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.

Keri Russellas Ambassador Kate Wyler
Rufus Sewellas Hal Wyler
David Gyasias Foreign Secretary Austin Dennison
Ali Ahnas Eidra Park
Rory Kinnearas Prime Minister Nicol Trowbridge
Ato Essandohas Stuart Hayford
Bradley Whitfordas Todd Penn
Allison Janneyas Grace Penn
Nana Mensahas Billie Appiah
Celia Imrieas Meg Roylin
Debora Cahn
Peter Ackerman
Marcelo Zarvos
Nathan Barr