Slough House Is on Lockdown in Slow Horse’s Season Five Trailer

After four seasons, Slow Horses has become one of Apple TV+’s biggest hits. Based on Mick Herron’s novels, the series follows a group of MI5 rejects who nevertheless find themselves called into action when England is threatened. It’s smart, fun, thrilling, and features an excellent cast led by Gary Oldman as Jackson Lamb, the Slow Horses’ slovenly, misanthropic leader whose unkempt appearance masks his tactical genius.

The series’ fifth season finds Lamb and the rest of the Horses held by MI5 when the intelligence agency suffers a breach that could endanger thousands. And naturally, it’s up to the failed spies to save the day, no matter the cost to their dignity or reputations. Here’s the official synopsis:

In season five of Slow Horses, everyone is suspicious when resident tech nerd Roddy Ho has a glamorous new girlfriend, but when a series of increasingly bizarre events occur across the city, it falls to the Slow Horses to work out how everything is connected. After all, Lamb knows that in the world of espionage, the London Rules — cover your back — always apply.

Slow Horse’s fifth season begins streaming on Apple TV+ on September 24, 2025.