Smith (a writer and former stand-up with experience on Armando Iannucci’s shows, not the movie star), the series’ writing team is always on point, using Mick Herron’s novels as a starting point for the basic structure of each season and then expanding from there, but always in organic fashion.

It may not always be as action-packed as other shows (though it certainly has its moments –– witness the traumatic bomb attack that opens this season), when you have dialogue that crackles like this, you don’t need every space to be filled with someone waving a gun. And in the mouths of Oldman and the rest of the game cast, it’s always guaranteed to make you laugh or gasp… sometimes at the same time.

On the visual side of things, the show benefits from having both a more limited number of episodes per season (usually six) and one director through the whole batch, meaning that the show –– also thanks to a hefty budget from Apple –– ends up looking like a movie cut into TV-sized chunks. The environs of Slough House, the low-rent office where Lamb and co. are based, are wonderfully scruffy and evocative, in stark contrast to the polished glass and cold concrete of MI5’s main Regent’s Park HQ.

And the show uses London’s variety of landscapes and neighborhoods, plus other areas in the UK, to great effect. In Season’s 4 case, the man in charge of the show’s look is Adam Randall, who fits in well with the overall style.

‘Slow Horses’ Season 4: Performances

Oldman might rightfully score the lion’s share of the plaudits, but there is a wider ensemble all putting in great performances.

Gary Oldman as Jackson Lamb

Gary Oldman in 'Slow Horses' season 4 now streaming on Apple TV+.

Oldman has repeatedly said that he’s having the time of his life playing the grumpy, cynical and endlessly mucky head of Slough House, and that energy seeps out of every pore. The vanity-free performance (Lamb is frequently seen with lanky hair, grease stains and mismatched clothing), is a truly memorable one, the slovenly appearance the perfect camouflage for a truly inspired spy mind.

Jack Lowden as River Cartwright

Jack Lowden in 'Slow Horses' season 4 now streaming on Apple TV+.

While he was the audience surrogate character at the start, the young agent banished to Slough House after a training mission goes wrong, River has grown into a great sidekick for Lamb, and an impressive character in his own right. And Lowden brings a superb blend of world-weariness and enthusiasm to the role.

Jonathan Pryce as David Cartwright

Jonathan Pryce in 'Slow Horses' season 4 now streaming on Apple TV+.

Though the elder Cartwright has mostly been a supporting character in earlier seasons, it’s easy to see why Smith chose an experienced thespian like Pryce to play him; because he knew that David would become much more important down the line. And Pryce brings a potent combo of wise elder former agent and humbled aging grandfather to the part, which expands here.

Kristin Scott Thomas as Diana Taverner

Kristin Scott Thomas in 'Slow Horses' season 4 now streaming on Apple TV+.

Few people can do withering putdowns like Thomas, and in Taverner, she’s found the ideal outlet. A canny, ice-cold professional, she’s forever frustrated by the hapless government types she’s forced to deal with. And her endlessly watchable interactions with Oldman are often a highlight of each season.

Other notable characters

(L to R) Aimee-Ffion Edwards, Christopher Chung, Tom Brooke, Kadiff Kirwan and Rosalind Eleazar in 'Slow Horses' season 4 now streaming on Apple TV+.

The rest of the Slough House ensemble all get their moments in the sun, and this fourth season includes a healthy influx of new characters (since in this show, a long life expectancy is never guaranteed). Highlights of the new episodes include Joanna Scanlan (like showrunner Smith, a veteran of Armando Iannucci’s shows) as the eager-to-please Moira and Tom Brooke as JK, a mysterious and honestly weird fresh addition to the office. And not forgetting James Callis as Claude Whelan, the nervous, officious new First Desk of MI5 and a great foil for Taverner.

‘Slow Horses’ Season 4: Final Thoughts

Gary Oldman in 'Slow Horses' season 4 now streaming on Apple TV+.

‘Slow Horses’ creative team have said they’ll happily keep making the show as long as Apple wants them to (and Mick Herron keeps writing books to adapt, with the author up to eight and counting), and that’s welcome news.

If only more series were as consistently entertaining, and this still full of steam when their fourth seasons rolled around, the TV landscape would be in much better shape.

‘Slow Horses’ Season 4 receives 8.5 out of 10 stars.

Slow Horses

"Old sins cast new shadows."

TV-MA4 SeasonsApril 1st, 2022

Watch Slow Horses Online

What’s the story of ‘Slow Horses’ Season 4?

Adapted from Mick Herron’s ‘Slow Horses’ novel ‘Spook Street’, Season 4 opens as a bomb has exploded in a shopping center in London and MI5 is racing to figure out who is responsible. Second Desk (the second-in-command of the intelligence service) Diana Taverner (Kristin Scott Thomas) must balance the demands of the investigation with effectively babysitting the nervy new First Desk (James Callis).

As for those at Slough House, River Cartwright (Jack Lowden) is faced with his grandfather David’s (Jonathan Pryce) increasingly fragile mental condition, compounded by a new mystery that could threaten both their lives. Jackson Lamb (Gary Oldman), meanwhile, is his same old, irascible self, happy to endlessly mock his team of exiled agents, but also fiercely loyal when it comes to protecting them.

And he’ll need to, as a face from the past has returned to cause trouble…