Apple TV has confirmed that the popular spy series Slow Horses will move forward with an eighth season, even though seasons six and seven have not yet been released. The new season will be based on the ninth book in Mick Herron’s Slough House series, titled Clown Town. This decision highlights the show’s ongoing success and the strong audience interest in the series, which follows the misadventures of MI5’s least competent agents. In the upcoming eighth season, Jackson Lamb, played by Gary Oldman, and River Cartwright, portrayed by Jack Lowden, will face new challenges as they deal with a failed attempt to blackmail the Park—a term used to refer to the British government’s top intelligence officials. This situation will lead to tension between Lamb and MI5’s head, Diana Taverner, played by Kristin Scott Thomas. Lamb will also be forced to uncover one of the agency’s most troubling secrets, adding depth to the already complex narrative. The eighth season is scheduled for release in 2028, following the planned release of season six in 2026 and season seven in 2027. At the time of the announcement, season six had already received critical acclaim, earning a 100% rating on Rotten Tomatoes. Critics have praised the season, with Giovanni Lago from Next Best Picture giving it an 8 out of 10 and calling it “one of the year’s essential watches.” Similarly, The Telegraph’s Ed Power praised Gary Oldman’s performance, calling him “reliably excellent.” However, not all reviews were uniformly positive; Metro’s Rebecca Cook gave the season four stars, noting that while it was well-made, it felt weaker and more repetitive than earlier seasons. Currently, the first five seasons of Slow Horses are available to stream on Apple TV. Season six is set to premiere on September 16, 2026, marking the next chapter in the ongoing story of Slough House and its unconventional agents. With each new season, the series continues to build on its reputation as a sharp, darkly humorous take on the world of espionage.