River gets cozy in the Cotswolds while searching for a sleeper agent. Min discovers Russian drinking games are the most brutal of all.
Louisa makes her move on Pashkin. Catherine makes moves of a different kind when she plays high-stakes chess with a sinister stranger.
Lamb orders his Slow Horses to walk into traps. River believes something alarming is heading toward London.
Lamb and Katinsky go head-to-head. Ho finds himself trapped on a train with a Russian assassin.
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.
Bentley searches for answers. Edwards meets an asset. Doug gets a visitor. Soyun gets a mission.
Bentley returns to CIA. Tara travels abroad. Edwards digs deeper. Doug has nightmares.
