The 'Slow Horses' Season 4 Trailer Takes Us Down to 'Spook Street'

It's no secret in the industry that Apple TV+ is the most lavish spender of the technology companies who jumped into the streaming service game, even more than Amazon. After an unfortunate launch in 2019, where the service only offered a paltry four series, all of which felt like what someone assumed "prestige TV" looked like instead of looking at the individual shows themselves, Apple went on a hiring spree where they boarded multiple former HBO producers and talent (all of whom were escaping the coming AT&T-Warner Bros. Discovery debacle). Since then, the service has launched some of the highest-end shows imaginable, with spectacular casts, only to see its viewership surpassed by everyone, including Tubi. Eventually, this commitment to art over money will come to an end. However, until then, we will still have a few more months of spectacular viewing, including two more seasons of Slow Horses, one of Apple TV+'s only mainstream hits.

Based on Mick Herron's novel series, Slow Horses has spent the last three seasons tracing the antics of the residents of Slough House, the place MI-5 puts their incompetent spies, whom they can't fire for various reasons. Herron has 13 novels and short stories, and the series covers one novel per season; Season 4 adapts book four, Spook Street. Season 3, which covered Real Tigers, revealed a major in-house betrayal and ended with massive explosions and a firefight. Season 4 will return to the aftermath of the choices made by the two men who run Slough House, Jackson Lamb (Gary Oldman) and River Cartwright (Jack Lowden).

With the show moving from the December berth occupied by Seasons 2 and 3 to a September debut for Season 4, the trailer is out, and Lamb has found himself back to relying on his old tricks once more to navigate the rapidly shifting landscape.

Here's the synopsis for Season 4:

Adapted from Spook Street, the fourth novel in the Mick Herron spy series, the darkly humorous drama follows a dysfunctional team of British intelligence agents who serve in a dumping ground department of MI5 known un-affectionately as Slough House. Jackson Lamb is the brilliant but irascible leader of the spies, who end up in Slough House due to their career-ending mistakes as they frequently find themselves blundering around the smoke and mirrors of the espionage world. Season 4 opens with a bombing that detonates personal secrets, rocking the already unstable foundations of Slough House.

Oldman (Oppenheimer) and Lowden (The Gold) will again be joined by the returning ensemble of Kristin Scott Thomas (Gosford Park), Saskia Reeves (Roadkill), Rosalind Eleazar (The Personal History of David Copperfield), Christopher Chung (Waterloo Road), Aimee-Ffion Edwards (Wolf Hall), Kadiff Kirwan (My Policeman), and Jonathan Pryce (The Crown). Season 4's main guest stars include Hugo Weaving (Patrick Melrose), Joanna Scanlan (The Larkins), Ruth Bradley (Guilt), Tom Brooke (Bodyguard), Leroy Kincaide (Gangs of London), and James Callis (Star Trek: Picard).

Showrunner Will Smith (Veep) is once again the lead writer for Season 4, with Morwenna Banks (Funny Woman), Mark Denton (Medici), and Jonny Stockwood (iBoy). Director Adam Randall (I See You) helmed all of Season 4. Smith also serves as executive producer alongside Jamie Laurenson, Hakan Kousetta, Iain Canning, Emile Sherman, Jane Robertson, Julian Stevens, Douglas Urbanski, Gail Mutrux, and Graham Yost. 

Slow Horses Season 4 will debut with two episodes on Wednesday, September 4, 2024, on Apple TV+ with two episodes, and then continue with new episodes streaming weekly on Wednesdays into October. Season 5 is already greenlit.