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MI5's most unruly spies are back and under attack.
Follow a dysfunctional team of MI5 agents—and their obnoxious boss, the notorious Jackson Lamb—as they navigate the espionage world's smoke and mirrors to defend England from sinister forces.
River braces for his grandfather's funeral. Lamb looks into the death of an ex–Slow Horse.
The reemergence of Frank Harkness and a suspicious string of murders put Lamb and team on high alert.
Ex–Slow Horses return to the fold as assassins close in. Taverner faces the fallout of her TV interview.
Lamb tries figuring out who Frank is working for. Sid, River, and Coe do everything to evade the hit squad.
River goes after Sid. Lamb sets his sights on Cantor. Taverner carries on with a treacherous deal.
The safe house becomes unsafe as Lamb and Taverner finally join forces.
