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.

After a terrifying prophecy, Myfanwy’s desperation leads her to a place to trust in a powerful enemy. But when her plans go awry, she is forced to run for her…

Lucille must win the trust of a mother who is terrified of giving birth. Nurse Crane and Dr Turner are anxious to find a possible smallpox sufferer.

I’ve definitely seen this before on a better show. They’re always stealing ideas. But the fashion industry gotta be exposed #streetwear.

Sunny works with the River King to secure passage to Pilgrim’s Fortress. The Widow faces mutiny from discontented troops.

Sunny and Bajie go undercover on The Widow’s frontlines, seeking passage to a possible cure for Henry. Tilda confronts The Widow.

As Victor struggles to resurrect Brona, Ethan prepares to leave London and Malcolm discovers that Vanessa is plagued by new visions.

While Ferdinand helps Malcolm decipher Brother Gregory’s writings, Vanessa helps Victor pick a dress for his cousin. Meanwhile, Dorian takes Angelique on a date, and Ethan rescues a young woman…

Malcolm learns of his wife’s death but isn’t as upset as Ethan and Vanessa believe he should be. Meanwhile, Ethan asks Sembene for a favor, and Dorian sends out invitations…

While Evelyn torments Malcolm, Victor summons Ethan and Vanessa back to London to rescue their friend. Meanwhile, Brona learns Dorian’s secret, and Caliban is betrayed.

Vanessa has to use all of her strength to try and defeat the demon.