Slow Horses is a British spy thriller television series based on the Slough House series of novels by Mick Herron. The first series, Slow Horses, premiered on Apple TV+ on 1 April 2022. The second series, based on the novel Dead Lions, premiered on 2 December 2022. In June 2022, the programme was renewed for a third and fourth series. The third series, based on the novel Real Tigers, premiered on 29 November 2023. The fourth series, based on the novel Spook Street, premiered on 4 September 2024. In January 2024, it was renewed for a fifth series, which will be based on the fifth book in the series, London Rules. In October 2024, ahead of the fourth series premiere, it was renewed for a sixth series, which will be based on the sixth and seventh books in the series Joe Country and Slough House.