The Diplomat · S4E1

Windsor

October 15, 2026

On an unplanned stopover at Windsor Castle, Kate grows wary of Hal and Grace's dynamic as she tries to contain the fallout from their covert actions.

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Rosaline Elbay

Nora Koriem

Aidan Turner

Callum Ellis

Keri Russell

Ambassador Kate Wyler

Rufus Sewell

Hal Wyler

David Gyasi

Foreign Secretary Austin Dennison

Ali Ahn

Eidra Park

Rory Kinnear

Prime Minister Nicol Trowbridge

Ato Essandoh

Stuart Hayford

Season concluded. The show will return with new episodes, air date to be announced.

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