Slow Horses author speaks out on the potential for more books in the series after Clown Town
There have now been nine books in the series - and it seems more are on the way.
The first episode in the fifth season of Slow Horses is now available to stream on Apple TV+, adapting the fifth novel in Mick Herron's book series, London Rules.
Seasons 6 and 7 of the show have already been commissioned, and will also be based on Herron's work, specifically the sixth, seventh and eighth books in the series.
Beyond spin-off books with links to the central series, that will just leave one book left in the series to adapt – Clown Town, which was just released earlier this month.
Thankfully, fans don't need to worry about the story ending there, as Herron has teased there are more novels on the way, even if he's not sure quite how many.
Speaking exclusively with RadioTimes.com at a special An Evening with Radio Times screening of Slow Horses season 5 at the BFI, Herron was asked how long he could see the book series going on for beyond Clown Town.
"There will be more to come," he said. "I haven’t decided how many yet but I’m enjoying myself and don’t plan to stop just yet."
Earlier this year, Herron teased the plot of Clown Town ahead of its release, telling Radio Times: "It's to do with a very horrible, real-life operation that was carried out by the intelligence services during the height of the Troubles. It's set now, it's a Slough House novel, but it's dealing with multiple things that happened 40 years ago and the traumatic and ongoing effects that they have on the people involved.
"And what it must be like for an agent to do something which is nominally for the good in the country and to safeguard the Commonwealth, if you like, but, in fact, is morally dubious and personally traumatic."
At the screening, the author also revealed that season 5 of the show features "a lot of interesting departures from the book", all of which he found enjoyable and some of which he instigated himself.
Slow Horses season 5 releases on 24th September 2025 on Apple TV+ – sign up to Apple TV+ now.
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Authors
James Hibbs is a Drama Writer for Radio Times, covering programmes across both streaming platforms and linear channels. He previously worked in PR, first for a B2B agency and subsequently for international TV production company Fremantle. He possesses a BA in English and Theatre Studies and an NCTJ Level 5 Diploma in Journalism.
