Evidently, the bombing was Frank’s bright idea.

Unfortunately for Frank, the discovery of the Robert Winters cold body soured that idea.

With her life on the line, Molly acquiesces to Frank’s demands.

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Clearly, she feels guilty about the whole ordeal.

Although River manages to outsmart the Dogs, Flyte catches and cuffs him.

The finale ofSlow Horsesseason 4 airs on October 9, 2024.

Collage of Frank Harkness (Hugo Weaving) and David Cartwright (Jonathan Pryce) in Slow Horses season 4, ep 5

Custom Image by Kate Bove

Flyte recognizes two of the men in the photo, connecting Winters to the WestAcres bombing.

Slow Horses season 3 was the most action-packed installment of the show yet.

Here’s what happened in the ending and how it impacts season 4.

A composite image of River Cartwright walking dramatically in a train station in front of a promo image for Slow Horses featuring the cast in front of a blue backdrop

Slow Horses is an adaptation of CWA Gold Dagger Award-winning Mick Herron’s first novel in the “Slow Horses” series, which follows a team of British intelligence agents who serve in a dumping ground department of MI5 – Slough House. Gary Oldman stars as Jackson Lamb, the brilliant but irascible leader of the spies who end up in Slough House due to their career-ending mistakes.

River calls Flyte out for her distrust, though he agrees that Taverner operates on her own whims.

When Louisa answers, River’s mother is on the line.

Evidently, Louisa had called River’s mother when she thought River had died in David’s bathroom.

Jackson Lamb looking bedraggled in Slow Horses

When Louisa starts to mention David, River’s mother dismisses her.

David has not spoken to his daughter in years;Louisa is shocked by the Cartwrights' estrangement.

If word of this massive misstep leaked to the public, MI5 would be in hot water.

Jack Lowden as River Cartwright looking serious in Slow Horses season 4

At first, Whelan is adamantly opposed to Taverner’s tactics.

The new First Desk assigns Giti, a determined young agent, to collate the cold bodies.

Although Standish is opposed to Lamb’s methods, the head of Slough House forges on.

Gary Oldman as Jackson Lamb eating an ice cream and looking confused in Slow Horses season 3 with question marks in the background

Lamb confuses David into admitting the truth.

Throughout all ofSlow Horsesseason 4, David has grappled with his worsening dementia.

…this “deniable assassination squad” would be raised by Frank from birth as child soldiers.

Paul Hobden and Jackson Lamb Slow Horses

According to David, Frank is an ex-special forces agent and ex-CIA operative.

In building the Les Arbres compound,Frank hoped to create a squad of untraceable assassins for hire.

so you can get his daughter back, David traded Frank the cold body passports.

Slow Horses

David also furnished Les Arbres with weaponry and money.

To make matters more disturbing,David insinuates that his daughter actually wanted to be with Frank.

Before Frank departs, Patrice, the only remaining Les Arbres soldier, shows up.

Patrice confirms that he tortured and killed Chapman for information.

Frank informs Patrice that he was outsmarted by MI5’s rejects Jackson Lamb and other Slough House operatives.

Ashamed, Patrice says he should be punished.

It seems Frank wants Molly alive so that she can deliver the messages.

However, Frank has just a few hours left to complete the kill list for his boss.

Empowered by his father’s words, Patrice leaves to apprehend River.

Afterward, Frank threatens Molly but doesn’t shoot her.

In Frank’s wake, Molly discovers a series of letters left on her desk.

Each of the letters is addressed to someone at MI5, including Claude Whelan.

It seems Frank wants Molly alive so that she can deliver the messages.

Using Moira’s advanced access to MI5’s databases, Slough House is able to find footage of Patrice.

At the beginning of the episode, Flyte sends the photograph to Giti and Whelan, completely avoiding Taverner.

When Giti bursts into the office and mentions the photo, Taverner is taken off guard.

Ultimately, Patrice is able to knock Flyte unconscious.

“Hold still,” Patrice mutters and thenPatrice shoots River free of his handcuffs.

It’s a somewhat surprising development given the fact that Patrice was willing to kill just about anyone.

Needless to say,Slow Horsesseason 4’s penultimate episode sets up a thrilling finale.