When Does Slow Horses Season 6 Episode 4 Come Out?

Apple’s official description for “Lost and Found” reads:

“Lamb tries figuring out who Frank is working for. Sid, River, and Coe do everything to evade the hit squad.”

That puts Frank Harkness even closer to the center of this season’s sprawling conspiracy. River’s psychopathic father has been lurking around the edges of the story since David Cartwright’s funeral, but it’s increasingly clear that he isn’t acting alone. The big question now is who hired him and how all of this connects back to Slough House, Diana Taverner and the Russians.

Meanwhile, River and Sid are still trying to stay one step ahead of Jim and Jane—the two assassins who spent much of last week hunting them through the countryside. This time J.K. Coe is along for the ride, which should make for an entertaining trio given his particular brand of cheerful sociopathy. Then again, this promotional image of Coe has me a wee bit concerned:

The conspiracy expands in Episode 2 as Jim and Jane continue hunting people connected to Slough House, including an attempt to kill Moira Tregorian and make her death look accidental. Lamb realizes that the murders aren’t random and that somebody appears to be systematically working through current and former Slow Horses.

Meanwhile, Diana Taverner walks into a disastrous television interview engineered by Peter Judd and media personality Damien Cantor, leaving the new First Desk politically exposed just as the crisis inside MI5 is getting worse. Lamb also discovers that sensitive Slough House material has gone missing, suggesting the people targeting his agents may have access to information they should never have been able to obtain.

Frank Harkness remains deeply entangled in the mystery, while River tries to trace mysterious calls he believes are connected to his father. That investigation takes him back to David Cartwright’s house, where the episode delivers its biggest surprise yet: Sid Baker is alive.

Olivia Cooke’s character was shot in the head way back in Season 1 and subsequently disappeared, with River eventually being told she had died. Instead, River walks into his grandfather’s house and finds Sid waiting for him.

Episode 3 – “Resurrection” (Read my full recap and review here).

River barely has time to process Sid’s resurrection before Jim and Jane show up at David Cartwright’s house. Sid recognizes the assassins and she and River make a run for it, leading to an extended chase through the countryside as the killers close in, prompting me to write this post about my concerns over characters suddenly acting stupid in order to further the plot – not something this show is known for.

During their escape, River finally gets some answers about where Sid has been for the past three years. More importantly, Sid reveals that somebody apparently used her identity for a movement request connecting her to Kazan, Russia. Jim and Jane also let their own secret slip when Jane speaks Russian, making the Russian connection to the conspiracy a lot less theoretical.

Elsewhere, Catherine and Shirley track down former Slow Horses Louisa Guy and Moira Tregorian, pulling more members of the old gang back into Lamb’s orbit. Moira survived Jim and Jane’s attempt to kill her, while Louisa has apparently traded the chaos of Slough House for cozy corporate life.

Lamb and Roddy Ho, meanwhile, track down Reece Nesmith, the teenage son of murdered former MI5 agent Andy Nesmith. Reece witnessed Frank Harkness killing his father, making him both a valuable witness and another obvious target.

Diana Taverner continues to unravel following her disastrous television interview and sends Emma Flyte to Slough House after the two clash. By the end of the episode, the pieces are starting to come together, but the biggest questions remain unanswered: Who is Frank working for? Why are Russians targeting Slow Horses? And what exactly happened to Sid during the years everyone believed she was dead?

Season 6 Is The First Two-Book Adaptation

• Lenny Rush — Reece Nesmith. We met this new addition in Episode 3. Reece is the young son of murdered former MI5 agent Andy Nesmith and a witness to Frank Harkness’s latest bit of unpleasantness. Rush won a BAFTA TV Award for Am I Being Unreasonable? and has also appeared in Doctor Who.
• Kyle Soller — Jim. Soller, best known to many viewers as Syril Karn in Andor, plays one half of the lethal pair targeting people associated with Slough House. It’s going to be hard for me to not see him as Syril, if I’m being totally honest.
• MyAnna Buring — Jane. Buring, who played Tissaia de Vries in Netflix’s The Witcher, stars opposite Soller as Jane. We now know that Jim and Jane’s very English names are almost certainly aliases, with Episode 3 revealing their Russian connection.
• Harry Lloyd — Damien Cantor. Lloyd, known as the obnoxious Prince Viserys in Game of Thrones and for Counterpart, joins the season as Damien Cantor, a media personality involved in the larger plot.
• Lucian Msamati also joins the Season 6 cast. Promotional footage shows his character putting pressure on Taverner, though Apple has not prominently detailed his role in its official cast announcement.