Season 1 • Episode 1

River Cartwright is ousted from MI5 and finds himself in a place worse than purgatory: Slough House, dumping ground for failed spies.

Season 1 • Episode 2

River and Sid join forces. A misfired gun has dire consequences.

Season 1 • Episode 3

Slough House is the unlikely venue for a secret romance, but events take a dark turn when a dangerous encounter becomes deadly.

Season 1 • Episode 4

Taverner sends the Dogs to hunt down Lamb and the Slow Horses. River holds the secret to saving the gang.

Season 1 • Episode 5

The Slow Horses must disappear to avoid capture by MI5. Lamb and River head to The Park to outwit Taverner.

Season 1 • Episode 6

Taverner and the Slow Horses attempt different approaches to locate the kidnappers and Hassan. Ho makes a shocking discovery about Sid.

Season 2 • Episode 1

Jackson Lamb is on high alert after a former spy is found dead. Min and Louisa are tempted by an offer from outside Slough House.

Season 2 • Episode 2

Lamb liaises with a Russian defector who may hold a clue to sleeper agents. River is on the trail of a ruthless assassin.

Season 2 • Episode 3

River gets cozy in the Cotswolds while searching for a sleeper agent. Min discovers Russian drinking games are the most brutal of all.

Season 2 • Episode 4

Louisa makes her move on Pashkin. Catherine makes moves of a different kind when she plays high-stakes chess with a sinister stranger.

Season 2 • Episode 5

Lamb orders his Slow Horses to walk into traps. River believes something alarming is heading toward London.

Season 2 • Episode 6

Lamb and Katinsky go head-to-head. Ho finds himself trapped on a train with a Russian assassin.

Season 3 • Episode 1

A romantic relationship in Istanbul ends badly. Lamb hits the panic button when one of his Slow Horses fails to show up for work.

Season 3 • Episode 2

River has to steal something out of the Park to save a life. Lamb realizes a stranger game is afoot.

Season 3 • Episode 3

Marcus and Shirley face Lamb's wrath. River discovers revenge is a dish best served cold.

Season 3 • Episode 4

Tearney makes a bold move. The Slow Horses assist the Tiger Team, unaware of their hidden agenda. Lamb and Ho take a road trip.

Season 3 • Episode 5

Taverner and Tearney face off for control of MI5. River and Louisa find themselves caught in the crossfire.

Season 3 • Episode 6

The Slow Horses fight for their lives. Lamb shares some devastating truths with Catherine.

Season 4 • Episode 1

A London bombing puts Taverner under pressure. When River grows concerned for his grandfather, Louisa encourages him to go for a visit.

Season 4 • Episode 2

A naive agent makes a discovery about the Westacres bomber. Lamb suspects that David knows more than he's letting on.

Season 4 • Episode 3

River is trapped in France. Back at Slough House, the Dogs have come for Lamb.

Season 4 • Episode 4

Taverner is desperate to hide dangerous secrets. River seeks answers at his grandfather's house.

Season 4 • Episode 5

Lamb questions David about France as River comes face to face with the enemy.

Season 4 • Episode 6

Impossible decisions are faced and sacrifices are made.

Season 5 • Episode 1

A mass shooting rocks London, intensifying a testy mayoral race. Shirley believes one of the Slow Horses was the target of an attempted hit.

Season 5 • Episode 2

Lamb intercepts an assassin. Taverner receives a key piece of intel about the Abbotsfield shooting.

Season 5 • Episode 3

An act of sabotage grinds London to a halt. Taverner interrogates Roddy. Coe is convinced a destabilization strategy is at play.

Season 5 • Episode 4

Flyte sets out to find Roddy's girlfriend. The gang is dispatched to two different campaign events to prevent another attack.

Season 5 • Episode 5

Lamb debriefs River and Coe. Roddy is pulled in to help decipher a piece of code as the destabilization strategy nears its final stage.

Season 5 • Episode 6

It's up to the Slow Horses to stop Farouk's team from completing its mission in a final act of mass carnage.

Season 6 • Episode 1

Episode 1

Episode summary unavailable.

Season 6 • Episode 2

Episode 2

Episode summary unavailable.

Season 6 • Episode 3

Episode 3

Episode summary unavailable.

Season 6 • Episode 4

Episode 4

Episode summary unavailable.

Season 6 • Episode 5

Episode 5

Episode summary unavailable.

Season 6 • Episode 6

Episode 6

Episode summary unavailable.