Slow Horses Season 6 Episode 3, “Resurrection,” brings Olivia Cooke’s Sid Baker back into River Cartwright’s life at the worst possible moment. The assassins hunting former members of Slough House are closing in, Jackson Lamb is gathering survivors, and Diana Taverner’s disastrous television interview has left her unusually vulnerable.
Gary Oldman’s Lamb and Jack Lowden’s River remain at the center of the story, but the episode makes room for welcome returns by Cooke’s Sid and Rosalind Eleazar’s Louisa Guy. It also answers an immediate question from “Daddy Issues”: Joanna Scanlan’s Moira Tregorian survived the attempt on her life.
Catch up on Sid’s reappearance and the stolen Slough House files in our Season 6 Episode 2 recap and review.
River and Sid Barely Have Time for a Reunion
River found Sid at David Cartwright’s house at the end of the previous episode. “Resurrection” gives them the conversation that discovery demands, though neither gets the luxury of a complete explanation. River believed Sid had died after she was shot in Season 1. Sid, meanwhile, does not initially grasp how thoroughly her survival was concealed from the people who knew her.
Cooke and Lowden fall back into the pair’s prickly rhythm immediately. Their exchanges are funny because the shock beneath them is real: River is trying to reconcile the colleague standing beside him with years spent believing she was gone. Sid has her own reasons to question what River knew and why he never found her.
Then Jim and Jane arrive. Their pursuit forces River and Sid out of David’s house and into a flight that repeatedly cuts their conversation short. The killers appear to know where to find them, making Sid’s return more than an emotional revelation. She may be another target, a link to the operation or both.
The two take refuge with an older woman named Anne, giving the episode one of its characteristically absurd pauses in the middle of mortal danger. The comedy does not make the assassins less frightening. It shows how River and Sid cope while trying to work out what has followed them there.
A Clue in Kazan Complicates Sid’s Return
Sid tells River about a strange travel request connected to Kazan, Russia. An apparent system error became considerably harder to dismiss once the killers appeared. Digging further, she finds a report of a woman murdered in Kazan and begins to suspect that somebody may have used her identity in connection with the killing.
Jim and Jane’s Russian-language exchange strengthens the possibility that the attack has a Russian connection. It does not settle who employs them, why all the former Slow Horses are being targeted or whether Sid’s identity is the starting point of the campaign. Those are still separate questions.
Sid wants to report what she has found to Taverner. River is understandably wary of trusting anyone at the Park while the Slough House records have been compromised and his colleagues are being hunted. Their disagreement gives the reunion some needed friction: their old rapport returns faster than their trust can.
By the end of the episode, J.K. Coe has collected them, but Sid’s insistence on making a call interrupts the attempt to stay hidden. Jim and Jane remain close. “Resurrection” offers clues about the hunt, then leaves River and Sid exposed before they can turn those clues into a safe plan.
Louisa Returns to Save Moira
Elsewhere, Catherine Standish and Shirley Dander pull Louisa away from the comfortable professional life she has built outside Slough House. Louisa has little reason to welcome another Lamb emergency, but the danger to former members of the team makes staying away increasingly difficult.
Their urgent stop is Moira’s home. Jim and Jane left the former Slough House administrator in a house filled with gas, arranging the scene to look like an accident. Catherine, Shirley and Louisa reach her in time. Moira is alive, although in no condition to pretend the attack was harmless.
The rescue is the episode’s second meaning of “Resurrection.” Sid has returned after years of being presumed dead; Moira survives an attempt that seemed to have succeeded only one episode earlier. Both reversals underline the danger of accepting the version of events somebody else has arranged for MI5 to see.
Louisa and Shirley subsequently seek out a black-market gun dealer known to the old team. It is an uneasy return to familiar habits. Louisa has escaped the daily chaos of Slough House, but she cannot ignore that people from that part of her life are being selected for murder.
Lamb Finds Reece Nesmith
Lamb and Roddy Ho track down Reece Nesmith, whose father Andrew was killed after becoming entangled with Frank Harkness and the stolen MI5 files. Reece witnessed enough to matter, and his father’s phone may offer Lamb another route into the larger operation.
Reece’s exchanges with Lamb and Roddy provide much of the episode’s comic energy. Lamb has never been particularly gentle with adults; meeting a younger person who can answer his insults without flinching gives Oldman a lively new scene partner.
There is a harder purpose beneath the banter. Andrew’s death connected the file theft to Frank, while Reece may know something about the encounter that ended it. Lamb takes the phone and pursues the lead himself, leaving Roddy with a responsibility he is hardly equipped to make look reassuring.
Taverner Loses Control at the Park
Diana Taverner’s television interview continues to damage her standing as First Desk. Her choice of words has created a public and political problem, and the pressure makes her dealings with Emma Flyte especially revealing. Rather than calmly managing the fallout, Taverner reassigns Flyte to Slough House after Flyte challenges her.
It is a punishment that also deprives Taverner of a capable officer while an attack on former MI5 personnel is underway. Kristin Scott Thomas makes the decision feel less like a clever maneuver than an angry attempt to recover authority she can feel slipping.
Lamb visits Taverner with a theory: the campaign against his people could be retaliation for something connected to her. He has reasons to suspect a wider intelligence operation, but the episode does not confirm the person who ordered the killings. Frank’s involvement with Andrew and the stolen records remains important without making him the proven architect of every attack.
That uncertainty is the season’s strongest engine so far. Lamb can identify the shape of a threat before he knows its source, while Taverner has information and problems of her own that she has little appetite to share.
Final Verdict
“Resurrection” is remarkably entertaining for an episode built around scattering people into hiding. Cooke and Lowden make Sid and River’s reunion sharp and unsettled, Eleazar slips easily back into Louisa’s wary loyalty, and Oldman finds fresh comic friction with Lenny Rush’s Reece.
The hour also trusts its mystery. Kazan, Sid’s identity, Frank’s role and Taverner’s political trouble are suggestive pieces, yet the script resists claiming they form one solved picture. The middle chapter occasionally has the feel of moving players into position, but the pairings make that movement a pleasure to watch—and the danger around River and Sid keeps it urgent.
Sid and Louisa’s returns give the hunt for former Slow Horses fresh energy, while River and Sid’s reunion keeps a tense episode unexpectedly funny.
Slow Horses Season 6 Episode 3 Ending Explained
Why Are River and Sid Still in Danger?
Sid finds evidence suggesting her identity may have been used in connection with a murder in Kazan. The assassins’ apparent Russian connection makes that discovery urgent, but “Resurrection” does not confirm whether the killing explains the entire campaign against Slough House. River and Sid are collected by Coe, then risk exposing their location when Sid stops to make a call. Jim and Jane remain close as the episode ends.
Is Moira Tregorian Alive?
Yes. Catherine, Shirley and Louisa rescue Moira from her gas-filled home. Jim and Jane had staged the attack to look accidental, and the previous episode left her survival uncertain. She is shaken and ill, but she is alive.
Is Frank Harkness Behind the Attacks?
The episode does not prove that Frank ordered Jim and Jane to kill former Slow Horses. He is linked to Andrew Nesmith and the stolen information, making him a serious part of Lamb’s investigation. Lamb also suspects the attacks may be retaliation connected to Taverner. The relationship between those leads remains unresolved.
Where to Watch and What’s Next
“Resurrection” is streaming on Apple TV. Slow Horses Season 6 Episode 4 is scheduled for Wednesday, October 7. You can also browse Seat42F’s “Resurrection” episode photos.
Thomas Miller is the founder and Editor-in-Chief of Seat42F, covering television, movies and streaming entertainment. He launched Seat42F in 2007 and has spent nearly two decades covering the entertainment industry.
