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Slow Horses Season 5: Everything We Know About The Premiere Date, Plot, And The Darker Turn Of 'London Rules'

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The wait is finally over for fans of the schlubby spies at Slough House. As of today, December 21, 2025, the official premiere date for Slow Horses Season 5 has been confirmed, promising a return to the gritty, cynical, and darkly comedic world of MI5's rejects. Apple TV+ has given the green light for the new season, with production already wrapped, ensuring a swift return for Jackson Lamb and his team.

This upcoming season, based on Mick Herron’s fifth Slough House novel, *London Rules*, is set to take a much darker and more explosive turn, plunging the Slow Horses into a major terrorist plot that hits too close to home. The confirmed release date is now public, alongside exciting cast additions and the surprising news that the show’s future is secure for at least two more seasons after this one.

The Official Slow Horses Season 5 Release Date and Production Status

The highly anticipated fifth season of Slow Horses is officially set to premiere on Wednesday, September 24, 2025, exclusively on Apple TV+.

The series, known for its rapid production schedule, has once again delivered an impressive turnaround. In fact, the production has been so efficient that filming for Season 5 has already wrapped, and, in a massive win for fans, Season 6 has also completed filming, with a seventh season already announced.

  • Premiere Date: Wednesday, September 24, 2025
  • Streaming Platform: Apple TV+
  • Source Novel: *London Rules* (Slough House Book 5)
  • Episode Count: Expected to be six episodes, consistent with previous seasons.

This rapid-fire production cycle, which sees a new season released almost every year, is a testament to the show's success and the commitment of Apple TV+ to adapting Mick Herron’s acclaimed spy novels. The consistency ensures that the narrative flow of the Slough House series remains intact, moving quickly through the source material.

The Returning Cast and New Faces for 'London Rules'

The heart of Slow Horses lies in its phenomenal ensemble cast, led by the Oscar-winning Gary Oldman. Fans will be relieved to know that the core group of "slow horses" and their MI5 superiors are all set to return, bringing their dysfunctional brilliance back to the screen.

The confirmed main cast includes:

  • Gary Oldman as Jackson Lamb, the slovenly and brilliant head of Slough House.
  • Jack Lowden as River Cartwright, the ambitious but exiled grandson of a former MI5 legend.
  • Kristin Scott Thomas as Diana Taverner, the formidable "Second Desk" (and eventual "First Desk") at Regents Park.
  • Saskia Reeves as Catherine Standish, Lamb’s long-suffering and deeply loyal first officer.
  • Rosalind Eleazar as Louisa Guy, the pragmatic and capable agent.
  • Aimee-Ffion Edwards as Shirley Dander, the newest Slow Horse with a troubled past.
  • Christopher Chung as Roddy Ho, the obnoxious but indispensable IT whiz.
  • Ruth Bradley as Emma Flyte, the intelligence officer who often crosses paths with the team.

A major new addition to the Season 5 cast is actor Nick Mohammed, known for his Emmy-nominated role in *Ted Lasso*. While details about his character are under wraps, he is confirmed for a guest role, which is expected to be a significant part of the new season's plot.

Plot Details: A Darker, More Explosive Threat

Season 5 is based on *London Rules*, a novel that marks a significant shift in tone for the Slough House series, moving toward a more immediate and terrifying threat. The core conflict revolves around a wave of coordinated terrorist attacks that rock the heart of London, creating chaos and fear across the capital.

The novel begins with an unnerving mass shooting in a quiet English village, quickly followed by other seemingly random acts of violence, including the bombing of a zoo enclosure.

The Terrorist Threat and the Slough House Connection

The underlying plot reveals a scheme to destabilize London by assassinating key figures, including mayoral candidates. This is a plot so sensitive and politically charged that the "Dogs" at Regents Park, led by Diana Taverner, are desperate to contain it, even if it means resorting to the kind of covert, morally grey operations that the phrase "London Rules" implies: cover-ups and self-preservation above all else.

The Slow Horses, perpetually on the outside, find themselves drawn into the crisis when one of their own is targeted. Early reports suggest the plot will focus heavily on Roddy Ho, the team's socially awkward but technically brilliant hacker. His personal life, specifically his relationship with his girlfriend, Kim, becomes unexpectedly entangled with the central terror plot.

This season is said to take a "much darker turn," forcing the Slow Horses to tackle a threat that is not just a high-level MI5 conspiracy, but a palpable danger to the city they operate in.

The Future of the Slough House Series: Season 6 and Beyond

The confirmation of Season 5's release and the astonishing news about Seasons 6 and 7 provides a clear roadmap for the future of the Apple TV+ spy drama. The show is committed to adapting the next books in Mick Herron's espionage series, ensuring the continued journey of Jackson Lamb and River Cartwright.

What Books Will Follow?

The Slough House novels are being adapted sequentially, meaning the confirmed future seasons will likely cover:

  • Season 6: Expected to be based on the sixth novel, *Joe Country*.
  • Season 7: Expected to be based on the seventh novel, *Bad Actors*.

This commitment means fans can look forward to seeing the Slow Horses tackle the fallout from *London Rules* and continue to be the thorn in MI5's side for years to come. The continued focus on the complex relationship between the outcasts at Slough House and the high-flying agents at Regents Park will remain a central theme.

The return of the core ensemble, the introduction of compelling new characters like Nick Mohammed’s guest role, and the promise of a darker, more action-packed plot based on *London Rules* are setting the stage for what could be the most intense season of Slow Horses yet. Mark your calendars for September 24, 2025, to see Jackson Lamb's misfit spies save the day—or at least, try not to burn down London in the process.

Slow Horses Season 5: Everything We Know About the Premiere Date, Plot, and the Darker Turn of 'London Rules'
slow horses season 5 release date
slow horses season 5 release date

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