Slow Horses
Spoilers are forwards for dull Horses time of year 3 .
Summary
Based on theSlough Housenovels by Mick Herron , Apple TV+‘sSlow Horsesdeviates from its source material at time . However , one crucial alteration has become more manifest in the backwash ofSlow Horsesseason 3 , which adjust Herron’sReal Tigers . By and magnanimous , the spy thriller series has been faithful to its source stuff . As in the novel , the rude - yet - incisive veteran MI5 agentJackson Lamb ( Gary Oldman ) head up Slough House , a purgatory for MI5 agentswho’ve made calling - ending missteps . Although these " slow knight " are relegated to drudgery , they get involved in gamy - profile cases .
Aside from impertinent intelligence information officer Jackson Lamb , Slow Horses ' other primal charactersinclude River Cartwright ( Jack Lowden ) , a newly minted MI5 agent who lands in Slough House after make a very public fault , and Diana Taverner ( Kristin Scott Thomas ) , the Deputy Director General of MI5 and school principal of operation . Unsurprisingly , Lamb has a complicated relationship with Taverner , who ’s MI5 ’s denominate " Second Desk . “In Herron ’s novels , there are five desk place that manage various MI5 departments , though all of them describe to the coveted First Desk — a position Taverner has been eyeing , much to Slough House ’s dismay .
Ahead of season 4 ’s release , Slow Horseshas already been renew for a 5th outing .

Whelan Will Have A Huge Effect On Slow Horses Season 4
InSlow Horsesseasons 1 through 3 , Ingrid Tearney ( Sophie Okonedo ) serves as the Director General of MI5 — a.k.a . the " First Desk . " While Taverner learns to rely in Lamb ’s crowd , Tearney thinks very little of the dishonored slow buck . for test MI5 ’s security measures efforts , Tearney set up the kidnapping of an office decision maker , Catherine Standish ( Saskia Reeves ) . When the abduction spiral out of MI5 ’s restraint and becomes a existent scourge , Tearney is forced to turn to Slough House for help . Standish ’s capturer , Sean Donovan ( Sope Dirisu ) , reveals that he wants a secret file , " Footprints . "
The renewal of Slow Horses for Season 5 stand for the show will be around for at least two more season but it hurts the narration for time of year 4 in one way .
Donovan design to leak the subject of Project Footprints to expose MI5 corruption at the highest storey . At the end ofSlow Horsesseason 3 , it ’s incriminate that River leaks the file and ends Tearney ’s reign . " It ’s you in the hot derriere now , Diana , " Lamb tells Taverner , who ’s taking on First Desk duties . However , Taverner ’s promotion deviates from Herron ’s novels . InSlough House ’s 4th book , Spook Street , Claude Whelan replaces the discredited Ingrid Tearney as Director General of MI5 . Interestingly , Slow Horseshas redact James Callis as Whelan , which has massive implication for Taverner ’s time of year 4 story .

Custom Image by Kate Bove
What Happens To Whelan In The Books
Jackson Lamb ’s final conversation with Taverner inSlow Horsesseason 3 ’s finis takes blank space before Taverner head to a coming together . Given everything that ’s unfolded internally for MI5 , and gift that she ’s primed for the office , Taverner take on that she ’ll formally be made First Desk in her post - stroll - with - Lamb encounter . watcher do n’t get to see how that conversation pan off out , leaving the season - four bearer of the First Desk somewhat up in the air . Since Whelan was n’t boast ahead ofSlow Horsesseason 4,it ’s possible Whelan ’s institution in the quaternary outing will see him usurping Taverner ’s spot .
According to the series ' showrunners , Slow Horsesseason 4 should be released by the end of December 2024 .
In the book , River is n’t the one who leaked the Project Footprint file . Instead , the information lands in Jackson Lamb ’s hands . Unlike River , Lamb turn down to hand over the single file , which ends up impacting Taverner ’s campaign for First Desk . Spook Streetsees Taverner continuing her Second Desk role and heading up MI5 ’s Operations . By the end of the fifth Holy Writ in Herron ’s series , London Rules , the pressure of First Desk becharm up with Whelan . After Whelan is ousted from the situation , Taverner finally ascends to her long - desired character in the sixth full - lengthSlough Housenovel , Joe Country .

Based on a series of novel , sluggish Horses on Apple TV+ is a suspense - filled spy thriller — but this time of year 1 mystery remains suspiciously unrequited …
Slow Horses Season 4 Needs Whelan
Since Callis has been spue as Whelan , it seems likely thatSlow Horsesseason 4will use the character to thwart Diana Taverner ’s control to First Desk . Not only would Whelan ’s unexpected forwarding to First Desk in time of year 4 ’s chess opening keep the serial more in line with the Scripture , but it would provide Taverner with yet another obstruction to overcome . MI5 ’s Second Desk holder has already proven to be devious , especially when it make out to her personal ambitions . Plus , show more internal strife within MI5 restrain the stake high , especially when so much ofSlow Horsesboils down to trust .



