Slow Horses Season 4 Release Date, Cast, Plot and More

Apple TV+’s hit spy drama Slow Horses is set to return for a highly anticipated fourth season. Based on Mick Herron’s Slough House book series, the show follows a team of British intelligence agents who have been relegated to the MI5’s Slough House division due to their career-ending mistakes. Led by their irascible boss Jackson Lamb (Gary Oldman), the dysfunctional spies find themselves navigating complex espionage missions as they attempt to redeem themselves.

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Season 4 will continue the thrilling adventures of the Slough House team. Here is everything we know so far about Slow Horses Season 4, including the potential release date, cast members, plot details, and more.

Release Date

Slow Horses has already been renewed for Season 4, though an exact release date has not yet been announced.

According to showrunner Will Smith, Season 4 will premiere no later than a year from now. This means fans can likely expect new episodes to drop in Fall 2024.

The previous three seasons all launched in Spring – Season 1 in April 2022, Season 2 in December 2022, and Season 3 set for March 2023. However, it appears Apple TV+ may push back Season 4 to Fall 2024 to allow more time between seasons.

Filming for Season 4 began in January 2023 in London, so a Fall 2024 release window seems reasonable once post-production is complete.

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Key Release Date Details

– Showrunner estimates Season 4 will launch no later than Fall 2024

– Previous seasons aired Spring 2022, Winter 2022, and Spring 2023

– Filming began January 2023

– Fall 2024 release targeted to allow more time between seasons


Most of the core cast members are set to return for Season 4:

  • Gary Oldman as Jackson Lamb
  • Jack Lowden as River Cartwright
  • Kristin Scott Thomas as Diana Taverner
  • Saskia Reeves as Catherine Standish
  • Rosalind Eleazar as Louisa Guy

In addition, several high-profile actors have joined the cast:

  • Hugo Weaving: Plays a potential villain with connections to the Cartwright family
  • Joanna Scanlan: In an undisclosed role
  • Tom Brooke: Playing one of Taverner’s associates at MI5
  • James Callis: Portraying an MI5 colleague of Taverner’s
  • Ruth Bradley: Starring as a new character being introduced to Slough House

More cast members may be announced as production continues.

Plot Details

Specific plot details are being kept under wraps. However, we do know that Season 4 will be based Mick Herron’s novel Spook Street.

The season is expected to open with a bomb exploding inside Slough House, detonating dangerous personal secrets and rocking the already unstable foundations of Jackson Lamb’s department.

One of the biggest mysteries will be the identity of the Slough House member who died in this attack. Showrunner Will Smith teased there will be “an empty chair” on the team in Season 4.

The season will also likely explore the lingering thread surrounding the top-secret file stolen back in Season 1. The file poses a potential existential threat to MI5’s reputation, and Taverner especially wants it recovered.

Beyond that, fans can expect to see the dysfunctional Slough House crew continue taking on complex espionage cases as Lamb utilizes their unique skills. Though often at odds, the team will have to cooperate to navigate the hazardous world of spies.


Apple TV+ has not yet released a trailer for Slow Horses Season 4. Production is still in the early stages, so it may be several more months before preview footage is launched.

Check back for updates on an official Slow Horses Season 4 trailer!

Slow Horses Season 4: Release date, Trailer & Plot | Is It Renewed? | Apple tv+ | Netflix World


With its stellar cast and gripping espionage plots, Slow Horses is poised to continue its twisty spy games in Season 4. Though an exact premiere date is still unconfirmed, fans should get new episodes featuring Jackson Lamb’s motley crew within approximately a year.

Stay tuned to the Apple TV+ platform in Fall 2024 for what is shaping up to be another intense and dramatic season of Slow Horses!

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