In 1910 London, Katharine Hilbery, a fiercely independent woman, challenges her family's traditional views by choosing to follow her passion for astronomy instead of conforming to societal expectations of marriage. When her father pressures her into an unwelcome engagement, her determination is put to the test. As she forms new friendships—among them a courageous suffragette and a reflective editor—Katharine starts to question the constraints imposed by society, love, and convention. Her journey becomes one of self-discovery, as she seeks to carve out a future that is authentically hers.