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 returns to CIA. Tara travels abroad. Edwards digs deeper. Doug has nightmares.
Bentley searches for answers. Edwards meets an asset. Doug gets a visitor. Soyun gets a mission.
