Lamb and Katinsky go head-to-head. Ho finds himself trapped on a train with a Russian assassin.

Lamb orders his Slow Horses to walk into traps. River believes something alarming is heading toward London.

Louisa makes her move on Pashkin. Catherine makes moves of a different kind when she plays high-stakes chess with a sinister stranger.

River gets cozy in the Cotswolds while searching for a sleeper agent. Min discovers Russian drinking games are the most brutal of all.

This quick-witted spy drama follows 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…