When eighteen-year-old Grace Campbell arrives in London in 1914, she's unable to fulfill her family's ambitions and find a position as an office secretary. Lying to her parents and her brother, Michael, she takes a job as a housemaid at Number 35, Park Lane, where she is quickly caught up in lives of its inhabitants-in particular, those of its privileged son, Edward, and daughter, Beatrice, who is recovering from a failed relationship that would have taken her away from an increasingly stifling life. Desperate to find a new purpose, Bea joins a group of radical suffragettes and strikes up an intriguing romance with an impassioned young lawyer. Unbeknownst to each of the young women, the choices they make amid the rapidly changing world of World War I will connect their chances at future happiness in dramatic and inevitable ways.