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In season six, the Slow Horses are on the run as Diana Taverner embroils them all in a fatally high-stakes game of retaliation and revenge.
River braces for his grandfather's funeral. Lamb looks into the death of an ex–Slow Horse.
9/16/2026
The reemergence of Frank Harkness and a suspicious string of murders put Lamb and team on high alert.
9/23/2026
Ex–Slow Horses return to the fold as assassins close in. Taverner faces the fallout of her TV interview.
9/30/2026
Lamb tries figuring out who Frank is working for. Sid, River, and Coe do everything to evade the hit squad.
10/7/2026
River goes after Sid. Lamb sets his sights on Cantor. Taverner carries on with a treacherous deal.
10/14/2026
The safe house becomes unsafe as Lamb and Taverner finally join forces.
10/21/2026
