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Season guide

Slow Horses: Season 4

6 episodes Premiered Sep 4, 2024 Updated Oct 1, 2026

In season 4 of the British spy thriller television series Slow Horses, a bombing detonates personal secrets, rocking Slough House's already unstable foundations. Adapted for television by the English comedian and writer Will Smith from the novels by Mick Herron, the series follows MI5's most unruly spies, who are back and under attack. The dysfunctional team of MI5 agents and their obnoxious boss, the notorious Jacks

Previously on Slow Horses

Season 4 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ The series centers on a dysfunctional team of MI5 agents and their obnoxious boss, the notorious Jackson Lamb, known as MI5's most unruly spies.
  • ⚡ The agents navigate the espionage world's smoke and mirrors to defend England from sinister forces while working out of Slough House.
  • ⚡ The television series is a British spy thriller based on the Slough House novels by Mick Herron.
  • ⚡ The adaptation for television is written by the English comedian and writer Will Smith.
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Season overview

In season 4 of the British spy thriller television series Slow Horses, a bombing detonates personal secrets, rocking Slough House's already unstable foundations. Adapted for television by the English comedian and writer Will Smith from the novels by Mick Herron, the series follows MI5's most unruly spies, who are back and under attack. The dysfunctional team of MI5 agents and their obnoxious boss, the notorious Jackson Lamb, navigate the espionage world's smoke and mirrors to defend England from sinister forces.

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Season 4 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 4 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 4: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

50%
50%
Mytharc (3): Crucial lore & season climaxes
Core (3): Character development & subplots
Side Quest (0): Standalone / filler
S4·E1 Mytharc

Identity Theft

Sep 4, 2024 · 44 min

A London bombing puts Taverner under pressure. When River grows concerned for his grandfather, Louisa encourages him to go for a visit.

S4·E2 Core

A Stranger Comes to Town

Sep 11, 2024 · 47 min

A naive agent makes a discovery about the Westacres bomber. Lamb suspects that David knows more than he's letting on.

S4·E3 Core

Penny for Your Thoughts

Sep 18, 2024 · 47 min

River is trapped in France. Back at Slough House, the Dogs have come for Lamb.

S4·E4 Core

Returns

Sep 25, 2024 · 43 min

Taverner is desperate to hide dangerous secrets. River seeks answers at his grandfather's house.

S4·E5 Mytharc

Grave Danger

Oct 2, 2024 · 41 min

Lamb questions David about France as River comes face to face with the enemy.

S4·E6 Mytharc

Hello Goodbye

Oct 9, 2024 · 53 min

Impossible decisions are faced and sacrifices are made.

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