No alliance lasts forever.
Amid an international crisis, a US diplomat contends with her high-profile job as ambassador to the UK and her strained marriage to a political star.
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Keri RussellAmbassador Kate Wyler
Rufus SewellHal Wyler
Ali AhnEidra Park
Rory KinnearPrime Minister Nicol Trowbridge
Ato EssandohStuart Hayford
Bradley WhitfordTodd Penn
Allison JanneyGrace Penn
Nana MensahBillie Appiah