Slow Horses Season 4 Preview: Potential Release Date, Cast List, Plot

Yes, there is Slow Horses season 4! In June 2022, Apple TV Plus announced the renewal of the series for both a third and fourth season. In a recent interview, showrunner Will Smith said:

"So you won’t have to wait longer than a year.”

• Jack Lowden as River Cartwright
• Kristin Scott Thomas as Diana Taverner
• Saskia Reeves as Catherine Standish
• Aimee-Ffion Edwards as Shirley Dander
• Kadiff Kirwan as Marcus Longridge
• Christopher Chung as Roddy Ho
• Rosalind Eleazar as Louisa Guy
• Jonathan Pryce as David Cartwright

The fourth season, inspired by Mick Herron's "Spook Street," is set to explore new depths of espionage and personal conflicts. The storyline focuses on River Cartwright and his grandfather David, a former intelligence officer whose fading memory poses a threat of exposing dangerous secrets.

This season will also address the aftermath of Season 3's climax, where MI5's questionable operations were brought to light. With Taverner's ascent to First Desk and Catherine Standish's uncertain future, the narrative is full of suspense and mystery. A bomb explosion in London propels the Slow Horses into a difficult investigation, hinting at potential casualties and escalating the suspense.

A trailer for Slow Horses season 4 aired at Slow Horses season 3 final episode, but so far it hasn't been released online.

In the thrilling finale of "Slow Horses" Season 3, the stakes are higher than ever. The episode opens with River Cartwright, narrowly surviving an explosion. He, along with Louisa Guy and Sean Donovan, are trapped in a deadly game of cat and mouse within a records facility. As they attempt to escape with a crucial file named “Footprints,” containing damning evidence of MI5's corruption, Sean is tragically shot.

Meanwhile, Jackson Lamb, sets up elaborate traps in a house to protect Catherine Standish, echoing a "Home Alone" style of defense. The episode masterfully intercuts between this scene and the intense shootout at the facility, where Shirley Dander and Marcus Longridge face off against Duffy's agents. In a dramatic turn, River's grandfather, David Cartwright, burns the "Footprints" file, believing it's for the best.

However, River reveals he has a copy, ensuring the file's secrets remain alive. The episode concludes with significant changes at MI5, setting up intriguing possibilities for the next season. The finale balances action, suspense, and character development, leaving viewers can't wait for what's next for the Slow Horses team.