Long-buried Cold War secrets emerge which threaten to bring carnage to the streets of London. When a liaison with Russian villains takes a fatal turn, our hapless heroes must overcome their individual failings and raise their spy game in a race to prevent a catastrophic incident.

Brothel owner, Margaret Wells, struggles to raise her daughters in London during the 18th century.

When Detective Kat Donovan matches on a dating app with the fiancé who disappeared years before, she learns that some secrets are best left in the past.

In season five, everyone is suspicious when resident tech nerd Roddy Ho has a glamorous new girlfriend. When a series of increasingly bizarre events occur across the city, it falls to the Slow Horses to work out how everything is connected. After all, Lamb knows that in the world of espionage, the London Rules — cover your back — always apply.

A mysterious boat returns to a village 30 years after vanishing. Two men join its crew hoping for better fortune. After one voyage, they find themselves transported back in time, mistaken for the original crew.