'Slow Horses' Will Return for a Fifth Season. Here's What We Know So Far.
Slow Horses will be back for a fifth season. Months before season four premiered, Apple TV+ renewed the spy drama starring Gary Oldman. Season five, like previous seasons, will draw from Mark Herron's Slough House series. Specifically, season 5 of Slow Horses will be based on the fifth book in the series, London Rules.