London, 1940. The Halcyon, a luxurious five-star hotel, is the epicenter of high society and glamour, but the world outside its doors is on the brink of war. As the hotel's staff and guests navigate their way through the tumultuous era, they must confront their own secrets, scandals, and loyalties. The series takes us on a journey through the prism of war, revealing how it impacts families, politics, relationships, and work across every social strata, all set to the soundtrack of the era's iconic music.

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Some TV shows that have similar genres and were produced around the same time as The Halcyon include Shōgun, Fallout, The Looming Tower, Masters of the Air, Band of Brothers, All the Light We Cannot See.