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Young Sherlock Season 1

Season 4

Season Four follows two marriages teetering on the edge of collapse, as a single catastrophic moment obliterates the fragile peace Kate Wyler brokered between the United States and the United Kingdom and undermines the marriage she is fighting to save. As she struggles to staunch the bleeding, President Grace Penn and Vice President Hal Wyler scheme to steal Russia's most powerful weapon, driving the United States toward war. Kate and Todd—an uneasy pairing at best—join forces to thwart the Grace-Hal alliance from destabilizing the balance of power abroad and at home.

20268 EpisodesDrama, War & Politics

Cast & Crew

Bradley Whitford

Bradley Whitford

Todd Penn

Rory Kinnear

Rory Kinnear

Prime Minister Nicol Trowbridge

Allison Janney

Allison Janney

President Grace Penn

Ato Essandoh

Ato Essandoh

Stuart Hayford

Rufus Sewell

Rufus Sewell

Hal Wyler

David Gyasi

David Gyasi

Foreign Secretary Austin Dennison

Keri Russell

Keri Russell

Ambassador Kate Wyler

Nana Mensah

Nana Mensah

Billie Appiah

Ali Ahn

Ali Ahn

Eidra Park

Episode Guide

During 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.

Season 4 FAQs

The cast of Season 4 includes Bradley Whitford as Todd Penn, Rory Kinnear as Prime Minister Nicol Trowbridge, Allison Janney as President Grace Penn, Ato Essandoh as Stuart Hayford, Rufus Sewell as Hal Wyler, David Gyasi as Foreign Secretary Austin Dennison, Keri Russell as Ambassador Kate Wyler, Nana Mensah as Billie Appiah, and Ali Ahn as Eidra Park.