The Halcyon tells the story of a bustling and glamorous five star hotel at the centre of London society and a world at war.
The drama, set in 1940, shows London life through the prism of war and the impact it has on families, politics, relationships and work across every social strata - set to a soundtrack of the music of the era.
Lady Hamilton wants Freddie to use his leave from the RAF to support her with the hotel and it becomes clear she wants to make changed and that Garland is in her sights. The hotel manager insists he's not worried and that he just needs to show how indispensable he is, but Peggy and Feldman aren't so sure, while Charity meets Joe and reveals her plans for revenge, but he refuses to help her, and Emma and Betsey hit the town.
Dawn, and smoke rises from another bombed out night in London. Emma washes out the insides of a Women's Voluntary Service van with her fellow member, Evelyn. Tough, working class Evelyn remarks that in the weeks that Emma's been volunteering, she's really proved her grit. Pleased, exhausted and covered in soot, she returns to begin work all over again at the Halcyon.
In the final episode of the series, The Halcyon celebrates its 50th anniversary. Lucian struggles to keep things in order as the pressure mounts. Garland and Lady Hamilton find a cause over which they can unite - and Emma must finally make a choice.