In Jazz Age London, a tale of a passionate and forbidden interracial romance, and the unbreakable bond between a bright young woman and her eccentric grandmother, unfolds.

Betty forfeited everything in order to care for her grandmother Arlette in their dilapidated home on the English island of Guernsey. But her will included a beneficiary unknown to her family, a woman named Clara Pickle, at a London address. Flashback to 1920s bohemian London, where Arlette De La Mare is starting her new life in a time of postwar change. Beautiful and charismatic, she is soon drawn into a hedonistic world. But when tragedy strikes, she flees back to her childhood home. Will the secrets of Arlette's past help Betty find her own way to happiness in the present?