Slow Horses has always thrived on its particular brand of grimy, cynical excellence, the kind that makes bureaucratic failure and personal dysfunction feel like the only honest response to the intelligence world. Daddy Issues continues that tradition with a steady, escalating sense of dread laced with the series’ trademark dry wit. It builds directly on the premiere’s funeral atmosphere and scattered killings, tightening the noose around anyone who has worked at Slough House.
The episode opens with a cold, efficient scene that establishes the deadly stakes without unnecessary stylised flourishes. Frank Harkness moves through London with the calm purpose of a man who has done this sort of work for decades, closing one loop while inadvertently leaving another open. The scene is brutal in its simplicity, one man garrotting another in a drab council flat. From there the episode cuts between the Horses’ increasingly compromised position and the methodical work of a pair of professional killers hunting them who treat murder like an everyday occurrence. Their trip to a hardware store, complete with casual examination of tools, lands with a particular chill precisely because it is so mundane.
River Cartwright remains the emotional centre, still reeling from his grandfather’s death and the sudden reappearance of the father he has every reason to distrust. Jack Lowden plays the mix of grief, suspicion, and stubborn determination with the same controlled intensity that has defined the character across previous seasons. River’s decision to chase leads despite clear instructions not to feels consistent with everything we know about him: competent enough to be dangerous to himself and others, loyal enough to ignore self-preservation when family or unfinished business is involved. The mysterious phone calls he receives up psychological pressure on him that the episode milks effectively without overplaying.
Jackson Lamb, as always, anchors the chaos. Gary Oldman’s performance continues to be heavy on contempt for everyone and competence disguised as aloofness. Lamb’s investigation into the erased records and missing physical files reveals the scale of the problem with the kind of weary clarity only he can deliver. His decision to order the team dark are delivered with the dry, world-weary authority. There is a particular satisfaction in watching Lamb treat the situation as both an existential threat and just another Tuesday at Slough House. The humour remains black as can be with the absolute refusal to romanticise any of it.
Shirley and Coe’s investigation into one of the earlier deaths yields useful information through the kind of low-level street work that the series does better than almost anyone. Roddy Ho’s technical contributions get River the information he is after. Catherine Standish is on the brink drowning her sorrows after finding about a truth about Lamb. The all, except Roddy, register the rising danger with the appropriate mix of resignation and quiet competence.
Kristin Scott Thomas continues to play First Desk Diana Taverner with the icy precision of someone who has long treated vulnerability as a professional liability. In this episode she finds herself unexpectedly cornered by the shady media mogul Damien Cantor, introduced through the ever-opportunistic Peter Judd. What begins as a tense lunch meeting quickly reveals that the large sum of money Diana previously confiscated was originally Cantor’s, giving the polished young owner of a right-leaning news channel immediate leverage. He wants a televised interview, an appearance First Desk almost never grants. Diana agrees under duress, arriving at the studio with clear boundaries about operational details and personal matters. The conversation starts with the expected fluff before pivoting without warning into aggressive territory: pointed questions about British responses to nerve-agent attacks on home soil, and far more dangerous “whispers” that a previous First Desk had been in the pay of a foreign power. The latter lands like a calculated blow. Diana is visibly caught off guard, forced into careful non-answers that only make her look evasive under the studio lights. The entire scene is a masterfully staged ambush that you can see coming a mile off, exposing how even someone as controlled and politically adept as Taverner can be blindsided when institutional secrets meet media power and blackmail. Her barely contained fury afterward, and the mocking text that follows, underline just how precarious her position has become. It is one of the episode’s strongest character beats, showing that the threat is no longer confined to the margins of Slough House but reaches into the very heart of the Park.
This is still an early episode in a six-part season that, for the first time, is adapting material from two novels, so much of the runtime is spent connecting threads rather than racing toward climactic set pieces. That choice has both strengths and mild drawbacks. The deliberate tempo allows character reactions and institutional paranoia to breathe, and the uncovering of details about the stolen files and the professional killers create genuine unease. Frank’s scenes with his employer clarify motivations just enough while leaving larger questions open. The killers’ methodical progress through the list of targets underscores that this is not random violence; it is a systematic cleanup operation.
Daddy Issues leans into questions of legacy, erasure, and the ways institutions protect themselves by making people disappear, sometimes literally, sometimes through paperwork. The deletion of digital records and the theft of physical files turn identity itself into something fragile. Characters who were already consigned to the margins of MI5 find that even their marginal existence can be edited out. River’s complicated relationships with both his biological father and the grandfather whose shadow still looms provide the emotional depth. The title is not subtle, but the execution is spot on.
River’s decision to ignore the order to go dark and pursue one more lead feels true to character even as it raises the stakes. What he finds at the end of that pursuit is a genuine surprise for anyone who has followed the series from the beginning. The cliffhanger takes us right back to the first ever episode while simultaneously complicating the immediate danger surrounding the remaining Slow Horses.
Daddy Issues succeeds in expanding the conspiracy without revealing its hand, deepens existing character dynamics, and ends by leaving you wondering where this is all going. The blend of black comedy, spy craft, and genuine menace remains intact. The world of Slough House still feels like a place where competence is accidental, loyalty is complicated, and survival often depends on being just stubborn enough to ignore better advice. This episode captures that spirit cleanly while maintaining momentum.
There is a particular satisfaction of watching Lamb navigate a threat that is both personal and professional and a refusal to pretend that the intelligence services are anything other than deeply imperfect human institutions.
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Where to watch Slow Horses – Season 6, Episode 2: Daddy Issues: