InSlow Horsesseason 4, episode 1, two violent events unfold.

First, a man using the MI5 alias Robert Winters ignites a car bomb in the WestAcres shopping center.

By the end of the episode,Slow Horsesreveals what happened to River.

Article image

Still very much alive, he uses the dead look-alike to his advantage.

New episodes ofSlow Horsesseason 4 premiere on Wednesdays on Apple TV+ through October 9, 2024.

River assumes that Frank attacked him merely because he was in the wrong place at the wrong time.

Collage of Hugo Weaving as Frank Harkness looking serious and Jack Lowden as River Cartwright looking stressed in Slow Horses season 4

Custom Image by Kate Bove

Clearly, Frank was keen on destroying any evidence of his former activities in Les Arbres.

The Slough House agent explains thatBertrand broke into his grandfather’s house and intended to kill the older man.

As a result, Bertrand was on the receiving end of David’s shotgun.

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.

Frank intended to raise his sons as soldiers in a secluded, patriarchal environment.

Once the boys were old enough, Frank forced their mothers to leave the compound.

“That’s how he wanted it,” Bertrand’s mother tells River, looking pained.

Slow Horses

Clearly, Frank’s schemes were a long time in the making.

It appears Bertrand was working for his father when attempting to kill David Cartwright.

How Is River Cartwright Connected To Frank Harkness In Slow Horses?

As the former head of MI5, David made plenty of enemies.