It's the dawn of the 1930s, and the three privileged Guinness sisters settle into becoming wives and mothers. But while Britain becomes increasingly politically polarized, Aileen, Maureen and Oonagh discover conflict within their own marriages. Oonagh's dream of romantic love is countered by her husband's lies; the intense nature of Maureen's marriage means passion, but also rows; and Aileen begins to discover that, for her, being married offers far less than she had expected. Meanwhile, Kathleen, a housemaid from their childhood home in Glenmaroon, travels between the three sisters, helping, listening and watching --- even as her own life brings her into conflict with the clash between fascism and communism.

Descendants of the founder of the Guinness beer empire, they were the toast of 1920s high society, darlings of the press, with not a care in the world. But Felicity knows better. Sent to live with them as a child because her mother could no longer care for her, she grows up as the sisters’ companion. Both an outsider and a part of the family, she witnesses the complex lives upstairs and downstairs, sees the compromises and sacrifices beneath the glamorous surface. Then, at a party one summer’s evening, something happens that sends shock waves through the entire household.