It hasn’t even been a year since Apple TV‘s superb espionage drama, Slow Horses, aired its eventful Season 5 finale. But Slough House’s finest misfit MI5 agents are already returning with thrilling new episodes.

For those who need a refresher, Slow Horses Season 5 shined a spotlight on tech master Roddy Ho (Christopher Chung) and his suspiciously gorgeous girlfriend, who used him to infiltrate The Park so her team could carry out terror attacks across London. Many felt that the fifth season was Slow Horses‘ funniest yet, so consider yourself warned that Season 6 marks a major tonal shift. Why? Slow Horses past and present all have hits out on them and are fighting for their lives!

Slow Horses Season 6 trailers have teased guns, fights, car chases, explosions, compelling chaos, and sky-high stakes. They’ve also given glimpses of new characters played by Lenny Rush, Harry Lloyd, and Kyle Soller. And we’ve even seen the return of familiar faces like Hugo Weaving as Frank Harkness and Olivia Cooke as Sidonie “Sid” Baker.

So when does Slow Horses Season 6 come out? Which Mick Herron novels are being adapted this time around? And who’s in the Slow Horses Season 6 cast? Here’s everything to know about Season 6 of Slow Horses, including Season 6 premiere date info, book summaries, and beyond.

Will There Be A Season 6 Of Slow Horses On Apple TV? Slow Horses Season 6 Renewal Status:

You bet! Less than a week after its Season 4 finale, Apple TV renewed Slow Horses for Season 6.

When Does Slow Horses Return On Apple TV? Slow Horses Season 6 Release Date:

Slow Horses Season 6 premieres Wednesday, September 16 on Apple TV. But locked-in Apple TV fans know that episodes start streaming sooner. Here’s what we mean by that…

What Time Does Slow Horses Come Out On Apple TV?

Apple TV regularly releases new episodes at 9:00 p.m. ET the night before designated premiere dates, so if you’re extra eager to watch, keep your eyes peeled for new Slow Horses episodes at 9:00 p.m. ET on Tuesdays. That means the Season 6 premiere will start streaming Tuesday, September 15 at 9:00 p.m. ET.

Slow Horses Season 6 Release Schedule: How Many Episodes Are In Slow Horses Season 6?

Like Slow Horses seasons past, Season 6 will consist of six episodes. After its September 16 premiere, new episodes of Slow Horses will be released on Wednesdays until the Season 6 finale airs on October 21. Read on for a Slow Horses Season 6 release schedule, and don’t forget those early Tuesday release times:

• Season 6, Episode 1, “Circle of Life”: Wednesday, September 16
• Season 6, Episode 2, “Daddy Issues”: Wednesday, September 23
• Season 6, Episode 3, “Resurrection”: Wednesday, September 30
• Season 6, Episode 4, “Lost and Found”: Wednesday, October 7
• Season 6, Episode 5, “Sayonara”: Wednesday, October 14
• Season 6, Episode 6, “Judgement Day”: Wednesday, October 21

What Will Slow Horses Season 6 Be About? And Which Mick Herron Book Does Slow Horses Season 6 Adapt?

Per Apple TV’s official synopsis, “Season 6 sees the Slow Horses on the run as Diana Taverner embroils them all in a fatally high-stakes game of retaliation and revenge.” Slow Horses Season 6 will be based on Joe Country and Slough House, the sixth and seventh books in Mick Herron’s series. If you’re interested in learning more, we’ve got book summaries below.

Joe Country Plot: What Is Book 6 In Mick Herron’s Slough House Series About?

Want more info on Slow Horses Season 6? Here’s the synopsis of Joe Country, straight from Herron’s website:

In Slough House, the London outpost for disgraced MI5 spies, memories are stirring, all of them bad. Catherine Standish is buying booze again, Louisa Guy is raking over the ashes of lost love, and new recruit Lech Wicinski, whose sins make him an outcast even among the slow horses, is determined to discover who destroyed his career, even if he tears his life apart in the process.

Meanwhile, in Regent’s Park, Diana Taverner’s tenure as First Desk is running into difficulties. If she’s going to make the Service fit for purpose, she might have to make deals with a familiar old devil.

Slough House Plot: What Is Book 7 In Mick Herron’s Slough House Series About?

Here’s the synopsis of Slough House, straight from Herron’s website:

At Slough House, Brexit has taken a toll. The slow horses have been pushed further into the cold, Slough House has been erased from official records, and its members are dying in unusual circumstances, at an unusual clip. No wonder Jackson Lamb’s crew is feeling paranoid. But are they actually targets?  

With a new populist movement taking hold of London’s streets and the old order ensuring that everything’s for sale to the highest bidder, the world’s a dangerous place for those deemed surplus. Jackson Lamb and the slow horses are in a fight for their lives as they navigate dizzying layers of lies, power, and death.

Slow Horses Season 6 Cast: Olivia Cooke Returns!

In addition to many returning fan favorites, Slow Horses Season 6 welcomes a number of new characters and cast members who’ve starred in popular TV series and films like Andor, The Witcher, The Theory of Everything, Am I Being Unreasonable?, and more. But the biggest cast reveal is undoubtedly that Season 1 star Olivia Cooke is reprising her role as Sid Baker! Here are some key players you’ll spend time watching over the next six episodes:

• Sir Gary Oldman as Jackson Lamb
• Kristin Scott Thomas as Diana Taverner
• Jack Lowden as River Cartwright
• Saskia Reeves as Catherine Standish
• Rosalind Eleazar as Louisa Guy
• Christopher Chung as Roddy Ho
• Aimee-Ffion Edwards as Shirley Dander
• Tom Brooke as J.K. Coe
• Olivia Cooke as Sidonie “Sid” Baker
• Jonathan Pryce as David Cartwright
• Hugo Weaving as Frank Harkness
• Lenny Rush as Reece Nesmith
• Harry Lloyd as Damien Cantor
• Kyle Soller as Jim
• MyAnna Buring as Jane
• Ruth Bradley as Emma Flyte
• Samuel West as Peter Judd
• Joanna Scanlan as Moira Tregorian

Is There A Slow Horses Season 6 Trailer?

You bet! Get a first look at the high-stakes chaos that awaits the Slow Horses in Season 6 here:

How Many Books Are in Mick Herron’s Slow Horses Book Series?

Herron has written standalone novels, short story collections, and several novellas throughout his career, but there are currently nine full novels in his “Slough House” series, listed in order of publication here:

• Book 1: Slow Horses (2010)
• Book 2: Dead Lions (2013)
• Book 3: Real Tigers (2016)
• Book 4: Spook Street (2017)
• Book 5: London Rules (2018)
• Book 6: Joe Country (2019)
• Book 7: Slough House (2021)
• Book 8: Bad Actors (2022)
• Book 9: Clown Town (2025)

Will There Be A Slow Horses Season 7?

Although Season 6 has yet to premiere, we already know there will be a Slow Horses Season 7 On July 8, 2025, months ahead of its Season 5 premiere, Apple TV also renewed Slow Horses for Season 7, revealing in a press release, “In Season 7, Lamb and his Slow Horses are on the hunt to find and neutralize a mole at the heart of British Government before they can bring down the state.”

Where Can I Watch Slow Horses? Apple TV Streaming Info:

Want to catch up on Slow Horses or rewatch ahead of Season 6’s premiere? Head to Apple TV to stream.

Apple TV comes with a seven-day free trial for new subscribers and has just one ad-free streaming plan available for $14.99/month.

A bundle with Apple TV and Peacock is also available starting at $14.99/month.

Stay tuned for more Slow Horses Season 6 coverage from Decider.