Understanding the Ending of Slow Horses Season 4 Explained

Essential Insights

The finale of Slow Horses Season 4 was memorable, highlighting River’s fraught meeting with his father.
Hugo Weaving’s role as Frank Harkness introduces significant intrigue and sets the tone for upcoming seasons.
Anticipate Season 5’s release in Spring 2025, bringing thrilling narratives and heightened tension.

Slow Horses has recently wrapped up its fourth season on Apple TV+, sparking discussions among fans about the season finale’s events and its implications for the show’s trajectory. With the fifth season on the horizon, it’s timely to analyze the pivotal moments from this season’s conclusion, which many agree will be remembered as a hallmark in television storytelling.

This series has climbed to the top of Apple TV+’s most beloved and widely viewed programs. Its third season racked up an impressive nine Emmy nominations, featuring categories such as Lead Actor for Gary Oldman and Supporting Actor for Jack Lowden, along with a nomination for Best Drama Series. The momentum continued as Season 4 achieved a rare perfect rating of 100% on Rotten Tomatoes.

What transpired in the finale of Slow Horses Season 4?

Based on the literary works of Mick Herron, Slow Horses was brought to life on screen by Will Smith (not the actor you’re thinking of). As for the conclusion of Season 4, viewers and critics have hailed it as the standout episode of the series, delivering a satisfying climax.

In the concluding episode titled ‘Hello Goodbye,’ tension escalates as River Cartwright (played by Jack Lowden) confronts the enigmatic antagonist, Frank Harkness (portrayed by the legendary Hugo Weaving). Harkness reveals that he is River’s biological father, a truth River had uncovered during his journey to France.

What follows is unexpected; Harkness extends an offer to train River as part of his mercenary group, comprised of individuals groomed from an early age to be lethal operatives. River, demonstrating his resolve, declines the proposition. Moments later, MI5 agents close in on their location, armed with a ‘shoot-to-kill’ directive targeting both Harkness and River.

Harkness makes a narrow escape, prompting River to chase him to St Pancras International Station in London. Utilizing his espionage skills, River tracks down Harkness, who voluntarily submits to arrest. However, Harkness’s cunning nature is revealed when he indicates he has a plan for an early release during his interrogation by MI5’s Deputy Director General, Diana Taverner (played by Kristin Scott Thomas).

Taverner is then called to a meeting at Slough House alongside Jackson Lamb (Gary Oldman) and other high-ranking MI5 officials. This unexpected turn was part of Harkness’s scheme, resulting in his release. The season culminates with River and Lamb sharing a drink at a local pub, leaving audiences eager to see what unfolds in Season 5 of Slow Horses.

Who is Frank Harkness?

Frank Harkness in Slow Horses Season 4 Finale

Frank Harkness, as portrayed by Hugo Weaving, serves as a pivotal character throughout Slow Horses Season 4 and is undoubtedly one of the most intriguing figures. His sinister nature and the shocking revelation of his relationship with River add a potent mix of excitement and uncertainty regarding the show’s future. Will audiences see Harkness again in forthcoming seasons? The answer is likely yes, as those versed in the source material can anticipate Harkness’s reappearance in subsequent stories.

While the timing of his return remains uncertain, snippets from the Season 5 trailer suggest that Harkness may not feature prominently. If he is to return, the creators might well prefer to keep it under wraps until the last possible moment.

River Cartwright’s response to the Season 4 conclusion

River Cartwright in Slow Horses Season 4 Finale

Following the finale of Slow Horses Season 4, many viewers are left pondering River Cartwright’s future. River, portrayed as enthusiastic, compassionate, and driven, has become a fan favorite, reminiscent of Tom Cruise with his constant on-screen action.

Harkness’s invitation for River to join his ranks injects new complexity into River’s emotional landscape as the show heads into Season 5. River’s rejection of his father’s offer—emphasizing his preference for seeing Harkness incarcerated—signifies a crucial turning point in his character’s journey.

The finale’s scene of River and Lamb sharing a drink also underscores River’s allegiance. Despite Lamb’s often abrasive demeanor, River recognizes Lamb’s loyalty to MI5 agents, accentuating his respect for a flawed mentor. This dynamic is intriguing given Lamb’s sarcastic attitude and counterproductive behavior towards River and their team at Slough House. River understands that Lamb’s steadfast support is a valuable aspect of their partnership.

You can stream all four seasons of Slow Horses now on Apple TV+.

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